The second type, called a comfort system, is cheaper and a much easier choice for existing homes, says Griccino. The unused heated water runs back through the cold water pipes. Since it uses the same pipes for warm and cold water, there’s one major drawback: It takes longer to get cold water. A system with a temperature sensor can correct this problem.

How does a hotwater recirculating pumpwork

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According to the National Resources Defense Council (NRDC), studies suggest that “over 10 percent of all the hot water drawn for showering in a typical single-family home is wasted waiting for hot water to arrive.”

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A thermostatic mixing valve operates by sensing the temperature of the blended water and adjusting the seat in the mixing chamber accordingly. If the cold supply water suddenly drops in pressure the seat will close, limiting the amount of hot water allowed to pass through.Types of mixing valvesSource of supply – Residential, commercial, industrial uses for tempering entire hot water distribution systems.Point of use – residential, commercial and industrial uses, easily installed between the fixture supplies.Temperature actuated flow reduction valve – Immediately closes in the event of a lose of cold water protecting you from being scalded. Used primarily to control the high limit water temperature of showers.Tempering valve – Blends cold and hot water to extend the hot water capacity of residential water heaters and boiler coils.Pictures used with permission from Watts.com

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When you turn on the tap, how long does it take to get hot water? Letting it run can waste money and water, not to mention time and patience.

One solution ensures you’ll never have to wash your hands in cold water again: a hot water recirculating pump. These handy devices are game changers.

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Sizing Tool ; Minimum system temperature. °F ; Total volume of fluid in the water heater · Minimum system temperature. °F ; Drawdown (tank must supply) · Minimum ...

How much money does a hot water recirculating pump really save? While it can save some, it’s mostly for convenience. “In 12 months, they can save you roughly $120,” says Griccino.

A hot water recirculating pump attaches to your water heater. It circulates hot water throughout your pipes to keep it readily available at the faucet. It’s affordable and doesn’t waste water. (Psst! Here’s how to save money this winter on your energy and water bills.)

Hotwater Recirculating pumpwith temperature sensor

Griccino says a hot water recirculating pump costs about $200, and many comfort systems can be DIY installed. Better to go with professional installation if you need new plumbing.

A recirculating pump is relatively affordable. So even if you save less than $120, it can still pay off quickly. The time saved might be enough to justify the initial cost, even without a major reduction in utility bills.

Hot water recirculating systems need little maintenance. Keep an eye and an ear out for leaks or unusual sounds. If you do run into a problem, Griccino says call a plumber immediately. Barring any malfunction, you should get about 10 years of use from the pump.

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A mixing valve; also known as a tempering valve, is a mechanical thermostatic valve designed to control the water temperature output through the valve. Many areas require thermostatic mixing valves be installed on the domestic hot water supply; by code, for the protection of the residents.

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“The recirculating pump costs about the same as operating a 25-watt light bulb,” says Umberto Griccino, a commercial plumber and HouseGrail consultant.

Hotwater recirculating pumpwithout return line

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There are two main types. One requires an additional plumbing line to send unused water back to the water heater after it drops below a set temperature. The other returns the unused heated water via your existing cold water pipes.

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To save more water, combine a hot water recirculating pump with water-efficient appliances and fixtures. A dual-flush toilet and efficient shower head go a long way toward cutting utility bills.

DIYers should install the pump near the water heater and power source, and the sensor valve at the fixture furthest from the heater, Griccino says. Turn off and drain the water heater before beginning work. If you’re unsure about your DIY plumbing ability, contact a pro.

Many systems turn on and off automatically to keep the water within a specified temperature range. Others run on a timer. Both options use less energy than a continuously-running system.

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The first type is best for new construction. Along with the usual hot and cold lines, a plumber will install a third pipe to return the unused hot water, usually between the water heater and the furthest fixture. A full system like this is expensive and difficult to install in an existing home.

Much of the water sitting in those pipes was once heated. Without a recirculating pump, it’s left in the pipes to cool. That’s a lot of water, energy and money down the drain.

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