Internet #301852244

Model #RH18537

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

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

Frequently Bought Together

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Price:
$49068

Product Overview

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.
  • 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
  • California residents

Info & Guides

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Specifications

Dimensions

Product Depth (in.)
7.75
Product Height (in.)
9.25
Product Width (in.)
10.5

Details

Compatible Brand/Model
Select Rheem Gas Tankless water heaters
Finish Family
Gray
For Use With
Gas Tankless
Material
Metal
Pack Size
1
Product Type
Recirculating Pump
Product Weight (lb.)
8.4
Returnable
180-Day

Warranty / Certifications

Manufacturer Warranty
3 Year Limited

Questions & Answers

23Questions22Answers

Will be installed under the kitchen sink. Where would you attach the hot water outlet for the dis...

Asked by ERC February 24, 2021
2
Answers

Super happy with the unit, wife is finally happy that we get hot water to kitchen sink within 10 seconds.

Can this be used if you have a regular water heater, i e. not tankless?

Asked by WoodHen February 22, 2021
1
Answer

Good day WoodHen, Thank you for contacting Rheem. Yes you can use this pump with a regular heater.

I have two bathrooms at opposite locations in my house. Will this pump work with both a manual pu...

Asked by ProudVet October 29, 2020
2
Answers

Yes. I have both the push button and the wireless transmitter. The range on the wireless is pretty short. I have found that using it with a smart plug and Alexa works also. you can set timers for your schedule and use a verbal command to start the pump. To start the pump you need to turn if off and back on.

Will this work with a Rheem Electric Tankless Water heater?

Asked by Josh October 26, 2020
2
Answers

Thank you for asking. Please contact us directly for assistance 877-474-6473.

Does the Maximum pipe length 100ft with 1/2 in. pipe refer to the one way length or the whole loo...

Asked by Onceupon September 3, 2020
1
Answer

Hello OnceUpon, Thank you for asking, in that diagram they are referring to is the full loop there and back.

Where is the link or SKU for the wireless remote kit That can be used with this pump system? I’d ...

Asked by WirelessRemote June 20, 2020
1
Answer

Thank you for asking, WirelessRemote. The Wireless Remote Kit can only work with the On Demand Pump Kit (AP18403) and the Wireless Remote is Part# SP20861, which can be purchased at Parts.Rheem.com. If you have any further questions, please contact us at 1-866-720-2076. Thank you and have a great day.

does using the the water recirculating pump change the water temperature on the cold water side? ...

Asked by Dom April 5, 2020
3
Answers

Thank you for asking, Dom. We would suggest to discuss the installation and connections to your cold water line with a plumber. If you have any other questions, please contact us at 1-866-720-2076. Thank you and have a great day.

can water temperature be adjusted from incoming before pump shuts off

Asked by adjustment February 8, 2020
3
Answers

The hot water (obviously) is pulled from your water heater and doesn't shut off until the unit senses that hot water has arrived. In my experience, the pump pulls water through your pipes much faster than if I just run the faucet on full-hot using your municipal water pressure (and I have a 1" pipe) so you'll get hot water sooner than you're used to. Once hot water has arrived at the unit, it will shut off and you can then open the hot water tap. There is no benefit to running the tap before the hot water arrives. When you open the tap, that's when your faucet's mixer determines the temperature of the water that comes out. If you never use full-hot water, you should think about setting your water heater to a lower temperature level.

I notice a activation button comes with unit. Do you have to use the button to activate unit or ...

Asked by how February 8, 2020
5
Answers

I turned this pump into an automatic unit whenever someone turns on the hot water. I used a GEMS FS200 flow switch, installed before the water heater, which energizes the outlet this pump is plugged into when anyone in the house turns on the hot water. It pump automatically shuts off when the water is warm enough. Works fantastic, with no pushing the buttons. Gems flow switch works like a light switch, flipping it on when water is flowing, shutting it off when no water is flowing. Wish TACO/Kohler would just build this feature into the pump, so I didn't have to by a flow switch, run a line to the outlet under the sink.

How long are the power cable and the line for the button?

Asked by Jeff February 4, 2020
2
Answers

Thank you for asking, Jeff. The Power Cord is about 1 foot long and the wiring for the button is about 4 feet long. If you have any further questions, please contact us at 1-866-720-2076. Thank you and have a great day.

1/25 HP Hot Water Recirculating Pump with Under Sink Kit - page 2

Customer Reviews

  • 4.3
    out of 34 reviews
  • 88% recommend this product
5star-icon22
4star-icon7
3star-icon0
2star-icon2
1star-icon3
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Showing 1-10 of 34 reviews
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 TacoRecirc
10 people found this helpful
Super easy installation. Wife is finally happy for resolving hot...
Super easy installation. Wife is finally happy for resolving hot water issue.
by ED
by SCOT
Works perfectly. Delivers hot water to the whole house in...
Works perfectly. Delivers hot water to the whole house in about 10-15 second, rather than 2-3 minutes before.
by Tom
So far so good. Still getting used to...
So far so good. Still getting used to it but we seem to have warm water on demand.
by BOB
The pump works well and does get hot to the...
The pump works well and does get hot to the shower very quickly. It is also extremely quiet. The accessories did not work for me. I needed to make a different tee. The fitting on my sink were not the compression type. The hoses were a too short and stiff for a clean installation in the cabinet.
by BEN
Works great! Only take 50 seconds compared to 3-4 mins...
Works great! Only take 50 seconds compared to 3-4 mins to get hot water. Shower is 60 feet from hot water tank. Wife loves it and as they say “Happy wife, happy life”
by HappyHusband
Product as advertised. Still takes around 35-40 seconds for pump to deliver hot water from tankle...
Product as advertised. Still takes around 35-40 seconds for pump to deliver hot water from tankless water heater to most remote tap in house but at least not watching water run down drain while waiting.
by JCR
Expensive but works well and is relatively quiet. Easy...
Expensive but works well and is relatively quiet. Easy to install (if you have an electrical outlet nearby)
by HAROLD
Does not work well with tankless water heater...
Does not work well with tankless water heater
by BRUCE
Showing 1-10 of 34 reviews