Baxi Amptec S6 6kW Electric System Boiler
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The Baxi Amptec S6 is a 6 kW 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 homes without a gas supply. 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.
A new electric heating installation or a like-for-like electric boiler refurbishment — flats, off-grid properties, social housing and landlord upgrades. 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.
Not a combi — stored hot water needs a separate cylinder. At 6 kW it suits smaller, well-insulated properties; for larger heat demands step up through the S8–S18. Three-phase properties should look at the S14 or S18.
Key specifications
| General | |
| Brand | Baxi |
| Model | Amptec S6 |
| Boiler type | Electric system boiler |
| Output (central heating) | 6 kW |
| Power supply | Single 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) | 20 kg |
| Installed weight (filled) | 21 kg |
| Packaged weight | 23.2 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 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 4 kW, 8 kW, 12 kW, and three-phase 14 kW and 18 kW models.
Ideal For
Flats and smaller homes off the gas grid that need a compact, flueless system boiler for radiators or underfloor heating — with next-day national delivery or click & collect from our Reading trade counter.
At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.
🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
for selected local areas.
Eligible Postcodes Include:
- RG*
- SL*
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- HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
- WD*, HA*, UB*, TW*, KT*
- W1* – W9*
- NW*, SW*
Delivery Time: 2–4 working days
Shipping Cost: £0.00
📦 Standard Shipping (Weight-Based Rates)
For orders that do not qualify for free delivery, standard
shipping rates apply based on total cart weight.
- For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
- For cart weight between 2–24 kg, the shipping cost is £9.99 with a delivery time of 2–4 working days.
- For cart weight between 24 kg and above, the shipping cost is £60 with a delivery time of 2–4 working days.
🧱 Block Salt (Harvey’s) – Unit-Based Shipping
This rate applies only to Harvey’s block salt products.
- £7.99 is charged for every 3 items.
- The charge increases by £7.99 for each additional set of 3 items.
Examples:
- 1–3 items → £7.99
- 4–6 items → £15.98
- 7–9 items → £23.97
Delivery Time: 2–4 working days
📏 Large / Long Items (Length-Based Shipping)
For oversized items where the product length is 1.5 metres or more:
Conditions:
- Product length ≥ 1.5 m
- Cart weight ≤ 40 kg
Shipping Cost: £18.00 (flat rate)
Delivery Time: 2–4 working days
Collection from Store
Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.
