If a fixture is opened to flow water, the pressure in the line is instantly lowered. Pressure is the energy that moves water through the piping. ... Hence, in a recirculating system, the hot water being pumped through the piping always tends to have a higher pressure than the return line to which it connects.

Do circulation pumps create pressure?

The circulators in the system should be located so they are “pumping away” from the expansion tank. ... The reason is the circulator is not pushing or pulling the water around the system, but rather it is circulating the water through the system. The circulator does not create pressure, only pressure differential.

What purpose does a recirculation pump serve?

A home water re-circulating pump is used to circulate domestic hot water so that any faucet or shower will provide hot water instantly upon demand. These systems slowly pump hot water through your hot water pipes and back to the water heater through either a dedicated line or through the cold water line.