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Watts 500800 Hot Water Recirculating System with Built-In Timer

4.4 out of 5 stars 503 customer reviews
| 194 answered questions

Price: $187.11 & FREE Shipping. Details
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Ships from and sold by Amazon.com. Gift-wrap available.
Include installation | Estimate $193.95 | ZIP
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  • Service provided by a local pro
  • Removing old pump unit
  • Installing 1 pump in existing pit
  • Connecting pump to power outlet and discharge line
  • Testing for proper functionality
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Estimate: $193.95
89% positive ratings (9 reviews)
    This fits your .
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  • Conserve Water - Up to 15,000 gallons of water per year
  • Save Money - Up to 10% of your water bill
  • Maintenance Free
  • Easy to install in less than 1 hour
  • Includes: Pump with timer, 2 adapters with rubber washers, valve mounting screws, sensor valve, two 12-inch supply lines
30 new from $169.36 3 used from $86.06

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$187.11 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Watts 500800 Hot Water Recirculating System with Built-In Timer
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  • Grundfos 595926 Replacement Comfort Valve for UP Circulator Pumps
Total price: $302.82
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Color: Blue
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Technical Details

Color: Blue
  • Easy to Install

Product Description

Color: Blue

Product Description

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

From the Manufacturer

The Watts Premier hot water recirculation pump puts hot water at every tap when you want it. Saves up to 15,000 gallons per year. The pump brings convenience and savings to your home, giving you hot water instantly at every faucet, when you need it. This unique product is easy to install and not only provides you with the convenience of hot water when you need it, but saves an average of over 11,000 gallons per year. *May not work with a tankless water heater.

Product Information


Technical Details

Part Number 500800
Item Weight 8.5 pounds
Product Dimensions 6.2 x 6 x 5 inches
California residents Click here for Proposition 65 warning
Item model number 500800
Size full
Color Blue
Voltage 120 volts
Item Package Quantity 1
Number Of Pieces 1
Special Features Easy to Install
Batteries Included? No
Batteries Required? No
Warranty Description 1-Year Limited Warranty

Technical Specification

Additional Information

Customer Reviews
4.4 out of 5 stars 503 customer reviews

4.4 out of 5 stars
Best Sellers Rank #7,056 in Home Improvements (See top 100)
#7 in Home Improvement > Rough Plumbing > Water Heaters & Parts > Water Heaters
#12 in Home Improvement > Rough Plumbing > Water Pumps, Parts & Accessories > Sump Pumps
#585 in Home Improvement > Contractor Supply
Shipping Weight 6.9 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available January 1, 2008

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Color: Blue
I bought the Watts Premier hot water recirculating system and let me tell you it works great! I did not notice my gas (heating) bill going up significantly at all. It was well worth the investment as far as I am concerned for convenience and saving water.
The only negative thing I can say about it is that the remote stop valve did fail. There was not a whole lot of information about this problem with this system to be found, even on the internet, so I didn't know what was going wrong at first. But slowly it seemed like there was a lot of hot water on the cold side when we turned the cold water on. It was more and more as time went on. And the valve became noisy and sounded like water was going through it all the time. I finally called Watts customer service. After being on hold for a half and hour, I talked to a rep who confirmed to me that the stop valve was failing. They were willing to send me a replacement, but I had to either send the old one back first or pay for one and get a credit after I sent the old one back. They said they are very strict about this because there is only a one year warranty on the valve and people were always calling in trying to get a free replacement after the valve failed or get extra valves when needed.
Because he didn't sound very concerned, I then asked if this was a common problem and he admitted then that YES the valves do inevitably fail. It could be 6 months or a year or two years, three years.... who knows? But they do fail and it's just a matter of time. They really aren't made to last very long. But they are made to last at least a year- long enough to expire the warranty period.
They don't tell you that when you buy it, of course and it doesn't say it in the manual.
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Color: Blue
I don't know why few stores carry this and few people are aware of this great product, including those sales persons in home improvement stores. It gives instant warm water to all the rooms in your house, it saves 10,000 gallons water a year (really, I measured and calculated) and it is so easy to install.

Doubt about if it really works? Try this: go to the farthest faucet in your house and open the hot water. Once the water becomes hot, close it, but not fully, leaving a very small stream. Now go to other faucets and open hot water, you bet, instant hot water! It'll keep this way as long as you keep that small stream flowing.

The problem is that small stream goes wasted. How about recycle it into the hot water heater? Sure, but how? The hot and cold water lines have the same pressure, therefore water cannot go from the hot line into the cold line. What if I add a pump into the hot line? Exactly, that's what this Watts product does. Problem solved.

For a practical and fine product, Watts also add a temperature sensor, so the recirculation only happens when the hot line becomes not so warm. This, plus the stream is really small, adds very small extra energy cost to the heater.

The pump is very small, only 25 watts, using less electricity than a lighting bulb. There is also a 24-hr timer (in 15-minutes increments), allowing you to shut the entire system off during the periods when you do not use warm water, such as sleep and work times. This reduces even further the already very small added energy cost. BTW, the pump is thoroughly quiet, no audible noise at all.

An alternative product is the Laing Autocirc. It is a single piece can all be installed under a sink, could be a better choice for some people.
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79 Comments 375 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: Blue
We purchased this product to try to be more "green" about our water usage. While the product should be able to do what it states, it is going back tomorrow. After installing it, we were getting hot water in the cold water line (despite running the valve test they recommend in the manual). After waiting on hold for awhile, I reached someone who explained that if we had single handled faucets from any of a few manufactures the system would not work. They explained that these faucets would let water flow from the hot to the cold side when the pressure was raised on the hot water supply (which is how this system works). The only fix is to replace a part in the faucet (if available) or replace the faucet. Since this affects six faucets in our house that are too old to get new parts, we are done. I have no problem with this restriction, but it is not listed ANYWHERE, including their web site and instructions. Given that I now have a piece missing from my hot water supply line, it is a little late to tell me now. I give the product an `A' for what it will do, but I give the company an `F' for their documentation and lack of disclosure of a major problem. This is too major (and common) and issue to not tell people about up-front. I feel mislead by Watts.
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Color: Blue
I installed the Watts recirculating pump November '07, along with under sink mix valve kit in the kitchen. I bought an extra valve kit for the master bathroom sink. The pump timer was set for the busiest times of day. There was a nearly immediate improvement in hot water at both faucets, which was glorious! The cold water side runs warmer, but so what? But the story gets more interesting:

Being an engineer I was always a bit curious why the pump was necessary, since a law of thermodynamics states that heat always flows toward cold. Theoretically, the mix valves under the sinks ought to function without the pump. Well, one day I unplugged the timer to see what would happen. You know what? The faucets produced hot water just as fast without the pump running! Now we leave the pump off all the time. My advice is to save yourselves money and just purchase the undersink valve kits (about $50 each). The pump can always be added later if you find it's still necessary. Maybe some water systems require the pump. Hope this helps!
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