Baxi Amptec S14 14kW Electric System Boiler (Three Phase)
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The Baxi Amptec S14 is a 14 kW three-phase electric system boiler for wet central heating — now sold under the Baxi brand, previously Heatrae Sadia. It needs no gas supply and no flue, runs both radiators and underfloor heating, and carries its circulation pump, expansion vessel and HMI display inside one compact, UK-built unit that fits a 290 mm deep cupboard.
Applications & suitability
Sealed wet central heating in properties with a three-phase electrical supply and no gas. Runs radiators or underfloor circuits from 30–80 °C, and with pump, expansion vessel and controls built in it drops into a 290 mm deep cupboard with no flue to route.
Larger houses, HMOs and light commercial spaces off the gas grid — new electric installations or refurbishments of existing electric boilers. Baxi state it can also be used in conjunction with a solar PV battery.
Certified OpenTherm, so it pairs with OpenTherm controls including the Baxi uSense 2 for best efficiency. As a system boiler it works with a separate hot water cylinder, and it joins Baxi’s existing Amptec and Electromax electric range.
Requires a three-phase supply — most UK homes are single phase, so check before ordering. Single-phase properties should use the S4–S12 instead. Not a combi: stored hot water needs a separate cylinder.
Key specifications
| General | |
| Brand | Baxi |
| Model | Amptec S14 |
| Boiler type | Electric system boiler |
| Output (central heating) | 14 kW |
| Power supply | Three phase |
| Performance | |
| Flow temperature (max) | 80 °C (adjustable from 30 °C) |
| Modulation ratio | Up to 9:1 |
| Controls compatibility | Certified OpenTherm (incl. Baxi uSense 2) |
| Dimensions & weight | |
| Packaged dimensions (H × W × D) | 889 × 444 × 350 mm |
| Lift weight (dry) | 22.5 kg |
| Installed weight (filled) | 24.5 kg |
| Packaged weight | 25.7 kg |
| Warranty & provenance | |
| Warranty | 2 years |
| Country of manufacture | United Kingdom |
Installation & compatibility
No gas and no flue, so no Gas Safe engineer is needed. The fixed three-phase electrical connection must be made by a qualified electrician — in England and Wales this work falls under Part P of the Building Regulations. A filling loop and rear pipework kit are available separately.
Related & next steps
For filling and pressurising the sealed system at install.
View filling loopRoutes pipework behind the boiler for a tidier first fix.
View pipework kitAlso available in single-phase 4 kW, 6 kW, 8 kW and 12 kW models, and a three-phase 18 kW.
Ideal For
Larger off-gas properties with a three-phase supply that need serious electric heating output from a compact, flueless unit — with next-day national delivery or click & collect from our Reading trade counter.
