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Hot water circulator

Traditional hot water circulating systems use a hot water circulating pump to pump hot water from the water heater, through the hot water piping, and on back to the water heater through an additional length of pipe that runs from the furthest fixture back to the water heater. This provides you with instant hot water.

 This type of hot water circulating system provides nearly instant hot water at the fixtures, but wastes a tremendous amount of energy through both the energy required to operate the hot water pump and even more heat energy lost from the piping.

Sometimes the circulating pump is controlled by a temperature sensing circuit that shuts the hot water pump off once the water temperature reaches a pre-set temperature such as 140 degrees and then starts the pump back up when the water temperature in the pipe drops below a second set point such as 110 degrees.

This type of system does little to reduce the energy losses because the lower set point is still high enough to cause continual large heat losses from the system, and the pump does not contribute nearly as much to the loss as the heat loss itself.