How it works

How our system works

The core of our system is the Warmstone Heat Battery which is located outside your property.

The heat battery is heated by electrical elements similar to those used in your kettle and can be charged by low-cost, off-peak green electricity from the grid.

This heat is then stored, ready to be used whenever required via a heat exchange unit in your home. It delivers oodles of hot water on demand – to your central heating, and your bath, sinks and shower.


In the UK today there are three electricity suppliers offering 5p/kWh off-peak tariffs – making the electrification of heat an affordable option.

In addition, you can store and use electricity from your own solar PV panels to reduce or eliminate your hot water bills during the summer months. 7kW of additional PV can be fed directly to the unit without restrictions.