{"product_id":"baxi-amptec-s-electric-system-boiler-4kw-to-18kw-electric-central-heating","title":"Baxi Amptec S Electric System Boiler - 4kW to 18kW Electric Central Heating","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003c!-- Intro --\u003e\n  \u003cp style=\"margin:0 0 24px;\"\u003eThe \u003cstrong\u003eBaxi Amptec S\u003c\/strong\u003e is a \u003cstrong\u003ecompact, UK-manufactured electric system boiler\u003c\/strong\u003e that brings the familiar look and feel of a gas boiler to homes and properties where mains gas is not an option. Available in \u003cstrong\u003esix output sizes from 4 kW to 18 kW\u003c\/strong\u003e, with both single-phase and three-phase models, it suits everything from small flats to larger properties requiring more heating capacity. With a \u003cstrong\u003emodulating ratio of up to 9:1\u003c\/strong\u003e, \u003cstrong\u003eOpenTherm compatibility\u003c\/strong\u003e, and a built-in circulation pump and expansion vessel, the Amptec S is engineered to deliver genuinely efficient electric heating — and to keep installation tidy and fast.\u003c\/p\u003e\n\n  \u003c!-- Stat strip --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:0 0 28px;\"\u003e\n    \u003cdiv style=\"flex:1 1 130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;line-height:1;\"\u003e6\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eoutput sizes: 4–18 kW\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;line-height:1;\"\u003e9:1\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003emodulating ratio\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;line-height:1;\"\u003e35–80°C\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003etemperature range\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;line-height:1;\"\u003e284mm\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003edepth — fits 290mm cupboard\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;line-height:1;\"\u003e2yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eparts \u0026amp; labour warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: no flue \/ no gas installer needed (teal - informational) --\u003e\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:4px;padding:14px 16px;margin:0 0 16px;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eNo Flue. No Gas Supply. No Annual Gas Safety Check.\u003c\/strong\u003e — As a fully electric boiler, the Amptec S requires no flue, no gas connection, and no Gas Safe engineer. It is an ideal retrofit solution for properties with flue restrictions, rural off-gas homes, or any project where removing gas from the heating system is the goal.\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: installer amber — electrical supply requirements --\u003e\n  \u003cdiv style=\"background:#fff8e1;border-left:4px solid #f9a825;border-radius:4px;padding:14px 16px;margin:0 0 16px;\"\u003e\n    \u003cstrong style=\"color:#7a5800;\"\u003eElectrical Supply Note\u003c\/strong\u003e — Models \u003cstrong\u003eAmptec S4, S6, S8, and S12\u003c\/strong\u003e run on a standard \u003cstrong\u003e230 V single-phase\u003c\/strong\u003e supply. The \u003cstrong\u003eAmptec S14 and S18\u003c\/strong\u003e require a \u003cstrong\u003e400 V three-phase\u003c\/strong\u003e supply. Always confirm the available electrical supply before specifying a model. Installation and connection must be carried out by a qualified electrician.\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: system boiler — cylinder required for hot water (amber) --\u003e\n  \u003cdiv style=\"background:#fff8e1;border-left:4px solid #f9a825;border-radius:4px;padding:14px 16px;margin:0 0 28px;\"\u003e\n    \u003cstrong style=\"color:#7a5800;\"\u003eSystem Boiler — Cylinder Required for Hot Water\u003c\/strong\u003e — The Amptec S is a \u003cstrong\u003esystem boiler\u003c\/strong\u003e and does not provide hot water directly. A separate \u003cstrong\u003eindirect hot water cylinder\u003c\/strong\u003e is required for domestic hot water supply. It can also be used with a \u003cstrong\u003eSolar PV battery\u003c\/strong\u003e to help reduce running costs.\n  \u003c\/div\u003e\n\n  \u003c!-- Feature cards --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:15px;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3;border-top:none;border-radius:0 0 6px 6px;padding:16px;margin:0 0 28px;\"\u003e\n    \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:4px;\"\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eSix Output Sizes\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eAvailable as \u003cstrong\u003eAmptec S4, S6, S8, S12, S14, and S18\u003c\/strong\u003e — covering outputs from 4 kW to 18 kW. Single-phase models cover 4–12 kW; three-phase models cover 14 and 18 kW, giving specifiers the right fit for small flats up to larger multi-room properties.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eModulating Output up to 9:1\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eRather than simply switching on and off at full power, the Amptec S \u003cstrong\u003emodulates its heating element output\u003c\/strong\u003e in a ratio of up to 9:1. This means it intelligently matches heat delivery to demand, consuming only the electricity needed and directly cutting running costs.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eRadiator \u0026amp; Underfloor Heating\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eA \u003cstrong\u003ewide temperature range of 35°C to 80°C\u003c\/strong\u003e makes the Amptec S equally at home driving a traditional radiator system at higher flow temperatures or an underfloor heating circuit at lower temperatures — no additional controls or settings needed to switch between system types.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eOpenTherm Certified\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eFull \u003cstrong\u003eOpenTherm compatibility\u003c\/strong\u003e allows the boiler to communicate with smart controls — including the \u003cstrong\u003eBaxi uSense 2\u003c\/strong\u003e — enabling weather compensation and load modulation for maximum system efficiency. OpenTherm connection unlocks better performance than a simple on\/off thermostat connection.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eBuilt-In Pump \u0026amp; Expansion Vessel\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Amptec S ships with a \u003cstrong\u003ebuilt-in circulation pump and 7-litre expansion vessel\u003c\/strong\u003e. These components are housed within the boiler casing, reducing pipework, cutting installation time, and keeping the plant space tidy — all pipework connections are contained inside the unit.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eCompact Cupboard Fit\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eAt just \u003cstrong\u003e284 mm deep\u003c\/strong\u003e, the Amptec S fits comfortably inside a standard 290 mm deep cupboard. Weighing between 20 and 22.5 kg empty depending on model, it is light enough for one person to handle safely, making installation easier in tight or awkward spaces.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eDuty Cycling of Elements\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003e\u003cstrong\u003eDuty cycling\u003c\/strong\u003e rotates which heating elements are active, distributing wear evenly across all elements. This extends the working life of each element, improves long-term reliability, and helps maintain consistent thermal efficiency across the product's lifespan.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eLPG Alternative for Off-Gas Properties\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eFor properties without mains gas — rural homes, older buildings with flue restrictions, flats, garages, or extensions — the Amptec S is a \u003cstrong\u003ecleaner, safer alternative to LPG\u003c\/strong\u003e. No fuel deliveries, no storage tanks, no flue penetrations. Just a reliable electric heating solution.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eSolar PV Battery Compatible\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Amptec S can be used in conjunction with a \u003cstrong\u003eSolar PV battery system\u003c\/strong\u003e, allowing homeowners to use self-generated renewable electricity to run the boiler and directly offset running costs — making it a strong choice for homes with existing or planned solar installations.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Dimensions --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:15px;\"\u003eDimensions \u0026amp; Clearances\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3;border-top:none;border-radius:0 0 6px 6px;overflow:hidden;margin:0 0 28px;\"\u003e\n    \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;width:50%;\"\u003eWidth (A)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e395 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eHeight (B)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e718 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eDepth (C)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e284 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eSide Clearance (D)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e5 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eUpper Clearance (E)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e200 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eLower Clearance (F)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;border-bottom:1px solid #c8e6e3;\"\u003e200 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:10px 14px;font-weight:600;\"\u003eFront Clearance (G)\u003c\/td\u003e\n          \u003ctd style=\"padding:10px 14px;\"\u003e6 mm in operation \/ 450 mm for servicing\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Full technical spec table --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:15px;\"\u003eTechnical Specifications — All Models\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3;border-top:none;border-radius:0 0 6px 6px;overflow-x:auto;margin:0 0 28px;\"\u003e\n    \u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;min-width:660px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;font-weight:600;\"\u003eSpecification\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS4\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS6\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS8\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS12\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS14\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:center;font-weight:600;\"\u003eS18\u003c\/th\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#008377CF;color:#fff;\"\u003e\n          \u003ctd style=\"padding:6px 12px;font-size:13px;\"\u003eProduct Code\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828706\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828707\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828708\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828710\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828711\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\"\u003e7828712\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#e6f4f3;color:#005c54;\"\u003e\n          \u003ctd style=\"padding:6px 12px;font-size:13px;font-style:italic;\"\u003ePhase\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\" colspan=\"4\"\u003eSingle Phase (230 V)\u003c\/td\u003e\n          \u003ctd style=\"padding:6px 12px;text-align:center;font-size:13px;\" colspan=\"2\"\u003eThree Phase (400 V)\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eMax output (kW)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e4\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e6\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e8\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e12\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e14\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e18\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eWeight empty (kg)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e20\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e20\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e21.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e21.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e22.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e22.5\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eWeight full (kg)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e21\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e21\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e23\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e23\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e24.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e24.5\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eInternal volume (litres)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.5\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e2\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eExpansion vessel (litres)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"6\"\u003e7 (all models)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eTemperature range\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"6\"\u003e35–80°C (all models)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eMin \/ Max heating pressure (bar)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"6\"\u003e0.5 \/ 2.8 (all models)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003ePRV setting (bar)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"6\"\u003e2.8 (all models)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eSupply voltage\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"4\"\u003e230 V \/ 50 Hz\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"2\"\u003e400 V 3-ph \/ 50 Hz\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003ePower consumption (W)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e4,060\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e6,060\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e8,060\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e12,060\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e14,060\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e18,060\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;font-weight:600;\"\u003eInternal MCB (elements)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"2\"\u003e10 A × 3\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\" colspan=\"2\"\u003e20 A × 3\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e32 A × 3\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e32 A × 4\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#fff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003ePipe connections (flow \u0026amp; return)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;text-align:center;\" colspan=\"6\"\u003e22 mm (all models)\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:15px;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3;border-top:none;border-radius:0 0 6px 6px;padding:8px 0;margin:0 0 28px;\"\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eWhich Amptec S model is right for my property?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eOutput sizing depends on the heat loss of the property. As a rough guide, \u003cstrong\u003e4–6 kW\u003c\/strong\u003e suits smaller flats or well-insulated properties; \u003cstrong\u003e8–12 kW\u003c\/strong\u003e suits typical 2–3 bedroom homes; and \u003cstrong\u003e14–18 kW\u003c\/strong\u003e (three-phase) suits larger properties with higher heat demand. A heat loss calculation by a qualified engineer will give you an accurate answer. Note that S14 and S18 models require a \u003cstrong\u003ethree-phase 400 V supply\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eDoes the Amptec S provide hot water as well as heating?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eNo. The Amptec S is a \u003cstrong\u003esystem boiler\u003c\/strong\u003e and provides central heating only. To supply domestic hot water you will need a separate \u003cstrong\u003eindirect hot water cylinder\u003c\/strong\u003e. The boiler heats the cylinder's coil, which in turn heats the stored water. This is a standard and straightforward arrangement for system boiler installations.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eIs the Amptec S suitable for underfloor heating?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eYes. The \u003cstrong\u003eadjustable temperature range of 35°C to 80°C\u003c\/strong\u003e means the Amptec S can operate at the low flow temperatures typically required for underfloor heating (usually 35–45°C) as well as the higher temperatures needed for standard radiator systems. No additional low-loss header or blending valve is required for typical UFH circuits, though system design will dictate the exact configuration.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eWhat does OpenTherm compatibility mean in practice?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eOpenTherm is a communication standard that allows a smart thermostat — such as the \u003cstrong\u003eBaxi uSense 2\u003c\/strong\u003e — to send temperature demand information directly to the boiler rather than simply switching it on or off. This enables the Amptec S to \u003cstrong\u003emodulate its output precisely to match the demand\u003c\/strong\u003e, avoiding over-heating and reducing electricity consumption. An OpenTherm-connected system will typically be more efficient than a standard on\/off thermostat installation.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eDoes the Amptec S need an annual service?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eElectric boilers generally require \u003cstrong\u003eless routine maintenance\u003c\/strong\u003e than gas boilers. There is no annual gas safety certificate requirement, no combustion analysis, and no flue inspection. Baxi recommends a periodic check by a qualified engineer to inspect electrical connections, system pressure, and the condition of the heating water — but the service requirements are significantly lighter than for gas or oil appliances.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"padding:0 16px;\"\u003e\n      \u003csummary style=\"font-weight:600;padding:12px 0;cursor:pointer;color:#005c54;\"\u003eCan the Amptec S work with a Solar PV or battery system?\u003c\/summary\u003e\n      \u003cp style=\"margin:8px 0 14px;\"\u003eYes. The Amptec S is compatible with use alongside a \u003cstrong\u003eSolar PV battery system\u003c\/strong\u003e. By diverting surplus solar-generated electricity to run the boiler, homeowners can reduce the amount of grid electricity consumed for heating — directly lowering running costs. This makes the Amptec S a particularly strong choice for properties with existing solar installations or those planning to add renewables in the future.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Baxi","offers":[{"title":"4kW - Single Phase","offer_id":64662582722909,"sku":"7828706","price":1700.0,"currency_code":"GBP","in_stock":false},{"title":"6kW - Single Phase","offer_id":64662582755677,"sku":"7828707","price":1700.0,"currency_code":"GBP","in_stock":false},{"title":"8kW - Single Phase","offer_id":64662582788445,"sku":"7828708","price":1700.0,"currency_code":"GBP","in_stock":false},{"title":"12kW - Single Phase","offer_id":64662582821213,"sku":"7828710","price":1700.0,"currency_code":"GBP","in_stock":false},{"title":"14kW - Three Phase","offer_id":64662582853981,"sku":"7828711","price":1700.0,"currency_code":"GBP","in_stock":false},{"title":"18kW - Three Phase","offer_id":64662582886749,"sku":"7828712","price":1700.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Baxi_Amptec-S_ElectricBoiler.webp?v=1778507000","url":"https:\/\/qualityheating.co.uk\/products\/baxi-amptec-s-electric-system-boiler-4kw-to-18kw-electric-central-heating","provider":"AIZO Quality Heating","version":"1.0","type":"link"}