Domestic Hot Water Recirculation System

By Robert Robillard on Uncategorized

How a Domestic Hot Water Recirculation System Works

Tired of waiting for hot water?hot water recirculation system

How many times have you turned on the faucet or shower and have to wait for hot water.  You can eliminate this wait by installing a domestic hot water recirculation system.

A domestic hot water recirculation system means instant hot water with no waiting.  Many people claim that the extra energy of the circulation pump is a waste of energy but so isn’t waiting for the hot water to arrive.   If recirculation system pumps constantly then I would agree that the system is wasting a ton of energy.  But they don’t pump all day, read more….

Fact:  Waiting for hot water sends millions of gallons of cold water down the drain.  On a average family of 4 will waste 14,000 gallons of water each year waiting for hot water.

Trade off?  You bet – make your decision on which makes the most sense for you.

Does A Domestic Hot Water Recirculation System Really Save Energy??

Regardless of whether they are controlled manually or automatically, recirculation systems reduce the amount of water that goes down the drain while the homeowner waits for the desired temperature.

There are two major advantages of a recirculation system:

  • Time Saver:  A recirculating hot water system delivers hot water to a faucet fast.
  • Conserve Water:   1.3 trillion gallons of water is wasted nationally by households per year while waiting for water to heat up. [U.S. DOE statistics]

Domestic Hot Water Recirculation System provide instant hot water comfort, save water and energy.  A standard domestic hot water recirculation system requires a dedicated return line from the furthest fixture back to the water heater.  So adding a  domestic hot water recirculation system after a house is finished is harder than doing it when built or going through a major renovation.

This dedicated return line is connected to a tee at the tank drain valve or to the tank’s cold water supply line.  

A recirculation pump with an optional Integral Flow Check (IFC) is installed on the return line and controlled by a timer or temperature aquastat. The spring-loaded IFC prevents gravity circulation during off-cycles. The timer turns on the pump at preset intervals, usually during peak use periods. An optional Aquastat operates the pump to keep hot water in the line within a set range (95°F–115°F).

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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