{"product_id":"manifold-ball-valve-set-with-temperature-gauge-1-ufh-red-blue-handles-pair","title":"Manifold Ball Valve Set with Temperature Gauge 1\" UFH – Red \u0026 Blue Handles (Pair)","description":"\u003c!-- SEO Product Name: 1\" UFH Manifold Ball Valve Set with Temperature Gauge – Red \u0026 Blue (Pair) – ZL-4012 --\u003e\n\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#222;max-width:900px;line-height:1.6;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eZL-4012 Ball Valve Set\u003c\/strong\u003e upgrades manifold isolation with an \u003cstrong\u003eintegrated temperature gauge on every valve\u003c\/strong\u003e, giving the installer immediate visual confirmation of \u003cstrong\u003eflow and return temperatures\u003c\/strong\u003e at the manifold without separate sensor pockets or clip-on thermometers. Supplied as a matched pair in \u003cstrong\u003ecolour-coded red (flow) and blue (return)\u003c\/strong\u003e, these \u003cstrong\u003e1\" nickel-plated brass ball valves\u003c\/strong\u003e combine positive quarter-turn isolation with at-a-glance temperature monitoring — making them the preferred choice for commissioning and ongoing system diagnostics.\u003c\/p\u003e\n\n\u003c!-- STAT STRIP --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:8px;margin:20px 0;\"\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px;flex:1;min-width:130px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:1.25em;\"\u003e1\"\u003c\/strong\u003e\u003cbr\u003eBSP Size\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px;flex:1;min-width:130px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:1.25em;\"\u003eTemp Gauge\u003c\/strong\u003e\u003cbr\u003eIntegrated\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px;flex:1;min-width:130px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:1.25em;\"\u003ePair\u003c\/strong\u003e\u003cbr\u003eSupplied\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px;flex:1;min-width:130px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:1.25em;\"\u003eNickel Plated\u003c\/strong\u003e\u003cbr\u003eBrass Body\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px;flex:1;min-width:130px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:1.25em;\"\u003eRed \u0026amp; Blue\u003c\/strong\u003e\u003cbr\u003eColour Coded\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- AMBER CALLOUT --\u003e\n\u003cdiv style=\"background:#fffbea;border-left:5px solid #e6a817;padding:14px 18px;margin:18px 0;border-radius:4px;\"\u003e\n  \u003cstrong style=\"color:#b87d00;\"\u003eCompatibility Note:\u003c\/strong\u003e Sized for the \u003cstrong\u003e1\" MT flat-sealing connections\u003c\/strong\u003e on the ZL-117502–ZL-117512 stainless steel manifold range and most other standard 1\" UFH manifolds. The \u003cstrong\u003ered valve\u003c\/strong\u003e connects to the flow (supply) port; the \u003cstrong\u003eblue valve\u003c\/strong\u003e to the return port. Fit \u003cstrong\u003ebefore system fill\u003c\/strong\u003e to allow correct commissioning sequence.\n\u003c\/div\u003e\n\n\u003c!-- TEAL CALLOUT --\u003e\n\u003cdiv style=\"background:#e8f7f6;border-left:5px solid #008377;padding:14px 18px;margin:18px 0;border-radius:4px;\"\u003e\n  \u003cstrong style=\"color:#008377;\"\u003eDiagnostic Advantage:\u003c\/strong\u003e With temperature gauges fitted at both the \u003cstrong\u003esupply and return\u003c\/strong\u003e, the installer can instantly read the \u003cstrong\u003etemperature differential (ΔT)\u003c\/strong\u003e across the manifold during commissioning. A ΔT of 5–10°C across the circuit is the target for most UFH systems — confirming that loop flows are correctly balanced before handover.\n\u003c\/div\u003e\n\n\u003c!-- FEATURE CARDS --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:16px;margin:24px 0;\"\u003e\n\n  \u003cdiv style=\"flex:1;min-width:240px;background:#f9f9f9;border-radius:8px;padding:18px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;font-size:1.05em;\"\u003eIntegrated Temperature Gauge\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eEach valve in the pair incorporates a \u003cstrong\u003edirect-reading dial thermometer\u003c\/strong\u003e in the valve body. This gives a real-time temperature display at the manifold without additional sensor pockets, wiring, or clip-on accessories — reducing installation complexity and keeping the manifold assembly compact.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:240px;background:#f9f9f9;border-radius:8px;padding:18px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;font-size:1.05em;\"\u003eNickel-Plated Brass Body\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eThe \u003cstrong\u003enickel-plated brass construction\u003c\/strong\u003e provides corrosion resistance superior to uncoated brass in systems where condensation or damp conditions may affect external surfaces. The smooth nickel finish also resists flux residue and system inhibitor staining, keeping the manifold assembly looking professional long after installation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:240px;background:#f9f9f9;border-radius:8px;padding:18px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;font-size:1.05em;\"\u003eFull-Bore Quarter-Turn Isolation\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eA \u003cstrong\u003efull-bore ball valve mechanism\u003c\/strong\u003e delivers negligible pressure drop in the open position — the pipe bore is completely unobstructed when the valve is open. Quarter-turn operation ensures definitive open\/closed positions with no risk of partial seating, giving reliable isolation for pressure testing or servicing.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:240px;background:#f9f9f9;border-radius:8px;padding:18px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;font-size:1.05em;\"\u003eO-Ring Sealed Faces\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eFlat-face connections are sealed with \u003cstrong\u003eO-ring gaskets\u003c\/strong\u003e that compress evenly under tightening, providing a reliable leak-free joint without requiring excessive torque. This protects the manifold body threads and ensures a sound seal is achieved every time.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- SPEC TABLE --\u003e\n\u003cdiv style=\"overflow-x:auto;margin:24px 0;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background:#008377;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 14px;text-align:left;\" colspan=\"2\"\u003eTechnical Specification — ZL-4012\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eZL-4012\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e1\" Ball Valve with Temp Gauge Set — Red \u0026amp; Blue (Pair)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eValve Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e1\" BSP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eValve Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eFull-bore ball valve, quarter-turn\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eBody Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eNickel-plated brass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eConnection Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eBSP Male–Female with O-ring sealing faces\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eHandle Colours\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eRed (flow\/supply) \u0026amp; Blue (return)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eTemperature Gauge\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eIntegrated dial thermometer on each valve\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003ePair (2 valves)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eUFH manifold supply \u0026amp; return isolation with temperature monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003e\u003cstrong\u003eCompatible Manifolds\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 14px;\"\u003eZL-117502 to ZL-117512 stainless steel manifold range and most 1\" UFH manifolds\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- FAQs --\u003e\n\u003cdiv style=\"margin:28px 0;\"\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 18px;border-radius:6px 6px 0 0;font-weight:bold;font-size:1.05em;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #ddd;border-top:none;padding:0;\"\u003e\n    \u003csummary style=\"padding:12px 16px;cursor:pointer;font-weight:bold;background:#f9f9f9;\"\u003eWhy choose the ZL-4012 over the ZL-4130 plain ball valve set?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px;\"\u003eThe \u003cstrong\u003eZL-4012 adds an integrated temperature gauge\u003c\/strong\u003e to each valve, allowing both \u003cstrong\u003eflow and return temperatures\u003c\/strong\u003e to be read directly at the manifold — without separate sensor pockets or contact thermometers. This is particularly valuable during commissioning (to verify ΔT) and for ongoing diagnostics (to confirm the blending valve is delivering the correct supply temperature).\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #ddd;border-top:none;padding:0;\"\u003e\n    \u003csummary style=\"padding:12px 16px;cursor:pointer;font-weight:bold;background:#f9f9f9;\"\u003eWhat temperature range do the gauges display?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px;\"\u003eThe integrated dial thermometers are calibrated for \u003cstrong\u003etypical hydronic heating temperatures\u003c\/strong\u003e, covering the range applicable to both conventional boiler circuits (up to ~80°C) and heat pump low-temperature systems (down to ~30°C). For precise calibration ranges, refer to the product datasheet available on request.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #ddd;border-top:none;padding:0;\"\u003e\n    \u003csummary style=\"padding:12px 16px;cursor:pointer;font-weight:bold;background:#f9f9f9;\"\u003eDo these valves include a drain or fill port?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px;\"\u003eNo — these are \u003cstrong\u003eisolation ball valves only\u003c\/strong\u003e. System fill, drain, and flush connections are provided by the \u003cstrong\u003eintegrated end-set\u003c\/strong\u003e on the ZL-series manifold body itself. The ball valves isolate the manifold from the primary circuit; the end-set manages the UFH loop side.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #ddd;border-top:none;padding:0;\"\u003e\n    \u003csummary style=\"padding:12px 16px;cursor:pointer;font-weight:bold;background:#f9f9f9;\"\u003eCan these be used with a heat pump primary circuit?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px;\"\u003eYes. The \u003cstrong\u003enickel-plated brass\u003c\/strong\u003e is fully compatible with closed heat pump circuits using all standard inhibitors. The integrated temperature gauges are particularly useful on heat pump systems, where maintaining the correct \u003cstrong\u003elow flow temperature\u003c\/strong\u003e (typically 35–45°C) is critical for SCOP performance — the gauges give immediate confirmation that the blending valve is set correctly.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"AIZO - Quality Heating","offers":[{"title":"Default Title","offer_id":64926955503965,"sku":"ZL-4012","price":23.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/BALLVALVEWITHTEMPGAUGESETRED_BLUE.jpg?v=1780941340","url":"https:\/\/qualityheating.co.uk\/products\/manifold-ball-valve-set-with-temperature-gauge-1-ufh-red-blue-handles-pair","provider":"AIZO Quality Heating","version":"1.0","type":"link"}