In the News

Homes could be kept warm with giant “heat batteries” developed by a British start-up that has won backing from the government and external investors.

Caldera, based in Hampshire, uses cheap off-peak power and electrical elements to heat a huge highly-insulated block of material called Warmstone, made from recycled metals and aggregate. A coil of water pipes pass through the block, heating up water that can then be used in a conventional central heating system with radiators and a hot water tank.

Read more at The Times