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  Hot Water Recirculation - FAQs

Frequently Asked Questions





What is hot water recirculation?
Hot water recirculation is the process of constantly recirculating water in a continuous hot water pipe loop through the water heater so there will be no wait for the water to warm up.
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How does the water remain hot in the pipe?
The pump attachs to the water heater and constantly circulate water through the heater into the “hot” pipe loop in the house, so the water in these pipes is always hot.
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What is the average cost to install a HWR system in new homes?
For the average home, hot water recirculation systems generally cost less than $1,000, including parts and installation.
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How much does it cost to operate?
The HWR uses a 2-pole motor for low energy consumption. Energy costs will vary according to local rates. The HWR pump uses between 55 watts on small UP models and up to 85 watts per hour on larger models. The average annual cost to operate the pump will be less than $20 per year.
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How does this system ensure water resources are used most efficiently?
The system conserves water by providing hot water immediately – as soon as the hot water tap is turned on – and prevents the unnecessary waste of gallons of cold water down the drain with the ultimate convenience.
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How much water will the pump save?
The average household wastes 27 - 105 gallons of water per day waiting for hot water. That adds to more than 12,000 – 38,000 gallons of water saved annually per installation, depending on the size of the water pipe and the frequency of use. There is also an indirect benefit to communities where HWR is in wide use because of reduced wear and tear on municipal wastewater treatment facilities.
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Can the pump be used on both gas and electric water heaters?
Yes.
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Can the system be installed in any home? Yes. The HWR can be installed in any home or building, however, the installation is a bit different for new construction versus retrofit. [Back to Top

Are the materials used to make the supply pumps safe – and won’t contaminate the water?
The pumps are made of stainless steel for corrosion resistance - and are thus safe.
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How frequently will the pump need to be changed?
The pumps have built-in motor protection for long life and the life span is estimated at 10 years.
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How will the pumps be serviced?
No service is required. Should the pump fail while under warranty, it will be replaced.
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Is this system approved by the building industry and where can I purchase it?
Grundfos pumps are rated or approved by several agencies worldwide. UL, CSA, cUL and CE are the most common approvals. Dealers throughout the U.S sell GRUNDFOS HWR pumps. For the dealer nearest you, call 1-877-WTR-PUMP.
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As demand for hot water and efficient use of water increases, will systems like this become commonplace?
Yes. With water conservation issues increasing in importance, and significant population growth estimated over the next 20 years, water is becoming a precious resource. At some point, it is likely that these types of recirculation systems will be installed in every new home as a standard.
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Can this system be used in commercial buildings as well as for housing?
Yes. This system can be used in any type of building.
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Are there different models of this HWR pump available?
Yes. Depending upon the application, the basic models are UP15-10, UP15-18, UP15-42, and UP25-64. These models are available in constructions of bronze or stainless steel with optional timer and line cords.
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