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Product Description The On Command is a small, silent pump that attaches to the hot and cold water lines in the cabinet under the most remote kitchen or bath fixture in the home. When the On Command is activated, the cool water you normally let run down the drain is recirculated back to the water heater through the cold water line. When the hot water arrives at the faucet, the On Command heat sensor and control board shut off the pump to prevent pumping excess hot water into the cold water line. From the Manufacturer The On Command is a small, silent pump that attaches to the hot and cold water lines in the cabinet under the most remote kitchen or bath fixture in the home. When the On Command is activated, the cool water you normally let run down the drain is recirculated back to the water heater through the cold water line. When the hot water arrives at the faucet, the On Command heat sensor and control board shut off the pump to prevent pumping excess hot water into the cold water line.