Why are two pumps for one closed loop needed?
Two loops pumps are needed to overcome the pressure drops associated with pumping liquid through a large loop. We must have a minimum flow rate. A 2 ton system could use 1 pump – 3 to 5 ton systems use two pumps and 6 to 10 ton duals use four pumps. The Grunfoss pumps that we use are low voltage circulator pumps only. The capitol cost and the cost of operating two pumps is lower than using one high pressure pump.
