This owners of this 1990’s converted oast house wanted to do away with their old, inefficient oil-fired boiler. After weighing up the relative merits of ground source vs air source heat pumps, they opted for the former taking advantage of an area of land near to the house.

After analysing the building heat losses, we determined that the existing wall-mounted radiators would be able to provide sufficient heat at the lower flow temperature output by the heat pump without any modification. However, we did need to replace the hot water cylinder with a heat pump compatible 300L NIBE Megacoil cylinder.

After decommissioning and removing the oil boiler, we were able to install a 12kW NIBE S1155 ground source heat pump in the same lean-to, next to the house and to connect onto the existing hot water and heat distribution systems. The heat pump is supplied by a 600mm horizontal ground collector array comprised of 3 x 200m loops connected to a buried manifold chamber. The soil thermal conductivity was estimated to be relatively low (~1.00 W/mK) and the ground collector was extended to compensate.

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