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Internet # 100493462

Model # Sensor Valve Kit

Store SKU # 351512

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Hot Water Recirculating System Sensor Valve Kit

$89.99
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  • Top-grade stainless steel body is resistant to rust and corrosion
  • Lead-free composition ensures non-toxicity and safety
  • Includes two 12 in. supply lines as ancillary items
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Product Details

About This Product

This sensor valve kit is perfect for use with branched hot water lines. No additional pumps are needed. The kit includes a sensor valve and two 12 in. supply lines with fittings. Must be used in conjunction with 500800 Hot Water Recirculating Pump.

Highlights

  • Stainless-steel construction
  • Additional sensor valve for existing branched hot water lines
  • Easy to install with no additional pumps needed
  • Includes a sensor valve and two 12 in. supply lines with fittings
  • Must be used in conjunction with 500800 Hot Water Recirculating Pump
  • Used on branched hot water lines coming from the water heater
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 100493462

Model # Sensor Valve Kit

Store SKU # 351512

Specifications

Dimensions: H 12.9 in, W 1.8 in, D 5.7 in

Dimensions

Product Depth (in.)

5.7 in

Product Height (in.)

12.9 in

Product Width (in.)

1.8 in

Details

Pack Size

1

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

1 year

Questions & Answers

Does it fit on the water heater and also on the farthest faucet?
ByApr 14, 2026
1 Answer | 
Answer This Question

For installation inquiries please call 800-752-5582

By|Apr 15, 2026


    Will a watts valve work on a grundfos pump?
    ByJan 29, 2026
    1 Answer | 
    Answer This Question

    you would have to contact Grundfos about the specific pump that you have. We can only verify that our valve works with our pump.

    By|Jan 30, 2026


      I have a Watts hot water recirculation system with a 24-hour timer for heating H2O. Do I need the Hot Water Recirculating System Sensor Valve Kit in each sink? Only one came with the kit, and I have 3 sinks.
      ByApr 13, 2025
      1 Answer | 
      Answer This Question

      No, you do not need to install a Hot Water Recirculating System Sensor Valve Kit under each sink. Typically, one sensor valve is sufficient for a single plumbing loop. This valve should be installed at the fixture farthest from the water heater to ensure efficient circulation of hot water throughout that loop. However, if your home's plumbing system has multiple branches or loops—meaning separate lines that do not connect—you may need additional sensor valves. Each distinct loop would require its own sensor valve installed at the furthest fixture within that loop to maintain optimal hot water delivery. If you're experiencing delays in hot water delivery at certain sinks, it's advisable to assess your plumbing layout to determine if additional sensor valves are necessary.

      By|May 21, 2025


        I have two valves , one close to the pump and one farther away. When you run hot water from the closest one there is a thumping sound in the other one. this happens even if the pump isn't running. Is this normal?
        ByApr 1, 2025
        1 Answer | 
        Answer This Question

        Please give us a call @ 800-752-5582 to discuss your situation in more detail.

        By|Apr 3, 2025


          Will this sensor unit work on a Watts model#500803?
          ByMar 26, 2025
          1 Answer | 
          Answer This Question

          Yes, it is designed for this purpose!

          By|May 21, 2025


            Can hit water recirculation pumps be repaired? My pump is 3 years old
            ByMar 3, 2025
            1 Answer | 
            Answer This Question

            We do not offer replacement parts or instructions on the processes involved in repairing the pump.

            By|Mar 6, 2025


              Can hit water recirculation pumps be repaired? My pump is 3 years old
              ByMar 3, 2025
              1 Answer | 
              Answer This Question

              Common Issues and Repairs: Pump Not Turning On / Running: Issue: If the pump doesn’t run, it could be due to an electrical fault, a tripped circuit, or a malfunctioning thermostat or timer. Solution: Check power supply and make sure the pump is plugged in and the breaker is not tripped. Inspect the wiring for any loose or corroded connections. You can try resetting the system or replacing the timer or thermostat if necessary. No Hot Water Circulation: Issue: If the pump runs but there's no hot water, it might be due to a clogged line or a malfunctioning check valve. Solution: Clean the system: If there’s a blockage, the line may need to be flushed. Check for proper flow and ensure there are no obstructions. The check valve may need to be cleaned or replaced. Pump Leaks: Issue: If the pump leaks from the casing or seal, it might need a new seal or O-ring. Solution: Inspect for leaks: Check the seals and O-rings for wear. If these are damaged, they may need replacing. Replace parts: Some pumps have repair kits for parts like seals, O-rings, or gaskets. Overheating / Excess Noise: Issue: If the pump is overheating or making excessive noise, it could be a sign of internal damage or mechanical failure. Solution: If cleaning and resetting don't help, the internal motor or components may need to be replaced. Repair or Replace? Small Issues: If it’s just a minor issue like a clogged line, seal replacement, or a thermostat malfunction, you can likely repair the pump yourself or with professional help. Major Issues: If the internal motor or pump housing is damaged, it might be more cost-effective to replace the entire pump, especially after 3 years of use. Where to Get Parts or Repairs: Watts Customer Support: Contact them for guidance on whether a specific part can be repaired or replaced. They can help with identifying replacement parts or recommend an authorized repair center. Authorized Service Centers: Some plumbing services may also offer repair or parts replacement for Watts systems.

              By|Mar 3, 2025


                We installed a Crispaire hot water recirculation pump - after circulation begins and in about 20-30 minutes we begin to get a hammering type noise where the sensor valve is located at furthest point from hot water heater - why??
                ByOct 29, 2024
                1 Answer | 
                Answer This Question

                This product is not the Crispaire, it is Watts branded. Please advise from their product team, thanks!

                By|Oct 30, 2024


                  Viewing 1-8 of 65

                  Customer Reviews

                  4.3 out of 5

                  • 4.3 out of 479 reviews
                  • 89% recommend this product
                  Filter by:
                  Showing 1-10 of 479 reviews
                  This valve was very easy to install under my bathroom sink cabinet which is the furthest from my water heater. With my pump at the water heater set properly, I now get hot water in the bathroom in seconds not minutes.
                  by
                  Purchased this kit because we have a 2-story home. The original comfort valve which came with the pump was installed in the 1st floor master bathroom. This kit was installed on the 2nd floor.
                  by
                  Response from WattsWaterOct 17, 2025
                  Thank you for trusting Watts with all your home improvement needs! Watts
                  • Verified Purchase
                  hot water constantly goes through this bypass
                  I am contractor, a few years ago I did install recirculating pump and two thermostatic bypass valves under two farthest sinks it works well for 2 years, about a year ago the hot water shows in the cold pipe included my toilet thanks, refrigerator, drinking water filter, ect. I had to replace them with new. something keeps that thermostat open and hot water constantly goes through this bypass too cold water pipe and delivers Hot Water to any device connected to it Don't buy it. Arek
                  by
                    1 found this review helpful
                    Watts Hot Water Recirculating System is Great
                    This valve is used as an expansion for the basic Watts Hot Water Recirculating system that includes the pump & 1 Sensor Valve kit. In my house, the hot water supply is teed so that one side supplies the kitchen and the other side supplies the rest of the house. This Sensor Valve was for the kitchen. Regardless, they are easy to install (assuming the sink's shutoff valve still works) and allow instant hot water to the sink and dishwasher. The only drawback to the entire system is that it uses the cold supply line as the return to the hot water tank. That means the first 2 or 3 glasses of water out of the cold side of the faucet are lukewarm and not cold. But, that's not a bog deal. In the bathrooms, it isn't noticeable and rather pleasant 1st thing on a cold morning.
                    by
                    • Verified Purchase
                    • Recommended
                    Works fine
                    It does exactly what it is supposed to do. It even works WITHOUT the pump! I found that when I returned from a long vacation and forgot to plug the pump in I had instant hot water everywhere.
                    by
                    • Verified Purchase
                    • Recommended
                    I purchased this kit to add to my system because it has a second loop, worked great. Easy to inst...
                    I purchased this kit to add to my system because it has a second loop, worked great. Easy to install
                    by
                    Response from WattsWaterOct 17, 2025
                    Thank you for trusting Watts with all your home improvement needs! Watts
                    • Verified Purchase
                    • Recommended
                    I purchased my Watts recirculation system (pump + flex lines + sensor valve) back in April 2015. ...
                    I purchased my Watts recirculation system (pump + flex lines + sensor valve) back in April 2015. Very happy with the performance and water savings. Earlier this month. March 2018, started to get hot water constantly in the cold water faucet side. I suspected the sensor valve had gone bad. Since I have purchased this Sensor Valve Kit, I replaced the valve. And the recirculation system returns to normal performance. So happy with this kit as a spare. I originally wanted to install this kit at another bathroom but did not. I want to buy a couple of sensor valves as spares but not the whole kit (with the flex lines). Unfortunately Home Depot does not carry just the sensor valve. So I have to get it from another company who does. Saves me at least $20 buying just the sensor valve and not the complete kit. Highly recommend Home Depot to carry this sensor valve as an individual item.
                    by
                      3 found this review helpful
                      Greatest investment I've ever made, Hot Water Recirculating System. I can't imagine just how many...
                      Greatest investment I've ever made, Hot Water Recirculating System. I can't imagine just how many gallons of water I've saved using the Grundfos Comfort System (UP15-10SU7P/TLC) plus I turn on the how water and it's THERE!. This Sensor Valve Kit makes it so easy to connect the end of the line sink to the system. I can't say enough about these valves.
                      by
                      • Verified Purchase
                      • Recommended
                      1 found this review helpful
                      This system has been in my home for 6 years. The sensor valve obviously reached its limit. I have...
                      This system has been in my home for 6 years. The sensor valve obviously reached its limit. I have replaced a couple of these for clients. I had circulating hot water almost immediately after installation, at a third of the cost for replacing the entire system (a new pump).
                      by
                      • Verified Purchase
                      • Recommended
                      2 found this review helpful
                      Product works, but...
                      Received a kit that was returned to Home Depot and sold to me. It was missing the rubber washers for the adaptors. Instead of returning, I went to HD and they gave me replacement washers. Otherwise, the kit works.
                      by
                      • DIY
                      • Verified Purchase
                      • Recommended
                      Showing 1-10 of 479 reviews