SOLAR THERMAL harnesses the power of the sun to heat your hot water. It is a very simple idea and one of our favourite technologies as once installed your solar thermal system will just keep giving. Collectors on your roof (in your roof or on a frame) get hot and absorb solar energy, even in cloudy conditions, which heats water inside them. Once the fluid inside the collectors is 4C warmer than your hot water cylinder a pump switches on and transfer heat into hot water. A well designed system with a good roof pitch, facing the sun with little over-shadowing can easily provide 75 – 80% of your hot water needs.