Baxi launched the Amptec S, an electric system boiler, on 4 September 2025, according to the Chartered Institute of Plumbing and Heating Engineering (CIPHE). The institute described it as "a state-of-the-art electric system boiler to provide an energy-efficient alternative heating and hot water solution to gas"1.
The boiler is manufactured in the UK and comes in six models ranging from 4kW to 18kW1. Baxi has made the unit compatible with OpenTherm, a universal communication protocol, for integration with a range of controls1.
The unit includes a circulation pump and an expansion vessel, with all pipework inside the boiler, which CIPHE said reduces installation times and saves space1. It also has a Human Machine Interface (HMI) intended to improve user experience and assist with maintenance and fault finding1. The design is described as lightweight and compact, fitting into a cupboard 290mm deep1. It carries a 2-year warranty1.
CIPHE reported that the Amptec S can be paired with solar PV via PV batteries, and that it can provide heat and hot water when used with an indirect cylinder1. Rob Pearse, Residential Business Director at Baxi, said:
"Keeping manufacturing in the UK means we can easily adapt to what our UK customers and users really need. We've considered the installer's experience at every step of the design process with the Amptec S and, in doing so, we've made an electric boiler that's easy to work with because of its small size and weight. Most importantly, however, it is also able to provide energy efficient heat and hot water when used in conjunction with an indirect cylinder."
Baxi is an Industrial Associate of CIPHE1.
Why it matters for households
An electric system boiler gives a household a route to space heating and hot water that does not burn gas on site. For a home's energy independence, that shifts the fuel source rather than removing the demand: running costs then depend on the price of electricity and on how the power is generated or stored. The reported ability to pair the unit with solar PV and PV batteries is the part that speaks most directly to self-supply, since a household generating its own electricity can use it for heat rather than drawing entirely from the grid1. The modulating ratio and element cycling are presented as ways to match output to demand, which bears on running costs1. Because the Amptec S works with an indirect cylinder, hot water storage remains part of the setup rather than being delivered instantaneously1. CIPHE did not report prices, efficiency ratings or running-cost figures for the models, and no comparative running costs against gas have been published.
What happens next
No installation dates, availability timetable or pricing have been reported1.
Sources1 cited
- New Baxi Amptec S Electric Boiler, ciphe.org.uk