A single unit will have enough capacity for most homes. The system is modular – where a higher storage capacity or maximum output is needed, multiple Warmstone can work in tandem. The only limit on how many Warmstones can be combined is the power supply.

The Warmstone is designed to be retrofitted as a replacement for fossil fuel boilers, with similar thermal output and connections. Some customers will prefer a ‘hybrid’ install where they keep their existing boiler as a backup.

Unit Layout

Warmstone layout diagram

Base & Delivery

A concrete plinth will often be needed to provide a base for the Warmstone. A diagram showing typical base dimensions is included in the Installation Specification.

We will deliver the unit to site using a lorry with a loader crane. If it is not possible for the crane to reach the final position, for example if installation will be in a garage, we have specialist lifting equipment with which to move the unit into position.

Load Management

The electrical controls which manage the charging of the unit has been co-developed with myenergi, who are known for their zappi car charger. Each Warmstone contains a myenergi device which connects to the internet and allows charging to be controlled via an app.

The Warmstone charges at up to 90 amps, so a Current Transformer (CT) measuring device monitors other loads in the home and turns down charging to stay within the 100 amp main fuse limit. If a 100 amp supply is not available the maximum charging level can be set during commissioning.


Installations vary, but the standards connections are:

Installation Process

While every install will be different, most would include:


Warmstone Datasheet
Warmstone Installation Specifications
Warmstone Product Drawing

All information and specifications may change as we continue to evolve the Warmstone.