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Model # 500800

Internet # 100426993

Store SKU # 396787

Hot Water Recirculating System with Built-In Timer

This item has been discontinued.
The Home Depot no longer carries this specific product.

$199.00 /each
  • Quiet, maintenance-free operation
  • Includes all parts needed for installation
  • Works on any system without additional piping




Model # 500800

Internet # 100426993

Store SKU # 396787

Never wait for hot water again. The Watts Hot Water Recirculating Pump provides hot water at every faucet or shower when needed, eliminating wasted water. It is easy to install on any water system and requires no additional piping. The unique design of the pump ensures quiet, maintenance-free operation. The system includes a built-in 24 hour, dual setting programmable timer to activate the pump only when needed.

California residents: see  Proposition 65 information

  • Conserve water up to 15,000 Gal. of water per year
  • Save money up to 10% of your water bill
  • Maintenance free
  • Easy to install in less than 1 hour
  • Includes everything you need- pump with timer and 10 ft. electric cord, two adapters with rubber washers, valve mounting screws, sensor valve, two 12 in. supply lines
  • Additional sensor valves available for homes with multiple plumbing loops

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Finish Family 
Product Type 
Recirculating Pump 
Product Weight (lb.) 
6.95 lb 
Warranty / Certifications
Manufacturer Warranty 
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. 


Rated 4.2 out of 5 by 185 reviewers.
Rated 1.0 out of 5.0 by Instant Hot Water Recirculating System can't see this working very well ,,,the distance from the water tank to the tap is still the same ,,,all that is happening is the water is pushed thru the water pipe with a circulating pump possibly moving it faster due to more water pressure ,it is still the same amount of water ,,,if you think it is worth the cash ??? April 4, 2014
Rated 4.0 out of 5.0 by Should have installed this a long time ago. The builder of our home put the HW heater in the garage and the master bath and kitchen on the other side of the house. We would need to run the what for over 1 minute to get HW. It took me less than 30 minutes to install the HW Heater pump (you need to pre-measure and pre-plan your hook up). It took 45 minutes to install the under-sink bypass manifold. Mounting the bypass manifold was not an option because of space restrictions; I left it hanging and it is working just fine. It was so nice to wake up this AM and wash my hands in warm water. February 22, 2015
Rated 5.0 out of 5.0 by Love having instant hot water I love having hot water at every faucet. It is a simple install as long as your hot water heater is in an open area and you don't have to do any of the plumbing re-work. Mine had a little re-working that needed to be done, but it didn't take too long. Great product - not sure if I have saved much on the water bill yet, but not having to wait for minutes at a time for hot water = priceless. December 11, 2014
Rated 5.0 out of 5.0 by Warm water instantly Happy with the pumps ability to provide warm water at the kitchen sink. It is easy to install if you are a handy person. The only drawback is getting warm water out of the cold side initially. My wife didn't care for that so I bypassed the cold water feed and ran a return line back past the point of the cold water feed into the house. Now everyone is happy. I only set the timer for times that we ordinarily use the kitchen sink water so the pump doesn't have to run much. Like it a lot. Hard to tell if it has effected my gas and power bill much. January 21, 2015
Rated 5.0 out of 5.0 by Love the Concetpt - Simple Yet Effective Just installed this unit a day ago and it is working perfectly. It took me about an hour and a half to install. Very straight forward and easy. In fact, when I removed the original nipple from the outlet of the water heater I discovered it had a lot of mineral build up which has now help improve the water flow. I like most people was frustrated watching precious water go down the drain waiting for it to get hot. I just learned about these products a few weeks ago from a radio home improvement guy. The concept and design is so simple yet effective that I don't know why all houses aren't built with these. Or, at least all new water heaters should already have one installed on them. To any contractors out there that either build houses or install water heaters, don't assume your customers know about these. Do yourself and your customers a favor and let them know about these recirculators. I suspect you'll end up selling a lot more of them. In these days of water rationing especially here in the Southwest and in California. This is a simple, effective and cheap way to save water and some money. May 7, 2015
Rated 5.0 out of 5.0 by A Good Purchase so far. I do not have a lot of skills with plumbing. With the severe CA drought , I like to do my part in saving water. The pump, costing $189 plus electricity may not have a very good payback, but definitely should help with saving water. After reviewing a number of articles, product reviews and YouTube videos, I decided to buy this product. I installed it in about two hours. Good: ** Product comes with everything I need, except a little teflon tape that I have to buy separately. ** I found the Watts manual to be very useful and descriptive with easy to follow instruction. This is true especially with the part about how to handle the hot water heater before installing the pump. ** The timer as part of the system is very useful. I set it to be ON except from 11pm - 7am. So I do save some electricity not running 24 hours. I know some of my friends who have water recirculating pump have a on/off switch. They told me they turn the system on 10 - 15 minutes before taking their showers, and then turn it off. This is so inconvenient. I do not think the pump will use a lot of electricity. So with the built-in timer, I can have the convenience of having hot water whenever. Bad: ** So far, since I just installed the system (April 15, 2015), none. Hope the system will work for years. I read some reviews about the pump going bad after a few months or a couple of years. Will see. Hope the by-pass temp sensing valve will last as well. I am very happy with the purchase. April 28, 2015
Rated 4.0 out of 5.0 by This fixed a need! Surprisingly easy to install. Gives me the desired hot water. Only drawback I see is that I have to set the timer every time my schedule changes and that's every day or two. But at least NOW I can have hot water in my bathroom!! February 5, 2014
Rated 5.0 out of 5.0 by Wish Had I bought If Earlier The hardest part of the job is doing minor replumbing at the hot water heater to accept the pump assembly. The under sink was really easy to do and did not take up any extra storage I had under the sink. If You are not handy you might need a plumber to do the hot water heater hookup. The electric cord is ten feet so you may have to have electricity run to it as well. I was lucky and had a plug right next to the hot water heater. This thing really works and saves water! My shower literally took three and one half minutes to get hot water. That was seven gallons of water! When the pump is turned on, I now get hot water in six seconds, and the water is hotter than when the pump is not running. Power consumption is only 25 watts, so it does not do in your electric bill either. I am really happy I bought this system. I would do it all over again. June 9, 2015
  • 2015-11-26 T10:58:48.010-06:00
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