In its contribution the solar thermal panels take some of the pressure off the heat pump as they have already done some of the necessary early work in order to increase the temperature within the system; it means the heat pump is in effect getting a head start or a ‘leg up.’ Without having to set off from a ‘standing start’ this means the heat pump doesn’t have to work as hard. It is a bit like the difference between boiling a kettle when filled from the cold tap to boiling a kettle when filled from the hot tap.

The reduced running time coupled with the smaller degree of work required from the heat pump increases COP of the heat pump and complete system respectively. This ultimately results in less electrical energy consumed by the heat pump and indeed less electricity to pay for!

To further increase on this already efficient heat pump and solar thermal combination, why not add some solar PV panels to the mix and create your own electricity. Solar PV panels can be on your roof in your garden or even on your walls. See solar PV section.