This past weekend, I decided to improve the efficiency of our home even more by installing a whole-house hot water recirculating system. I picked up a unit made by Watts Premier at Costco a few months ago for under $200, and spent another $30 or so for plumbing supplies at the hardware store.The system includes a pump that you install adjacent to the water heater, and a temperature actuated bypass valve that connects the cold and hot water supply lines at the fixture that is farthest away from the water heater. According to the manufacturer's website, this combination creates a pressure differential that allows the cold and cool water in the hot water supply line to "bypass" (at a low volume) into the cold water supply line through the thermostatically controlled sensor valve, keeping the water in the hot water supply line at a "no-wait" temperature throughout the home. The timer on the pump makes it more efficient during downtime.


















