Model # 500800

Internet #100426993

Store SKU #396787

null Hot Water Recirculating System with Built-In Timer

Hot Water Recirculating System with Built-In Timer

  • Quiet, maintenance-free operation
  • Includes all parts needed for installation
  • Works on any system without additional piping
$199.00 / each
If you buy 3 or more
$179.10 / each

Frequently Bought Together

Product Overview

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
  • Click here for more information on Electronic Recycling Programs

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.




Warranty / Certifications

More Products With These Features


Customer Questions & Answers

I have had this installed but I am getting too much warm water out of my cold faucets. How do I adjust so cold comes out the cold faucets?

Asked by: Frustrated
If the pump stopped pumping once hot water reached the sink this wouldn't be a problem. These systems utilize a Normally Open thermostatic valve that closes only after 94F water contacts the valve. Once closed the valve won't open until heat loss occurs in the hot water pipe dropping the temperature below the valves specified temperature. This results in 93F water entering your cold water line at the same rate at which heat is being lost through convection in your hot water lines. There is a video on youtube showing that's normal to wait as much as 80 seconds for cold water at taps which have these valves installed.
Answered by: SteveO
Date published: 2017-05-13


Asked by: BKLYNDOG
I think the fellow who indicated "convection" has a point. In an instance where the hot water is required, say a kitchen sink, is higher in elevation than the hot water heater and they are directly connected by the addition of a dedicated line back to the water heater, then water should flow through the circuit due to thermal convection. Cold water is more dense than hot water and would like to flow downwards while at the same time the hot water would tend to rise. The resulting differential in pressure is very low and dependent on the height difference between the two points and the pressure drop through the pipe. Thus the efficiency of this would be increased by a greater height difference and larger supply and return lines.
Answered by: Jules
Date published: 2017-01-27

can this pump be used with tankless hot water heaters?

Asked by: GeorgeM1
Answered by: AR
Date published: 2017-01-22

Does this unit heat up the water in the toilets?

I was wondering if this unit causes issues with warm water in toilets?
Asked by: luckydog777
Ha!!! don't I wish... the answer is no... the hot water needs a to and from loop to circulate... the toilet is a single (to) pipe so there is no return for the hot water to go back to the tank... you would have to flush a LOT to get warm water to the toilet!
Answered by: totem12
Date published: 2017-05-15
  • y_2017, m_6, d_23, h_4CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_199
  • loc_, sid_100426993, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 100ms

Customer Reviews

Hot Water Recirculating System with Built-In Timer is rated 4.3 out of 5 by 331.
Rated 5 out of 5 by from The quality was good, instructions easy, works as it says. Minor Con: Pay attention to instructi... The quality was good, instructions easy, works as it says. Minor Con: Pay attention to instructions though, if there is more than 1 loop of piping in your house you will need to buy another valve kit, no big deal really, but you need to get it if you want the full benefits of have almost instant warm water at all locations. Benefit: I ended up turning my water heater temperature way down because the pipes stayed warm allowing the water (when used) to not dissipate as much heat, those cold pipes (I have copper) make a huge impact on the water temperature when it reaches the fixture. Minor Con: I did lose pressure in 2 sinks and a shower after hooking up the unit. Turns out that the recirculating of the water must have kicked-up a lot of debris which got caught in the smaller orifices and screens. I just disconnected them and blew them out. Now my pressure is much greater than before, so it needed to get done regardless. No reason not to have one of these, especially if you are waiting more than 20 seconds for warm water.
Date published: 2017-01-04
Rated 5 out of 5 by from It is truly wonderful to be able to wash your hands in warm/hot water without having to wait. Th... It is truly wonderful to be able to wash your hands in warm/hot water without having to wait. This pump really does the job. For easier install get slip on connector mentioned below, easy install with no waiting for cure time. "SharkBite 3/4 in. Push-to-Connect x 3/4 in. FIP x 15 in. Braided Stainless Steel Water Heater Connector" I had to add an additional connection under the sink on the other side of the house. One thing to be aware of is that the connection under the sink will emit a fairly quiet water flowing noise. The first time I heard it, I thought a toilet was running.
Date published: 2017-03-28
Rated 4 out of 5 by from Getting Hot Water Fast This is the quickest way to get hot water to those remote parts of your home where you do not have a dedicated return line. The installation instructions are good. Depending on water quality, and I am using a water softening system, and how many hours you have the pump programmed to run (mine runs at two different times for a total of ten hours), expect to replace the sensor valve anywhere within 18 to 24 months. Minerals in the water build up in the sensor over time. You will know it is time when you either don't get hot water out of your faucet fast enough, or if using the cold water side the water stays warm for an unusually long time. I would have rated the product at five stars for convenience, but having the sensors clog up over time is the only inconvenience, which is not a fault of the product.
Date published: 2017-02-01
Rated 4 out of 5 by from Instant hot water I find the system to work very well in almost every occasion that I have installed it. The one problem I find is the cost of additional sensors at over $65 with tax and the time it takes to go get them and quite often Home Depot does not handle the sensor separately. I have run into very few problems installing the system but find that older homes do not do as well as newer homes with the system. I have one on my house and have installed the unit on several of my friends homes all they can talk about is how wonderful it is to have hot water almost instantaneously at their shower especially during drought times
Date published: 2017-01-17
Rated 4 out of 5 by from Great system Have this installed for about 10 years. Works great. Not sure how much we saved, but it was nice having hot water fast in the am. Had to remove it as it developed some kind of harmonic oscillation. With a downsized family, we won't replace it. That being said, pretty easy to install and set. Well worth the money.
Date published: 2017-02-19
Rated 4 out of 5 by from Easy install, works great Easy to install and works great. Just make sure that you have proper tubing to connect to it. I had to buy a 18 in flex tube with a shark bite connection to connect to the plastic tubing(new house built in 2015)for the hot water supply line that runs through the house.
Date published: 2016-12-27
Rated 4 out of 5 by from I am using this product for about a week now and it seems to work fine. The only minor thing is t... I am using this product for about a week now and it seems to work fine. The only minor thing is that on any faucet the cold water for the first minute or so comes like Luke warm and gradually cools down.
Date published: 2017-02-28
Rated 5 out of 5 by from This product did as advertised. My only regret, I did not purchase this sooner. Very easy to inst... This product did as advertised. My only regret, I did not purchase this sooner. Very easy to install. I cannot believe the difference in the time and water wasted before I installed this device.
Date published: 2017-01-31
  • y_2017, m_6, d_23, h_11
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_331
  • loc_, sid_100426993, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 111ms