A pump should be sized to overcome the head losses of the water heater and frictional piping losses. It is recommended that the pump be sized to provide 2 GPM of flow based on 10 feet of head loss plus additional losses. Aquastat and/or timer should be used to maintain warranty of product. Please also refer to Plumbing applications in the installation manual.
Below are some pump manufacturer’s who can properly assist you with sizing your pump:
Grundfos – 913-227-3400
Taco – 401-942-8000
Bell & Gosset – 847-966-3700
Thermal switch that is used in recirculation systems; shuts off the pump when it senses the return water has reached a predetermined set temperature
Gallons per minute
In a recirculation system, a timer is used to turn a pump on and off within a programmed window of time.
the measure of energy lost from a fluid as it flows through a pipe; typically expressed as “feet of head”