Watts Premier Replacement Sensor Valve for 500800 and 500805 Watts Instant Hot Water Recirculating Pump System, 4.5" Sensor Valve, Two 12" Supply Lines with Adapter Fittings, 1/2" Threaded Connectors

The original one of these failed after 6 years, we have very hard water. This is a good brand, identical to the original, thus easily installed and works great.

Perfect replacement for our hot water circulation system. Old valve had failed and this one took 10 minutes to replace.

I was going to replace whole water recirculation pump. However, after I replace this sensor valve, my problem was fixed. It was pretty worth to purchase.

This valve replaced the original valve, which had failed under normal use. I agree with others who say the valve seems to be overpriced, but replacing the valve is a cost-effective option compared to shopping for and purchasing a more dependable system.I bought the Watts system (pump & valve) in January 2017. In November 2019, so after less than three years, the valve stopped working; it stayed closed, and would not open, so whether the pump was running or not, we did not have hot water in a short time as expected. I ordered a replacement valve from Amazon and after it was installed, the system was working again. I wasn't able to figure out how to dismantle the valve as mentioned by another reviewer, and tried CLR briefly but decided to just use vinegar. After I immersed the faulty valve in vinegar (5% acetic acid) for six to eight weeks, I was pleasantly surprised that the original valve had apparently come back to life! Now the valve is open when at room temperature, and is closed after running hot water (105° or so) through it for a few seconds.You can test a valve by plugging the outlet for the hot water tap with your finger and blowing into the "hot" end of the valve. Listen for air to exit the "cold" side of the valve when the valve is cool, no air exiting when the valve has been warmed up. I won't know for sure if this original valve will function until my replacement fails and I reinstall the original valve, but I have reason to be optimistic that I won't have to buy a new valve every two to three years. The valve I purchased from Amazon seems to work exactly as well as the original product. I rate it at four stars to acknowledge that if people have not yet purchased a system, they may want to look for a model that is more robust than the Watts product.

Worked less than 2 months after installation and stopped working completely. Cleaned the original one and placed it back in service. For over $50 I expected this to last longer than 2 months. What a waste of money considering you can buy the whole new setup which includes the temperature valve for $200 and lasts longer than 2 months.

The seals on the various ports decayed and ended up blocking the original unit from functioning. We really did not need to replace the original unit. In reality, we wasted our money. Poor design!

Was a great replacement for the one that quit working. Was a tad difficult to get the threads to match up, but was able to get in installed.

It was ordered and delivered the same day. I ordered it to replace the original that was installed in 2013. You can see in the picture the new sensor valve installed is not a Watts product. I bout this exact product a few years ago to install on a different branch line and it was branded Watts. It was easy to install and works well. However, it bothers me that the listing shows to be a genuine OEM Watts product and is clearly not.

I recently purchased this sensor valve for my hot water recirculating pump, and it works perfectly. The installation is incredibly simple, The valve is high-quality and durable, making it a reliable addition to my hot water system.What impressed me the most was the amazing customer service with quick and helpful responses to my questions.If you're looking for a sensor valve for your hot water recirculating pump, this one is a great choice ,highly recommend

Originally bought the Navien navicirc recirculation valve as I had just installed a Navien water heater the water heater is great but the navicirc valve was horrible it howled like a cat in heat. Left all plumbing the same just installing the watts valve works perfectly very happy with my purchase. Valve on left is watts 1/2 the size of navicirc right

easy to install

I bought this product because I always had to wait for the hot water to reach my upstairs bathroom. After installing this sensor I now have instant hot water at this bathroom . Very happy with the way it works.

I purchased the Comfort Valve to use with a Grundfos pump I purchased to install with my tankless hotwater heater. Now I get hot water quickly!