This property was originally heated by oil with radiators. We supplied underfloor heating for the new extension installed on a joisted floor using Duofor plates. Duofor plates are galvanised steel dovetailed sheets which are laid on top of the joists with the underfloor heating fixed on top and self-levelling screed to make up the finished floor. This system is ideal for use with a heat pump as it can run at very low temperatures allowing for a higher seasonal coefficient of performance. It also offers good sound-proofing and fire resistance.

Two Ochsner GMLW 14kW air source heat pumps were fitted in a cascade, and connected to a 1500L Tisun Pro-Clean tank. The Pro-Clean tank is a combined buffer and domestic hot water tank, designed to be stratified allowing a higher temperature at the top for domestic hot water and cooler water at the bottom for the heating. The spherical solar heat exchanger on the side of the tank offers the unique feature that the solar heats from the top of the tank downwards, meaning that solar energy can be utilised quickly when it is available.