What size water pump should I fit to circulate the ground-loop water?
The circulation pump for the ground loop is not included in the heat pump (however, an internal pump is provided to circulate the heated output water). We recommend that the pump should produce a flow rate of at least 0.25litres/second and be capable of working with a 10m head. Bearing in mind the resistance of the ground loop, this generally requires a circulation pump of at least 250watts electrical consumption.
