Solar thermal

Solar panels, used to power lighting, on the roof of Brancaster Millennium Activity Centre, Norfolk

This nifty scheme uses the sun’s heat to warm up water.

It does this by heating a cold liquid in a closed pipe loop, which circulates within a hot water storage tank (it doesn’t come into contact with the water).

Did you know? It doesn’t need to be a bright sunny day for this to work, but the system can be less efficient.