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Internet # 301852244

Model # RH18537

1/25 HP Hot Water Recirculating Pump with Under Sink Kit

$566.00
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  • On-demand hot water where you need it
  • Compatible with Rheem Tank and Tankless Water Heaters
  • Easy under sink installation
  • View More Details

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Product Details

About This Product

Rheem's under the sink, on-demand recirculating pump kit provides instantaneous hot water where you want it and when you need it. As a bonus, this kit helps save up to 12,000 Gal. of water per year by reducing the amount of water running down the drain while waiting for hot water. This under the sink option is a perfect solution for adding instant hot water to an existing water piping application. Application - This model is perfect for retrofits and new construction. Engineered for use with all Rheem Tankless and Tank Type water heaters.

Highlights

  • Install location - the pump unit installs under the sink cabinet of the fixture furthest from your water heater
  • Activation - wired push button included
  • Plumbing requirements - uses existing cold water supply pipe as the return line - no dedicated return line required
  • Compatibility - tank-type and tankless water heaters
  • Easy installation
  • Kit includes - pump, wired push button, 2 tee fittings, 2 corrugated flex tubes, piping diagrams and instructions
  • Maximum pipe length with 3/4 in. pipe is 400 ft.
  • Maximum pipe length with 1/2 in. pipe is 100 ft.
  • Motion sensor or remote transmitter activation kits sold separately
  • Durable cast metal construction
  • Call 1-855-400-2552 before noon for same-day installation service in most areas, or visit our Water Heater Installation page for more information.
  • Click here for more information on Electronic Recycling Programs
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Product Information

Internet # 301852244

Model # RH18537

Additional Resources

Shop All Rheem

Specifications

Dimensions: H 9.25 in, W 10.5 in, D 7.75 in

Dimensions

Product Depth (in.)

7.75 in

Product Height (in.)

9.25 in

Product Width (in.)

10.5 in

Details

Finish Family

Gray

Material

Metal

Pack Size

1

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

3 Year Limited

Questions & Answers

I have a RUUD PROUH65 T2 RU375 - 15 heat pump water heater. Can this product be used with this water heater?. Is there any special instructions for installing with a heat pump water heater? Thanks
ByDec 10, 2025
1 Answer | 
Answer This Question

Hi, Hybrid water heaters use proprietary software to ensure the water heater operates at peak efficiency. The heater uses an algorithm to determine when the unit should begin a heating cycle. A typical heating cycle is caused due to a sudden drop in temperature at the bottom of the tank when the hot water is being used and the incoming water temperature is much cooler than the water in the tank. Because a recirculation returns warmer and sometimes hot temperatures back to the water heater, it can act against the programming of the hybrid unit as the inlet water temperature may not be cool enough to activate a heating cycle. This conflict often renders running the unit in Energy Saver mode ineffective and other higher power consumption modes will need to be utilized instead. Derius

By|Jan 13, 2026
    0/0

    (1)

    Is it suitable for Radiant floor heat?
    ByJan 5, 2025
    1 Answer | 
    Answer This Question

    Rick, To verify proper application usage, please contact 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST at your earliest convenience. Derius

    By|Jan 6, 2025
      0/0


      Do they have a remote for the Rheem recirculating pump system?
      ByDec 31, 2024
      1 Answer | 
      Answer This Question

      Jeff, Based on the information you have provided, the kit you have inquired about does not come with a remote. Derius

      By|Jan 7, 2025
        0/0


        Hot water heater in the middle of house kitchen 1 way bathroom other way how will it work 1 line goes to kitchen 1 line goes to bathroom
        ByJan 7, 2024
        2 Answers | 
        Answer This Question

        Might want to use two units, one for each line.

        By|Mar 20, 2024
          0/0

          Hi Julius and thank you for your question. For installation of recirculation, please contact your local plumber.

          By|Jan 13, 2026
            0/0

            (2)

            what is the flow rate of this pump
            ByJan 6, 2024
            1 Answer | 
            Answer This Question

            Hi James and thank you for your question. Please call 1-401-942-8000.

            By|Aug 22, 2024
              0/0

              (1)

              Does this pump automatically shut off when hot water is sensed? Also what is the part number for the remote, and what is the range of the remote, meaning how close to the pump must I be?
              ByDec 26, 2023
              1 Answer | 
              Answer This Question

              Hi Jaybo and thank you for your question. Please wait for hot water temperature to cool below 100°F (approximately 20-30 minutes). The parts: SP20861 Wireless Remote Transmitter / SP20862 Motion Sensor Kit

              By|Jan 12, 2025
                0/0

                (3)

                Can the valve be at the cold water inlet of the water heater
                ByDec 22, 2023
                1 Answer | 
                Answer This Question

                Hi Steve and thank you for your question. Typically, this would be at the fixture farthest away from the water heater, generally the kitchen or master bathroom. Please speak with an installer / plumber for assistance.

                By|Mar 31, 2024
                  0/0

                  (1)

                  I noticed that Rheem pump doesn’t have the LED light on the top cover like the Taco version of it. That light is on when the pump operates. How can you determine when the pump is on other than making the noise while operating?
                  ByNov 29, 2023
                  1 Answer | 
                  Answer This Question

                  Hi Cosmo and thank you for your question. If it does not have the led then you would need to listen for it to be on. For technical issues, please call the number on the unit or in your user manual.

                  By|Jun 13, 2024
                    0/0


                    Viewing 1-8 of 52

                    Customer Reviews

                    4.2 out of 5

                    • 4.2 out of 59 reviews
                    • 71% recommend this product
                    Filter by:
                    Showing 1-10 of 59 reviews
                    It does what it is supposed to - It’s worth it
                    This recirculating pump is definitely worth it. I was a little unsure how much difference this could make, it works really well. We installed an on demand water heater in our old house. It took a long time for the farthest faucets to get hot water. This is installed under the kitchen sink. It not only brings hot water to that faucet much quicker, but it also makes hot water available at all of the faucets in the house significantly quicker than before.
                    by
                    • Verified Purchase
                    • Recommended
                    1 found this review helpful
                    I installed this in our master bathroom vanity sink area. Before I had this, it would take severa...
                    I installed this in our master bathroom vanity sink area. Before I had this, it would take several minutes running the water before the hot water would arrive at the shower, wasting a lot of water. Now, I push the button, and after a few minutes, the pump stops and the water arrives in the master shower within 5-6 seconds. I created a YouTube video after installing it if you want to see the results. This is a super high quality, easy install for DIU homeowner with basic skills. https://www.youtube.com/watch?v=NqfhvFCCdQI&t=11s
                    by
                      • Recommended
                      17 found this review helpful
                      Extra energy expense
                      Just be prepared for the extra energy cost to keep the water hot. Ours works as advertised but cost and additional $60 a month in gas for the water heater. Nothing is free.
                      by
                        This customer chose to rate the product and not provide text.
                        by
                        • Verified Purchase
                        Had to return the first pump I had purchased. It appeared that the temperature sensor on the pump was not working therefore the pump would never shut off even when the hot water had reached it. Had to purchase a second pump and install it which is now working properly.
                        by
                        • Verified Purchase
                        Kit had all parts needed for a quick and easy...
                        Kit had all parts needed for a quick and easy install. I run it through an Alexa enabled plug in my kitchen. It provides hot water in less than 2 minutes run time. Before installation I had to run through about 3 gallons of water before my tankless water heater would provide hot water at the tap.
                        by
                        • Verified Purchase
                        Works good. Hope it lasts...
                        Works good. Hope it lasts
                        by
                        Response from RheemMar 10, 2023
                        Hello,

                        Thank you for the 4-star review! If you ever need assistance or just have questions about your water heater, feel free to reach out to our Technical Support Team at 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST and one of our experienced analysts will be happy to assist you. Thank you for choosing Rheem!

                        Isaiah rheem
                        • Verified Purchase
                        Best and practical invention
                        That’s a great and practical idea that the entire household can use and don’t have to be tied up in one persons phone to control the system..
                        by
                        • Verified Purchase
                        I prefer the push button on demand option. Hot water...
                        I prefer the push button on demand option. Hot water in 30 seconds.
                        by
                        • Verified Purchase
                        Buy your own "tees"
                        Buy 2 brass 1/2" male thread tees. Run the 1/2" supply line from the angle/strait valve to 1 male, run the pump supply line to 1 male, buy a 1/2 FIP X 1/2 FIP X 20" supply line and run it from the final male and up to the sink. Now you have a functional system isolated and shut off using your existing angle/strait valves!!! Soo much simpler/easier!! The really hard (or just tricky) part is providing power to the pump. Most lav/vanities in bathrooms have no power receptacles inside them.
                        by
                          Showing 1-10 of 59 reviews