How Does a Hot Water Recirculating System Work?

Hot water recirculating systems allow buildings to have practically instant hot water at every fixture, according to Home Energy Magazine. This constant movement of hot water through the pipes is a convenience for a building's residents and also saves energy.

Function

According to the NAHB Research Center, hot water recirculating systems are simply comprised of three components: a zone valve, a control unit and a pump. The pump functions by pushing the cold water within the pipes around to the hot water heater and back out through the pipes in a continuous process, creating a hot water loop that can be accessed whenever a faucet is turned on.

Types

Controllers for these systems vary from thermostats to timers, but all controllers regulate the valve when the optimum temperature is achieved, shutting the pump down for energy savings.

Capacity

It is only necessary to have one recirculating pump per residence or business, since it can service each fixture or faucet easily.

References

• NAHB Research Center: Hot Water Recirculation Systems
• Home Energy Magazine: Water Heaters and Energy Conservation: Choices, Choices!