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A British-built domestic heat battery could help decarbonise millions of UK homes. Caldera has invented a hyper-efficient thermal store which automatically heats up when renewable electricity costs are lowest. This funding will accelerate the rollout of pilot schemes this year.

  • Nationwide rollout could create gigawatts of energy storage.
  • Simple, low-cost system made from recycled and natural materials.
  • Est £3.5 bn total annual addressable EU market.
  • Cornerstone investor König Metall leading the current round.
Information £110,000 of funds on the progress bar represent funds raised by the Company prior to launching the campaign. The Company has received these funds and will issue shares in respect of them whilst the pitch is live. The Company does not intend to spend these funds prior to completion of the Crowdcube raise, which will occur on the same material terms and share price.

Idea

In Britain, we have ambitious goals to decarbonise our economy by 2050.

Caldera takes renewable energy when it is low cost (using a flexible green tariff with prices as low as 5p/kWh) and stores it as heat, providing carbon-free hot water and heating.

Our patented breakthrough WarmstoneTM heat battery can store enough heat (100kWh) for a standard home for 24 hours.

The idea is the brainchild of engineers James Macnaghten and Guy Winstanley. After a decade working on thermal storage, our founders saw the potential of an ultra-efficient vacuum insulated heat battery.

To date we have:

• Raised over £1.5 million through grants and investment;

• Installed our first pilot Warmstone product in a family home;

• Established a manufacturing and R&D base;

• Been supported by the Energy Systems Catapult;

We intend to build and sell Warmstone units via a range of approved UK installers. In the EU; we work with manufacturing partners like König Metall and our intention for the rest of the world is to license the technology.

We also plan to install a small number of pilot units in trial homes this year, prior to a full commercial rollout in 2022.

Caldera have developed an easily adopted technology which can help reduce CO2 emissions in every home it is used. Your investment will enable us to begin changing the way our homes are heated forever, saving millions of tonnes of CO2 worldwide.

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Risk warning

Investments of this nature carry risks to your capital, including illiquidity, lack of dividends and dilution. Balance risk with a diversified portfolio. Read more. Approved as a financial promotion by Crowdcube Capital Limited, which is authorised and regulated by the Financial Conduct Authority.

Investment opportunities are not offers to the public and investors must be eligible Crowdcube members. Further restrictions and Crowdcube's limitation of liability are set out in the Investor Terms and Conditions. Please seek independent advice as required as Crowdcube does not give investment or tax advice.

Caldera has been given advance assurance by HMRC that the proposed share issue is likely to qualify for Enterprise Investment Scheme (EIS) tax relief.

Tax relief is available to individuals only, with income tax relief currently set at 30 per cent of the cost of the shares for the tax year in which the investment was made. The tax reliefs can also reduce your Capital Gains Tax bill. Read More.

Availability of tax relief depends on your individual and the company’s ongoing circumstances and applicable law.