How much ground water does an open-loop system need?
Ground-source heat pumps used in open-loop systems need differing amounts of water depending on the size of the unit and the manufacturer’s specifications. The water requirement of a specific model is usually expressed in gallons per minute (G.P.M.) And is listed in the specifications for that unit. Your heating contractor should be able to provide this information. Generally, the average system will use 4 to 12 G.P.M. while operating. An extremely cold day might result in a usage of 4,000-10,000 gallons of water. Your well and pump combination should be large enough to supply the water needed by the heat pump in addition to your domestic water requirements. You will probably need to enlarge your pressure tank or modify your plumbing to supply adequate water to the heat pump.
