Solar Thermal

The most efficient method of harnessing solar energy is to use it directly as heat, rather than converting it to some other energy such as electricity. (See photovoltaics)

The single largest problem with solar thermal systems is that when the solar availability is high, spatial heating demands are low. In order to match availability to demand, solar thermal systems are usually sized to meet a base load which is present all year long, such as domestic hot water rather than space heating.

In the UK, solar-thermal can typically provide about 50% of residential hot water needs for bathing, showers and hand-washing. Obviously a higher percentage can be provided in sunnier climates.

There are a number of different types, but the most common two are featured here.