Recirculation Pump

Recirculation Pumps. Taking a long time to get hot water? Regardless of the type of water heater you have, there is still water in the pipes from the heater through the system and over time, the hot water will begin to cool down. Depending on the length of the pipe run, it can take up to 10 minutes of running water in order for the hot water to reach that fixture.

The function of the recirculation pump is to ensure that hot water is available when the fixture is turned on thus reducing water usage and saving money. In the past, in order to have a recirculation pump, you had to run a line from the farthest fixture back to the hot water heater. However, the technology has improved and now, that is no longer a requirement. These new “retrofit” pumps are a much more affordable option for homeowners who want to save time and money by having hot water when they turn on the sink or shower.

The pump works by installing a jumper between the hot and cold water lines at the farthest fixture. When the water temperature at that jumper falls below the set point, the pump will turn on forcing the hot water into the cold water side. Once the water temperature reaches the set-point, the pump will turn off. The pump can be programmed with a timer so you can control when you need the hot water. The drawing below shows the process.

Recirculation Pump Diagram

Based on your home and your preferences, we can make a recommendation of which pump would work best for you. Listed below on the two recirculation pump manufacturers that we recommend.

Grundfos Pumps

Laing Pumps

Tankless Hot Water Heater

Conventional Hot Water Heater