{"title":"Immersion Heaters – Elements, Thermostats \u0026 Accessories","description":"\u003cp dir=\"ltr\"\u003eWhether you're replacing a failed element in an existing hot water cylinder or specifying immersion heating for a new installation, getting the right combination of element material, length, boss thread and thermostat type is what determines whether the job lasts five years or twenty. Our range covers copper, Incoloy and titanium immersion heaters from Tesla UK and OSO Hotwater, alongside compatible thermostats, thermostat pockets and box spanner keys.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eChoosing the right element material\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eElement material is matched to water hardness, not personal preference:\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper\u003c\/strong\u003e — the standard choice for soft to moderately hard water areas and general domestic use. Cost-effective and widely compatible, but prone to accelerated scale build-up and reduced service life in hard water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncoloy\u003c\/strong\u003e — a nickel-chromium alloy sheath offering improved resistance to limescale and pitting corrosion versus copper. The recommended minimum specification for moderate to hard water areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitanium\u003c\/strong\u003e — the most corrosion- and scale-resistant option, advised for hard to very hard water areas, for cylinders that rely on the immersion as the sole or primary heat source (rather than boiler\/heat pump backup), and for high-use settings such as HMOs and student accommodation where element life under continuous cycling matters most.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003eA critical compatibility point often missed at spec stage: \u003cstrong\u003ethermostat pocket material must match the cylinder material\u003c\/strong\u003e. Fitting a copper thermostat pocket into a stainless steel cylinder creates a galvanic couple between dissimilar metals, driving electrolytic corrosion at the pocket. Stainless steel cylinders require an Incoloy or stainless steel thermostat pocket — never copper. Always check the cylinder manufacturer's spec before ordering.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eGetting the length and thread right\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eImmersion heaters are sized by \u003cstrong\u003eelement length in inches\u003c\/strong\u003e — common lengths in our range include 11\", 14\", 18\" and 27\" — and fitted via a threaded brass boss, typically \u003cstrong\u003e2¼\"\u003c\/strong\u003e as standard, with \u003cstrong\u003e1¼\"\u003c\/strong\u003e and \u003cstrong\u003e1¾\"\u003c\/strong\u003e variants used on some OSO cylinders. Length and thread must match the original unit exactly; a mismatched length won't seat correctly in the tank, and a mismatched thread won't engage the boss. If you're unsure of your existing spec, the length and thread size are usually stamped on the immersion boss itself or listed in the cylinder manufacturer's spares documentation.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eOne length worth noting: shorter elements built with a denser coil (rather than a single straight run) can offer the effective heating surface area of a much longer standard element while fitting a shallower cylinder — useful where cylinder height is constrained.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eRating and installation basics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003eStandard domestic immersion heaters are rated \u003cstrong\u003e3kW at 240V\u003c\/strong\u003e, drawing roughly 13A — install on a dedicated 16A circuit as standard practice.\u003c\/li\u003e\n\u003cli\u003eHigher-output single and twin-element configurations (commonly up to 4.5kW+ per element, or dual 3kW+3kW arrangements) are used where the immersion serves as primary heating rather than backup, and may need a dedicated 20A+ circuit — confirm against the manufacturer's electrical spec.\u003c\/li\u003e\n\u003cli\u003eAll units in this range are manufactured to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e and are \u003cstrong\u003eBEAB approved\u003c\/strong\u003e, with an integral dual safety thermostat (operating + high-limit cut-out) as standard.\u003c\/li\u003e\n\u003cli\u003eUnvented cylinder installations fall under \u003cstrong\u003ePart G of the Building Regulations\u003c\/strong\u003e and must be carried out or signed off by a \u003cstrong\u003eG3-qualified engineer\u003c\/strong\u003e — this applies to the whole cylinder system, not just the immersion element.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eExtending element life\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eRegardless of material, a few practices reduce scale-related failure: fit the shortest element length that suits the cylinder rather than defaulting to the longest available, set the cylinder thermostat no higher than necessary, and avoid running the immersion continuously where a boiler or heat pump can share the load. Running an element without full water coverage — for example during draindown or a low-water fault — can anneal and split the sheath, which is a common cause of premature failure unrelated to water hardness.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eAccessories in this range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement thermostats\u003c\/strong\u003e — rod and standard pattern, matched to element type and cylinder material.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat pockets\u003c\/strong\u003e — copper, Incoloy and stainless steel, selected to match cylinder material and avoid galvanic corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBox spanner keys\u003c\/strong\u003e — sized to the immersion boss for safe removal and installation without damaging the boss or element sheath.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eRelated collections:\u003c\/strong\u003e \u003ca href=\"https:\/\/qualityheating.co.uk\/collections\/direct-unvented-cylinders\"\u003eDirect Unvented Cylinders\u003c\/a\u003e · \u003ca href=\"https:\/\/qualityheating.co.uk\/collections\/solar-immersion-controllers\"\u003eSolar Immersion Controllers\u003c\/a\u003e · \u003ca href=\"https:\/\/qualityheating.co.uk\/blogs\/learn-more\/qh-electric-water-heaters-storage-tanks-for-uk-homes-caravans\"\u003eElectric Water Heaters\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"14-inch-incoloy-unvented-immersion-heater-3kw-1-3-4-inch-boss-with-thermostat-tih476pi","title":"14 inch Incoloy Unvented Immersion Heater 3kW 1.3\/4 inch Boss with Thermostat - TIH476PI","description":"\u003c!-- SEO Product Name: Tesla 14 inch Incoloy Unvented Immersion Heater 3kW 1.3\/4 inch Boss with Thermostat - MPN TIH476PI --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe Tesla UK \u003cstrong\u003e14\" Incoloy Unvented Immersion Heater\u003c\/strong\u003e (MPN \u003cstrong\u003eTIH476PI\u003c\/strong\u003e) is a \u003cstrong\u003e3kW, 240V\u003c\/strong\u003e element purpose-built for unvented hot water cylinders, using the \u003cstrong\u003e1-3\/4\" BSP\u003c\/strong\u003e boss common to sealed unvented systems rather than the standard 2-1\/4\" domestic boss. It is supplied complete with a \u003cstrong\u003ethermostat\u003c\/strong\u003e and an \u003cstrong\u003eO-ring seal\u003c\/strong\u003e, ready to fit.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eManufactured in \u003cstrong\u003eIncoloy\u003c\/strong\u003e, this heater is recommended for \u003cstrong\u003emedium-to-hard water areas\u003c\/strong\u003e and is suitable for use in both standard unvented cylinders and \u003cstrong\u003estainless steel unvented cylinders\u003c\/strong\u003e. It is approved to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e, \u003cstrong\u003eBEAB approved\u003c\/strong\u003e, and CE marked.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e14\"\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eElement Length\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eIncoloy\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eElement Material\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e1-3\/4\" BSP\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBoss Size\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e3kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003ePower @ 240V\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eBEAB\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eApproved\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eEN 60335-2-73\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eApproval Standard\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #e0942a;\"\u003ePlease Note:\u003c\/strong\u003e This heater uses the \u003cstrong\u003e1-3\/4\" BSP unvented boss\u003c\/strong\u003e, not the more common 2-1\/4\" domestic boss. Confirm your cylinder's existing thread size before ordering, as the two boss sizes are not interchangeable without a separate adaptor.\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eIncoloy Element for Medium-to-Hard Water\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003e\n\u003cstrong\u003eIncoloy\u003c\/strong\u003e is the manufacturer-recommended material for medium-to-hard water areas, offering improved scale resistance over a plain copper element for longer service life.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eSupplied Complete with Thermostat\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eThis heater is supplied complete with a \u003cstrong\u003ethermostat\u003c\/strong\u003e and a \u003cstrong\u003eWRAS-approved O-ring seal\u003c\/strong\u003e, so no separate thermostat needs to be sourced for installation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eSuitable for Stainless Steel Unvented Cylinders\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eDesigned to be \u003cstrong\u003esuitable for use in unvented stainless steel cylinders\u003c\/strong\u003e as well as standard unvented cylinders, without the galvanic corrosion risk associated with copper-pocket elements.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eBEAB Approved \u0026amp; CE Marked\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eManufactured to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e and \u003cstrong\u003eBEAB approved\u003c\/strong\u003e, with full \u003cstrong\u003eCE marking\u003c\/strong\u003e, confirming compliance with UK and European electrical safety standards.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003e1-3\/4\" Boss for Sealed Unvented Systems\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eUses the \u003cstrong\u003e1-3\/4\" BSP boss\u003c\/strong\u003e specified for many sealed unvented cylinder systems, distinct from the standard 2-1\/4\" domestic boss used elsewhere in the Tesla range.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eHorizontal Mounting\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eAt 14\" (355mm) in length, this heater is designed for \u003cstrong\u003ehorizontal fitting\u003c\/strong\u003e, in line with Tesla's general guidance that heaters of 14\" or shorter mount horizontally.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial,Helvetica,sans-serif;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eGeneral Specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eTesla UK Ltd, Sutton Coldfield, West Midlands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eMPN\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eTIH476PI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eElement Length\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e14\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eElement Material\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eIncoloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eBoss Size\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e1-3\/4\" BSP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003ePower Rating\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e3kW @ 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eCylinder Type\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eUnvented, including stainless steel unvented cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eApproval Standard\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eEN 60335-2-73 (BS EN 60335-2-73)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSafety Certification\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eBEAB Approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eOther Certification\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eCE Marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSealing\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eO-ring, included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eRecommended Water Hardness\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eMedium to hard water areas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eMounting Orientation\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eHorizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e1 year manufacturer guarantee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FDECEC; border-left: 4px solid #D32F2F; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #d32f2f;\"\u003eImportant Safety Information:\u003c\/strong\u003e This is a mains-voltage electrical heating product for installation into a water-filled cylinder. It is a \u003cstrong\u003elegal requirement under Part P\u003c\/strong\u003e of the Building Regulations that this unit is fitted by a competent, suitably qualified person, with the installation compliant with all local and national rules and current IEE wiring regulations (BS 7671). The appliance must be earthed and wired through a double-pole isolator with a contact separation of at least 3mm in all poles. The heater must never be switched on unless fully immersed in water.\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat water hardness is this heater suitable for?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThis Incoloy element is recommended by the manufacturer for \u003cstrong\u003emedium-to-hard water areas\u003c\/strong\u003e. For hard-to-very-hard water, a Titanium element would offer longer service life.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eCan this be used in a stainless steel cylinder?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes — this heater is specifically \u003cstrong\u003esuitable for use in unvented stainless steel cylinders\u003c\/strong\u003e, as well as standard unvented cylinders.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eDoes this heater include a thermostat?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes, it is supplied \u003cstrong\u003ecomplete with a thermostat\u003c\/strong\u003e and a WRAS-approved O-ring seal, ready to install.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat boss size does this heater use?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThis variant uses a \u003cstrong\u003e1-3\/4\" BSP boss\u003c\/strong\u003e, which is specified for many sealed unvented cylinder systems, rather than the more common 2-1\/4\" domestic boss.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eShould this be fitted horizontally or vertically?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eAt 14\" in length, this heater is designed for \u003cstrong\u003ehorizontal fitting\u003c\/strong\u003e, following Tesla's general guidance that heaters 14\" (355mm) or shorter mount horizontally.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat approvals does this heater carry?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eIt is manufactured to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e, is \u003cstrong\u003eBEAB approved\u003c\/strong\u003e, and carries full \u003cstrong\u003eCE marking\u003c\/strong\u003e, confirming compliance with UK and European electrical safety requirements.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Tesla UK","offers":[{"title":"Default Title","offer_id":65644415058269,"sku":"TIH476PI","price":33.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/14inchIncoloyUnventedImmersionHeater3kWwithThermostat-TIH476PI.jpg?v=1787293235"},{"product_id":"oso-standard-immersion-heater-1-1-4-inch-3kw-240v-with-built-in-thermostat-mpn-8015192-replaces-71259-71255","title":"OSO Standard Immersion Heater 1.1\/4 inch 3kW 240V with Built-In Thermostat - MPN 8015192, Replaces 71259 71255","description":"\u003c!-- SEO Product Name: OSO Standard Immersion Heater 1.1\/4 inch 3kW 240V with Built-In Thermostat - MPN 8015192, Replaces 71259 71255 --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe \u003cstrong\u003eOSO Standard Immersion Heater\u003c\/strong\u003e (product code 8015192) is a genuine OSO Hotwater replacement immersion element rated \u003cstrong\u003e3kW at 240V\u003c\/strong\u003e, fitted with a \u003cstrong\u003ebuilt-in working thermostat\u003c\/strong\u003e as standard. It uses OSO's \u003cstrong\u003enon-standard 1-1\/4\" boss\u003c\/strong\u003e, so a 50mm box spanner is recommended for installation rather than a standard immersion spanner.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThis is a direct replacement for the earlier OSO codes \u003cstrong\u003e71259 and 71255\u003c\/strong\u003e, and is compatible across the majority of the OSO Hotwater cylinder range, including the 20 Series, 16 Series, Twincoil, Solarcyl, Ecoline, and Geo ranges.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e3kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003ePower @ 240V\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e1-1\/4\"\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBoss Size (Non-Standard)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eBuilt-In\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eThermostat Type\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e40-70°C\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eThermostat Range\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e85°C ±3°C\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eSafety Cut-Out\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e50mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBox Spanner Size\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #e0942a;\"\u003ePlease Note:\u003c\/strong\u003e OSO immersion heaters use a \u003cstrong\u003enon-standard 1-1\/4\" boss\u003c\/strong\u003e, unlike the more common 2-1\/4\" BSP boss found on most UK domestic cylinders. A \u003cstrong\u003e50mm box spanner\u003c\/strong\u003e is recommended for installation and removal — a standard immersion spanner will not fit.\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eBuilt-In Working Thermostat\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eUnlike the rod\/smart-thermostat variant, this heater is supplied with its \u003cstrong\u003ethermostat factory-fitted internally\u003c\/strong\u003e, adjustable between 40°C and 70°C, with no separate thermostat to source or fit.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eIntegrated Safety Cut-Out\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eA safety cut-out is built into the thermostat assembly and \u003cstrong\u003eoperates at 85°C ±3°C\u003c\/strong\u003e, protecting the cylinder against overheating independently of the main temperature control.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eDirect Replacement for Earlier OSO Codes\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eThis part directly \u003cstrong\u003ereplaces OSO codes 71259 and 71255\u003c\/strong\u003e, making it a straightforward like-for-like replacement on older OSO cylinders still fitted with those earlier elements.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eWide OSO Cylinder Compatibility\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eConfirmed compatible with the \u003cstrong\u003e20 Series, 16 Series, Twincoil, Solarcyl, Ecoline and Geo200\/250\/300\u003c\/strong\u003e ranges, plus specific 20RI\/20RD combination models (20RI250F1, 20RI300F1, 20RI380F1, 20RI200TC, 20RI250TC, 20RI399TC, and more).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eFactory-Mounted Internal Wiring\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eAll internal wiring on the OSO immersion assembly is \u003cstrong\u003efactory mounted\u003c\/strong\u003e, simplifying installation and reducing on-site wiring error.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eEconomy 7 Compatible\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eWhere a cylinder has upper and lower immersion positions, the \u003cstrong\u003elower heater can be run on an off-peak tariff\u003c\/strong\u003e while the upper heater runs on the day tariff, connected via a suitable water heater controller.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial,Helvetica,sans-serif;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eGeneral Specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eOSO Hotwater (UK) Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eOSO Product Code\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e8015192\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eReplaces\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e71259, 71255\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003ePower Rating\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e3kW @ 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eBoss Size\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e1-1\/4\" (non-standard OSO boss)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Type\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eBuilt-in, factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Range\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e40°C to 70°C, adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSafety Cut-Out\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e85°C ±3°C, integrated within the thermostat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eRecommended Tool\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e50mm box spanner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eElectrical Connection\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eDouble-pole linked switch, minimum break capacity 13A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eCylinder Compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSeries\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e20 Series, 16 Series, Twincoil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSpecific Models\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e20RI250F1, 20RI300F1, 20RI380F1, 20RI200TC, 20RI250TC, 20RI399TC, 20RI380TC, 20RI250SD, 20RI300SD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eOther Ranges\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eGEO200, GEO250, GEO300, Solarcyl, Ecoline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FDECEC; border-left: 4px solid #D32F2F; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #d32f2f;\"\u003eImportant Safety Information:\u003c\/strong\u003e This is a mains-voltage electrical heating product for installation into a water-filled cylinder. Installation, wiring and testing \u003cstrong\u003emust be carried out by a suitably qualified electrician\u003c\/strong\u003e or a Part P registered competent person, in accordance with current IEE wiring regulations (BS 7671). The appliance must be permanently connected to the electrical supply through a double-pole linked switch with a minimum break capacity of 13A. The heater must never be switched on unless fully immersed in water.\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eDoes this heater come with a thermostat already fitted?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes. This variant (8015192) has a \u003cstrong\u003ebuilt-in working thermostat\u003c\/strong\u003e, adjustable between 40°C and 70°C, already factory-fitted — there is no separate thermostat to buy or install.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat size spanner do I need to fit or remove this heater?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eOSO immersion heaters use a \u003cstrong\u003enon-standard 1-1\/4\" boss\u003c\/strong\u003e. A \u003cstrong\u003e50mm box spanner\u003c\/strong\u003e is recommended, as a standard immersion spanner will not fit this boss size.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhich OSO cylinders is this heater compatible with?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eIt is compatible with the \u003cstrong\u003e20 Series, 16 Series, Twincoil, Solarcyl and Ecoline\u003c\/strong\u003e ranges, the \u003cstrong\u003eGEO200\/250\/300\u003c\/strong\u003e models, and specific 20RI\/20RD combination models including 20RI250F1, 20RI300F1 and 20RI380F1.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eIs this a direct replacement for my older OSO immersion heater?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes, if your existing heater is coded \u003cstrong\u003e71259 or 71255\u003c\/strong\u003e, this part (8015192) is the current direct replacement.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat happens if the safety cut-out trips?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe integrated safety cut-out operates at \u003cstrong\u003e85°C ±3°C\u003c\/strong\u003e. Before resetting it or adjusting the thermostat setting, always \u003cstrong\u003eisolate the electrical supply\u003c\/strong\u003e to the unit first, in line with the manufacturer's installation instructions.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":65644458836317,"sku":"8015192","price":143.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSO3kwImmersionHeater8015192.jpg?v=1787293575"},{"product_id":"oso-immersion-heater-with-thermostat-pocket-1-1-4-inch-3kw-240v-for-rod-or-smart-thermostat-71252-replaces-71248-sx-iq-compatible","title":"OSO Immersion Heater with Thermostat Pocket 1.1\/4 inch 3kW 240V For Rod or Smart Thermostat - 72091, Replaces 71252, 71248, SX-IQ Compatible","description":"\u003c!-- SEO Product Name: OSO Immersion Heater with Thermostat Pocket 1.1\/4 inch 3kW 240V For Rod or Smart Thermostat - MPN 72091, Replaces 71248 71252, SX-IQ Compatible --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe \u003cstrong\u003eOSO Immersion Heater with Pocket\u003c\/strong\u003e (current product code \u003cstrong\u003e72091\u003c\/strong\u003e) is a genuine OSO Hotwater replacement element rated \u003cstrong\u003e3kW at 240V\u003c\/strong\u003e, supplied \u003cstrong\u003ewithout a built-in thermostat\u003c\/strong\u003e. Instead, it is fitted with a \u003cstrong\u003ethermostat pocket\u003c\/strong\u003e, designed for use with a separate rod or smart thermostat fitted into the pocket after installation.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThis variant is specifically intended for the \u003cstrong\u003eOSO SX-IQ\u003c\/strong\u003e cylinder range. It is the current replacement for the earlier OSO code \u003cstrong\u003e71248\u003c\/strong\u003e, and supersedes the now-discontinued interim code \u003cstrong\u003e71252\u003c\/strong\u003e. It shares the same \u003cstrong\u003e1-1\/4\" non-standard OSO boss\u003c\/strong\u003e as the standard built-in-thermostat heater, so the same 50mm box spanner is required for installation.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e3kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003ePower @ 240V\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e1-1\/4\"\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBoss Size (Non-Standard)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003ePocket\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eThermostat Type\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eRod or Smart\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eThermostat Compatibility\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eSX-IQ\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003ePrimary Cylinder Compatibility\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e50mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBox Spanner Size\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #e0942a;\"\u003ePlease Note:\u003c\/strong\u003e This heater does \u003cstrong\u003enot\u003c\/strong\u003e include a thermostat. It is supplied with a thermostat \u003cstrong\u003epocket only\u003c\/strong\u003e, and a separate rod or smart thermostat must be fitted into the pocket to complete the installation. Confirm which thermostat your OSO SX-IQ cylinder requires before ordering.\u003c\/div\u003e\n\u003cdiv style=\"background: #E6F4F3; border-left: 4px solid #008377CF; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eGood to Know:\u003c\/strong\u003e OSO Product Code \u003cstrong\u003e72091\u003c\/strong\u003e is the current listing for this part on the manufacturer's own spares site. The interim code \u003cstrong\u003e71252\u003c\/strong\u003e, which previously covered this same specification, has since been discontinued.\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eThermostat Pocket for Rod or Smart Thermostats\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eRather than a built-in thermostat, this element has a \u003cstrong\u003ededicated pocket\u003c\/strong\u003e allowing either a conventional rod thermostat or a compatible smart thermostat to be fitted, giving flexibility over temperature control method.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003ePurpose-Built for OSO SX-IQ Cylinders\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eThis part is specifically designed and listed as \u003cstrong\u003ecompatible with the OSO SX-IQ\u003c\/strong\u003e cylinder range, distinguishing it from the standard built-in-thermostat element used across other OSO series.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eDirect Replacement for Code 71248\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eThis part directly \u003cstrong\u003ereplaces OSO code 71248\u003c\/strong\u003e, making it the current specification for like-for-like replacement on SX-IQ cylinders originally fitted with that earlier element. It also supersedes the discontinued interim code \u003cstrong\u003e71252\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eSame Non-Standard 1-1\/4\" Boss\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eUses the same \u003cstrong\u003e1-1\/4\" non-standard OSO boss\u003c\/strong\u003e as the rest of the OSO immersion heater range, requiring a \u003cstrong\u003e50mm box spanner\u003c\/strong\u003e for installation or removal.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003e3kW Output at 240V\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eRated at \u003cstrong\u003e3kW, 240V\u003c\/strong\u003e, matching the power output of OSO's standard built-in-thermostat immersion heater, so heat-up performance is unaffected by the choice of pocket-mounted thermostat.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial,Helvetica,sans-serif;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eGeneral Specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eOSO Hotwater (UK) Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eOSO Product Code\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e72091\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eReplaces\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e71248 (also supersedes discontinued interim code 71252)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003ePower Rating\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e3kW @ 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eBoss Size\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e1-1\/4\" (non-standard OSO boss)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Type\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003ePocket only — for separate rod or smart thermostat (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eRecommended Tool\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e50mm box spanner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eElectrical Connection\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eDouble-pole linked switch, minimum break capacity 13A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eCylinder Compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003ePrimary Compatibility\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eOSO SX-IQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FDECEC; border-left: 4px solid #D32F2F; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #d32f2f;\"\u003eImportant Safety Information:\u003c\/strong\u003e This is a mains-voltage electrical heating product for installation into a water-filled cylinder. Installation, wiring and testing \u003cstrong\u003emust be carried out by a suitably qualified electrician\u003c\/strong\u003e or a Part P registered competent person, in accordance with current IEE wiring regulations (BS 7671). The appliance must be permanently connected to the electrical supply through a double-pole linked switch with a minimum break capacity of 13A. As this heater has no built-in thermostat, a suitable rod or smart thermostat \u003cstrong\u003emust be fitted into the pocket before the heater is energised\u003c\/strong\u003e. The heater must never be switched on unless fully immersed in water.\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eDoes this immersion heater include a thermostat?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eNo. This variant (71252) is supplied with a \u003cstrong\u003ethermostat pocket only\u003c\/strong\u003e. A separate rod or smart thermostat must be fitted into the pocket to control water temperature and provide safety cut-out protection.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat is the difference between this and the standard OSO immersion heater (8015192)?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe standard heater (8015192) has a \u003cstrong\u003ebuilt-in thermostat\u003c\/strong\u003e factory-fitted inside the element. This variant (72091) instead has an \u003cstrong\u003eempty pocket\u003c\/strong\u003e, designed so a rod or smart thermostat can be fitted separately — typically to enable smart\/WiFi temperature control on an OSO SX-IQ cylinder.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhich OSO cylinder is this designed for?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThis part is specifically listed as compatible with the \u003cstrong\u003eOSO SX-IQ\u003c\/strong\u003e cylinder range.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat size spanner do I need to fit this heater?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eLike other OSO immersion heaters, this uses a \u003cstrong\u003enon-standard 1-1\/4\" boss\u003c\/strong\u003e, and a \u003cstrong\u003e50mm box spanner\u003c\/strong\u003e is recommended for installation and removal.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eIs this a direct replacement for an older OSO part?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes — this part (72091) directly \u003cstrong\u003ereplaces OSO code 71248\u003c\/strong\u003e, and also supersedes the discontinued interim code \u003cstrong\u003e71252\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":65644530827613,"sku":"72091","price":147.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOImmersionHeaterwithThermostatPocket72091.jpg?v=1787294053"},{"product_id":"incoloy-immersion-heaters-2-1-4-inch-bsp-with-copper-thermostat-pocket-3kw-240v-11-to-36-inch","title":"Incoloy Immersion Heaters 2.1\/4 inch BSP with Copper Thermostat Pocket - 3kW 240V, 11 to 36 inch","description":"\u003c!-- SEO Product Name: Tesla Incoloy Immersion Heater 2.1\/4 inch BSP with Copper Thermostat Pocket - 3kW 240V, 11 to 36 inch, TIH540 TIH545 TIH547 TIH548 TIH550 TIH555 TIH560 --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe Tesla UK \u003cstrong\u003eIncoloy Immersion Heater with Copper Thermostat Pocket\u003c\/strong\u003e is the mid-range option in the Tesla domestic heater line-up, recommended for \u003cstrong\u003emoderate to hard water areas\u003c\/strong\u003e where a plain copper element would scale up too quickly but a full titanium element is not required. It uses a standard \u003cstrong\u003e2-1\/4\" BSP\u003c\/strong\u003e boss and is rated \u003cstrong\u003e3kW at 240V\u003c\/strong\u003e across the full length range.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThis variant is supplied complete with a \u003cstrong\u003edual safety thermostat\u003c\/strong\u003e matched to the element length, a sealing washer, and full fitting instructions. It is manufactured to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e and \u003cstrong\u003eBEAB approved\u003c\/strong\u003e (Certificate No. 21089), with \u003cstrong\u003eKiwa\u003c\/strong\u003e water regulations approval. Select the correct length below (11\" to 36\") to match your existing cylinder boss and thermostat pocket depth.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eIncoloy\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eElement Material\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eCopper\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eThermostat Pocket\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e2-1\/4\" BSP\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eBoss Size\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003e3kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003ePower @ 240V\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eBEAB\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eCertified No. 21089\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 8px; padding: 14px 10px; text-align: center; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #008377cf;\"\u003eKiwa\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #555; margin-top: 4px; text-transform: uppercase; letter-spacing: .04em;\"\u003eWater Regs Approved\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #e0942a;\"\u003ePlease Note:\u003c\/strong\u003e The thermostat pocket on this variant is \u003cstrong\u003ecopper\u003c\/strong\u003e, not Incoloy or titanium. Tesla recommends against fitting copper-pocket elements into stainless steel cylinders, as galvanic corrosion can eventually perforate the pocket. For stainless steel cylinders, choose the Incoloy-with-Incoloy-pocket or Titanium variant instead.\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; margin: 0 -4px 20px -4px;\"\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eIncoloy Element for Moderate-to-Hard Water\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003e\n\u003cstrong\u003eIncoloy\u003c\/strong\u003e is the manufacturer-recommended material for moderate to hard water areas, offering better scale resistance than a plain copper element while remaining more cost-effective than titanium.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eDual Safety Thermostat Included\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eEvery length is supplied complete with a \u003cstrong\u003ecombined thermostat and safety over-temperature cut-out\u003c\/strong\u003e, factory pre-set to 60°C with an 85°C manual-reset cut-out.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eThermostat Length Matched to Element\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eStem length increases with element length — \u003cstrong\u003e7\"\u003c\/strong\u003e for 11\"-14\" models, \u003cstrong\u003e11\"\u003c\/strong\u003e for 18\"-23\", and \u003cstrong\u003e18\"\u003c\/strong\u003e for 27\"-36\" — ensuring accurate temperature sensing depth in every size.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eBEAB \u0026amp; Kiwa Approved Throughout\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eManufactured to \u003cstrong\u003eEN 60335-2-73\u003c\/strong\u003e and BEAB approved (Certificate No. 21089), with \u003cstrong\u003eKiwa\u003c\/strong\u003e water regulations approval and a non-asbestos gasket or WRAS-approved seal as applicable.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eSeven Lengths to Match Every Cylinder\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eAvailable from \u003cstrong\u003e11\" up to 36\"\u003c\/strong\u003e, covering combination cylinders through to the largest 42\" x 18\" domestic cylinders, all sharing the same 2-1\/4\" BSP boss.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px; margin: 4px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #00625d; margin-bottom: 6px;\"\u003eVertical or Horizontal Mounting\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; line-height: 1.55;\"\u003eLengths of \u003cstrong\u003e14\" or shorter mount horizontally\u003c\/strong\u003e; lengths over 14\" are designed for \u003cstrong\u003evertical, top-entry fitting\u003c\/strong\u003e, with approximately 60mm clearance required at the element tip.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial,Helvetica,sans-serif;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eGeneral Specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eTesla UK Ltd, Sutton Coldfield, West Midlands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eElement Material\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eIncoloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Pocket Material\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eCopper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eBoss Size\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003ePower Rating\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e3kW @ 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eApproval Standard\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eEN 60335-2-73 (BS EN 60335-2-73)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSafety Certification\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eBEAB Approved, Certificate No. 21089\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eWater Regulations\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eKiwa approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Type\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eCombined dual safety thermostat with manual-reset over-temperature cut-out\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eThermostat Pre-set\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e60°C (adjustable, cut-out at 85°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eSealing\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eNon-asbestos gasket or WRAS-approved ‘O’ ring, as applicable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eCable Rating\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eMinimum 1.5mm² heat-resistant cable required (installer-supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eMax System Temperature\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e75°C (per BS699 \/ BS1566 \/ BS3198 domestic hot water systems)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eRecommended Water Hardness\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eModerate to hard water areas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase;\"\u003eInstallation Guidance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eCombination Cylinders\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e11\", 14\" or 18\" recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003e36\" x 18\" Cylinders\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e23\" or 27\" recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003e42\" x 18\" Cylinders\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e27\", 30\" or 36\" recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eMounting Orientation\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003e14\" or shorter: horizontal. Over 14\": vertical (top-entry)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eClearance\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eApprox. 60mm clearance required between element end and cylinder wall\/base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 44%; border-bottom: 1px solid #D9EDEA;\"\u003eStainless Steel Cylinders\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #D9EDEA;\"\u003eNot recommended due to copper thermostat pocket — choose an Incoloy or Titanium pocket variant instead\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-family: Arial,Helvetica,sans-serif;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background: #008377CF; color: #fff; padding: 9px 12px; font-size: 13px; text-align: left; white-space: nowrap;\"\u003eLength\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; padding: 9px 12px; font-size: 13px; text-align: left; white-space: nowrap;\"\u003eBoss\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; padding: 9px 12px; font-size: 13px; text-align: left; white-space: nowrap;\"\u003ekW @ 240V\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; padding: 9px 12px; font-size: 13px; text-align: left; white-space: nowrap;\"\u003eThermostat Length\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; padding: 9px 12px; font-size: 13px; text-align: left; white-space: nowrap;\"\u003eMPN\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e11\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e7\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH540\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e14\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e7\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH545\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e18\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e11\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH547\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e23\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e11\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH548\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e27\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e18\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e30\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e18\"\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH555\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e36\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e2-1\/4\" BSP\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e3\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003e18\"\u003c\/td\u003e\n\u003ctd style=\"background: #F7FAFA; padding: 8px 12px; font-size: 13.5px; color: #222; border-bottom: 1px solid #D9EDEA; white-space: nowrap;\"\u003eTIH560\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FDECEC; border-left: 4px solid #D32F2F; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 0 0 18px 0; font-size: 15px; color: #2b2b2b;\"\u003e\n\u003cstrong style=\"color: #d32f2f;\"\u003eImportant Safety Information:\u003c\/strong\u003e This is a mains-voltage electrical heating product for installation into a water-filled cylinder. Installation, wiring and testing \u003cstrong\u003emust be carried out by a suitably qualified electrician\u003c\/strong\u003e or a Part P registered competent person, in accordance with current IEE wiring regulations. The appliance must be earthed and wired through a double-pole isolator with a contact separation of at least 3mm in all poles. The heater must never be switched on unless fully immersed in water.\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhat water hardness is this Incoloy element suitable for?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThis variant is recommended by the manufacturer for \u003cstrong\u003emoderate to hard water areas\u003c\/strong\u003e. For hard to very hard water, a Titanium element is advised for longer service life.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eWhy does the thermostat pocket matter?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe thermostat pocket is the sealed tube the thermostat sensing rod sits inside. This variant uses a \u003cstrong\u003ecopper pocket\u003c\/strong\u003e, which is suitable for standard copper cylinders but not recommended for stainless steel cylinders due to the risk of galvanic corrosion.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eHow do I choose the right length for my cylinder?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eAs a guide: \u003cstrong\u003ecombination cylinders\u003c\/strong\u003e generally take 11\", 14\" or 18\" models; \u003cstrong\u003e36\" x 18\" cylinders\u003c\/strong\u003e typically take 23\" or 27\"; and \u003cstrong\u003e42\" x 18\" cylinders\u003c\/strong\u003e take 27\", 30\" or 36\". Always use the largest length your cylinder can accommodate for the most efficient heat cycle.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eDoes this heater include a thermostat?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes. Every length is supplied complete with a \u003cstrong\u003edual safety thermostat\u003c\/strong\u003e matched to the element length, pre-set to 60°C with an 85°C manual-reset safety cut-out, along with the correct sealing washer or O-ring.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; background: #E6F4F3;\"\u003eCan I fit this in a stainless steel cylinder?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px 18px; font-size: 14.5px; color: #333; line-height: 1.6; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThis is \u003cstrong\u003enot recommended\u003c\/strong\u003e. Because this variant has a copper thermostat pocket, fitting it into a stainless steel cylinder can cause galvanic corrosion which may eventually perforate the pocket. Choose the Incoloy-with-Incoloy-pocket or Titanium variant instead.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Tesla UK","offers":[{"title":"11\"\t2-1\/4\" BSP","offer_id":65644765479261,"sku":"TIH540","price":23.0,"currency_code":"GBP","in_stock":true},{"title":"14\"\t2-1\/4\" BSP","offer_id":65644765512029,"sku":"TIH545","price":25.0,"currency_code":"GBP","in_stock":true},{"title":"18\"\t2-1\/4\" BSP","offer_id":65644765544797,"sku":"TIH547","price":33.0,"currency_code":"GBP","in_stock":true},{"title":"23\"\t2-1\/4\" BSP","offer_id":65644765577565,"sku":"TIH548","price":37.0,"currency_code":"GBP","in_stock":true},{"title":"27\"\t2-1\/4\" BSP","offer_id":65644765610333,"sku":"TIH550","price":33.0,"currency_code":"GBP","in_stock":true},{"title":"30\"\t2-1\/4\" BSP","offer_id":65644765643101,"sku":"TIH555","price":39.0,"currency_code":"GBP","in_stock":true},{"title":"36\"\t2-1\/4\" BSP","offer_id":65644765675869,"sku":"TIH560","price":43.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/IncoloyImmersionHeater11to30inch.jpg?v=1787300374"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/collections\/Immersion_Heater.webp?v=1787292141","url":"https:\/\/qualityheating.co.uk\/collections\/immersion-heaters-elements-thermostats-accessories.oembed","provider":"AIZO Quality Heating","version":"1.0","type":"link"}