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Grundfos 595926 Replacement Comfort Valve for UP Circulator Pumps

4.1 out of 5 stars 155 customer reviews
| 31 answered questions

Price: $54.20 & FREE Shipping. Details
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  • Installed under the sink at the fixture furthest from the water heater.
  • Items comes with plastic material.
  • Threaded at 1-1/2 inches
  • Use with UP comfort series pumps
  • Prevents cold water runoff
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Frequently Bought Together

  • Grundfos 595926 Replacement Comfort Valve for UP Circulator Pumps
  • +
  • Grundfos 595916 1/25 Horsepower Comfort Series Recirculator Pump
  • +
  • Grundfos 519601 3/4-Inch GF 15/26 Cast Iron Flange Set
Total price: $303.07
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Product Description

Product Description

595926 Features: -comfort.-Material: plastic part.-Installed under the sink at the fixture furthest from the water heater.-1'' -0.5'' Threaded.-Use with UP comfort series pumps.-Prevents cold water runoff. Specifications: -For UP15-10SU7P/TLC comfort series 1/25 HP recirculator. Dimensions: -Dimensions: 1'' H x 2'' W x 6'' D.

From the Manufacturer

Replacement Comfort Valve for Grundfos UP15-10SU7P/TLC Comfort Series 1/25 HP Recirculator. The Comfort Valve is installed under the sink at the fixture furthest from the water heater. Eliminates cold water runoff at the faucet.

Product Information

Technical Details

Part Number 595926
Item Weight 4 ounces
Product Dimensions 6 x 2 x 1 inches
Item model number 595926
Item Package Quantity 1

Technical Specification

Warranty [pdf ]

Additional Information

ASIN B00128BIUU
Customer Reviews
4.1 out of 5 stars 155 customer reviews

4.1 out of 5 stars
Best Sellers Rank #30,188 in Home Improvements (See top 100)
#23 in Home Improvement > Rough Plumbing > Valves
Shipping Weight 2.4 ounces (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 5, 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

Verified Purchase
The directions are pretty straight forward. Just install this valve under a sink that is furthest from your water heater. The most important part of the directions is where it tells you NOT to use dope tape or anything else on the valve threads. So I didn't. I hooked everything up and it leaked like a sieve. So of course I went and got my Teflon tape to use on the threads. I just figured the directions were wrong, but I was hesitant because the valve is not metal. So I started wrenching it on and I heard a "crack". I backed it out and there was a small crack at the top of one of the openings. I suspected the material would not hold up to the pressure and it did not. So I looked at everything I had going on and determined that I needed additional rubber washers that go inside of the nuts on the supply lines. THOSE ARE CRITICAL. With the rubber washers in place you can attach your supply lines without damaging the plastic valve and end up with a good seal. So there you go. This thing works great once it's in place and installed correctly. Just don't try to outsmart the directions like I did. Cheers!
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Verified Purchase
Considering that my furthest sink is on the 2nd floor and the water heater is in the basement - decided to follow up on another reviewer's note that heat rises, and a pump may not be needed. Installing the valve was straightforward, and it works well. Now have warm water at the "furthest sink" in about 10 seconds, while in the past it took a couple of minutes. No need for the pump!

Cold water is tepid at start, but quickly becomes cold.

4 stars because the valve is plastic - if it were metal, would be 5.
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Verified Purchase
I purchased this to replace a 5-year old Watts valve that was simply letting hot water pass through to the cold side. The two parts are identical so the swap out was easy. These systems work reasonably well, but simply don't compare to a true closed loop recirculation system. But as a retrofit, you can't find a better value. Just understand the limitations and that your cold water side will always have a bit of warm mixed in when you first turn on the tap. Once this 'warm' cold water side stays warm for a long time - its your indication that its time to change the valve again. Count on every 2-5 years or so depending on use.
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Verified Purchase
I ordered two of these from Amazon (Amazon being the merchant) and both of them were defective. They both function the same as the defective one I replaced. They are constantly open, meaning hot water runs right through it, flushing the cold water back to the water heater. That means no cold water in the house!
I've used these for probably the last eight years. I'm on my second pump at this time. For people who do not understand the function of this valve, it is simple. When water on the hot side of the valve cools, a bimetal valve in the product opens up and lets the pump (at the water heater) pump the cooled hot water over to the cold side and back into the water heater. When the hot water at the valve hits somewhere around 100 degrees, the valve closes until the hot water cools again.
I replace mine about every two years. I consider it a tradeoff: $25/year for instant hot water throughout the house. I just don't like the current state of Grundfos quality control. Going to try the Watts version of this this time. Same product, but it should be a different batch.
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I bought a Laing AutoCirc recirculating pump for our vacation townhome which is on one level and has the valve built in. It works great.
However knowing a little physics I reasoned that at our house where the water heater is in the basement and the bathroom on the second floor it takes a minute to get hot. I figured hot water rises and I might not need a pump. I was right. It works perfectly with natural circulation.
I purchased one of these and installed it and all the hot water above the water heater comes hot within seconds.
Try this first, you can always add the pump if it doesn't work without one.
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Verified Purchase
My hot water circulating system was not working, there was no hot water in the bathroom when the timer was set to send it there. I could see two potential causes, the pump wasn't circulating or the valve was stuck. There was a vibration in the hose out side the pump indicating that the motor was working. The test for for the valve is removing it from the system, then blowing into the hot water input side while holding a finger over the hot water out. If the air doesn't flow, the valve is plugged. If air comes out the cold water side, the valve is good.
Perfect replacement for existing valve. My old one lasted 7 years, several reviews state a much shorter life expectancy.Just takes a few minutes to change.
Why not 5 stars? The Amazon price was the best around, but it is an lot for this valve. Make sure it is not working before replacing it.
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Verified Purchase
I have had these in my house for years and loved them. Remodeled bathroom and started having problem with too much hot water in the cold water lines. Narrowed it down to this device. I recently removed and blew it out with an air compressor. Figure problem may have been caused by some kind of debris in the water line. Waiting to see if that fixed the problem. If it doesn't fix the problem, I'll buy another one because I love them when they work properly.
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