Hot  water recirculation systems generally consist of a pump, an integrated  electronic controller, and a zone valve. When the activation button is pushed,  or when another type of control turns the system on, the pump starts  re-circulating cooled water that's been sitting in the hot water line and sends  it back to the water heater through the cold water line.  
                                 
It is  much like turning on the hot water faucet and letting the water run until it  gets hot, but instead of the water going down the drain; it is simply returned  back to the water heater. When the hot water faucet is turned on, hot water is  readily available. Re-circulating systems use a pump to rapidly move water from  a water heater to the fixtures.  Our plumbing company wants to make sure you know what you  are getting when you hire us for Hot water recirculation repair and  installation.  | 
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