zero carbon heat batteries
We are the makers of Warmstone™, the world’s most efficient and technologically advanced zero carbon heat battery for household use.

I want to buy

If you’re on oil or LPG, our Zero-Carbon Warmstone Heat Battery is going to save you thousands of pounds in heating bills – as well as significantly reduce your family’s carbon footprint. Our solution is cheaper and easier to install than air source heat pumps with no disruption to your home.

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Partners

Is Warmstone for me?

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I live in the UK and want to reduce my carbon footprint
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My home and hot water is currently heated by oil or LPG
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I have or will soon install a smart meter

cheaper and easier to install than air source heat pumps

Lifetime heating costs vs ASHP
Lifetime heating costs vs ASHP

Worked Example: 153 m2 detached home using 25,236 kWh per annum for heating and hot water. The home currently uses oil for heating and generates 7.75 tonnes CO2 per annum. A comparison of Warmstone annuals costs versus an air source heat pump plus retrofit.

Source Gemserv Analysis  https://gemserv.com

*Installed cost subject to T&Cs

FAQ

WarmstoneTM is our patented solid storage material that is made from a combination of recycled and natural materials.

We use cheap nighttime electricity to heat the solid core of the Caldera. We then use the stored heat to provide a supply of hot water and heating to your home during the day when you need it.

If you live in a house that uses heating oil or LPG, has solid walls (built pre-1930) and normal radiators, then you will almost certainly be better off with a heat battery.

feedback

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We are excited to be shareholders in Caldera and look forward to supporting their vision to help decarbonise home heating.
Nina Zwiebelhofer
Owner and managing director of the König Metall Group
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Caldera has created a potentially game-changing technology with Warmstone, and we are working hard to help them to bring it to market.
Guy Newey
Strategy and Performance Director at Energy Systems Catapult
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The Warmstone heat battery is a simple, innovative technology and a game changing step forward.
Hans-Jörg Leuze
Executive Board Member of the König Metall Group

I want to buy