HawthorneVillager.com :: View topic - Mixing Valve

Does anyone have any experience with backflow on the cold side of the mixing/anti-scald valve on their hot water tank?

I noticed today that the pipe on the cold side of the valve was quite hot. When running hot water at a faucet, the cold pipe feeding into the mixing valve cooled down as expected but it quickly started to heat up again after the faucet was turned off.

From what I can read on the Wilkins/Zurn site (model #ZW1017), there may be an issue with a clogged check valve.

Is this something that is DIY fixable? or should I be contacting Reliance to come in and have a look?

Sounds like the same problem as in this thread. Here the cold water dip tube was the problem. After 5 min the hot water side is only drawing cold water since the cold water is not being diverted to the bottom of the tank.
http://www.hawthornevillager.com/phpbb/viewtopic.php?t=15694

If you have plastic lines you can by pass the valve for about $20.
Home Depot rents the crimping tool, you can get couple of fittings and pugs and crimp on rings and in 10min the valve is out of your system.

Pry off the blue cap. (There is a small opening at the bottom edge where you can use a small screwdriver to pry it off. Take an adjustable, or other wrench and turn the tiny brass nit at the very top of the brass valve. Turn it counter clockwise to increase the temperature and clockwise to decrease the temperature. Turn it one to two complete turns and then run the hot water at a tap and see if it is hot enough. You can adjust the temperature in the actual hot water tank by following the instructions printed on the adjustment at the bottom front of the tank.

Author:	mt_42 [ Fri Feb 13, 2009 7:08 pm ]
Post subject:	Mixing Valve - Backflow on Cold Side
Does anyone have any experience with backflow on the cold side of the mixing/anti-scald valve on their hot water tank? I noticed today that the pipe on the cold side of the valve was quite hot. When running hot water at a faucet, the cold pipe feeding into the mixing valve cooled down as expected but it quickly started to heat up again after the faucet was turned off. From what I can read on the Wilkins/Zurn site (model #ZW1017), there may be an issue with a clogged check valve. Is this something that is DIY fixable? or should I be contacting Reliance to come in and have a look?

Author:	HaltonPeelHomeInspection [ Sat Feb 14, 2009 10:04 am ]
Post subject:	Re: Mixing Valve - Backflow on Cold Side
mt_42 wrote: Does anyone have any experience with backflow on the cold side of the mixing/anti-scald valve on their hot water tank? I noticed today that the pipe on the cold side of the valve was quite hot. When running hot water at a faucet, the cold pipe feeding into the mixing valve cooled down as expected but it quickly started to heat up again after the faucet was turned off. From what I can read on the Wilkins/Zurn site (model #ZW1017), there may be an issue with a clogged check valve. Is this something that is DIY fixable? or should I be contacting Reliance to come in and have a look? Hi mt_42 In the first place, I think you will find that the mixing valve belongs to you and not reliance. That's the way most agreements work. They will come out but you will have to pay. This sometimes comes as a shock to people when I inspect older homes. I occasionally find a 15 or 20 year old water heater that is leaking. The home owner finds out that the rental company will replace the tank for free but is obligated to instal a mixing valve at the owners expense (usually about $200). Back to your question. You may not have back flow. Don't forget that the mixing valve body is metal and metal transfers heat very readily. When you turn off the water, heat will quite quickly be transfered from the hot part of the valve to the attached cold water piping, which is nothing to worry about. John Allingham, Professional Engineer Owner & Certified Home Inspector Halton-Peel Home Inspection (416) 254-5869 www.peelhomeinspection.com

Author:	R_and_N [ Mon Feb 23, 2009 4:05 pm ]
Post subject:
we are having a problem where we can't get more that 5 mins of hot water while in the shower. we've had mattamy and reliance over a few times in the past month and have had a few parts changed and no success. reliance was in again this morning and in now suggesting changing the mixing valve. mattamy has agreed to change it but they said it has already been changed once before. i'm at a loss for ideas at this point.

Author:	Tim&Sandra [ Mon Feb 23, 2009 5:36 pm ]
Post subject:
I had thought I would have problems with my hot water tank when I moved in because the tank was laying on its side for some time before they installed, but no problem occured. You can always go tankless and have the anti scald valve removed at the same time. Tim

Author:	Matt [ Tue Feb 24, 2009 7:55 am ]
Post subject:
The mixing valve is 100% useless. I had mine removed and wish I had done it on day 1. Your hot water tank has temperature control and your shower heads have safety features in them as well. Now when I turn on the hot water, I almost immediately get hot water. I had to turn my hot water tank down too because it was so hot. If you turn your tank down be careful not to turn it down toomuch or bacteria can grow in it. I am sure I have saved water consumption by not having to wait for hot water and I have saved on Gas for using more water then necessary after I got rid of it.. Matt

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Author:	R_and_N [ Tue Feb 24, 2009 11:31 am ]
Post subject:
we don't have a full size water heater tank though. we have the so-called energy efficient on-demand water heater with the small r2-d2 size tank. tigerchamp2004 wrote: Sounds like the same problem as in this thread. Here the cold water dip tube was the problem. After 5 min the hot water side is only drawing cold water since the cold water is not being diverted to the bottom of the tank. http://www.hawthornevillager.com/phpbb/viewtopic.php?t=15694

Author:	turboquattro [ Wed Feb 25, 2009 9:16 am ]
Post subject:
If you have plastic lines you can by pass the valve for about $20. Home Depot rents the crimping tool, you can get couple of fittings and pugs and crimp on rings and in 10min the valve is out of your system. I adjusted the water heater low enough so that we can still have hot shower when the tap is in max hot position, the water heater adjuster is in between mid and vacation setting YMMV. I've noticed a huge drop in out gas cost after I adjusted the water heater thermostat. Also, no way anyone can get scalded with water at that setting making the valve useless even if it worked properly Hope this helps.

Author:	Millrye [ Wed Feb 25, 2009 11:16 am ]
Post subject:
turboquattro wrote: If you have plastic lines you can by pass the valve for about $20. Home Depot rents the crimping tool, you can get couple of fittings and pugs and crimp on rings and in 10min the valve is out of your system. Are you saying you did the bypass Turboquattro? Are you able to post picks and a quick 'how-to'?

Author:	HaltonPeelHomeInspection [ Wed Jan 08, 2014 11:33 am ]
Post subject:	Re: Mixing Valve - Backflow on Cold Side
NE1 wrote: Pry off the blue cap. (There is a small opening at the bottom edge where you can use a small screwdriver to pry it off. Take an adjustable, or other wrench and turn the tiny brass nit at the very top of the brass valve. Turn it counter clockwise to increase the temperature and clockwise to decrease the temperature. Turn it one to two complete turns and then run the hot water at a tap and see if it is hot enough. You can adjust the temperature in the actual hot water tank by following the instructions printed on the adjustment at the bottom front of the tank. Catching up on your reading? Good info but that's a 2009 thread. John Allingham Owner & Certified Home Inspector Halton-Peel Home Inspection (416) 254-5869 inspect@peelhomeinspection.com http://www.peelhomeinspection.com

Author:	kathy13 [ Fri Jan 17, 2014 4:44 pm ]
Post subject:	Re: Mixing Valve - Backflow on Cold Side
Mattamy installed our hot water tank incorrectly. Not only did that happen, but the mixing valve was also faulty. We had them come in and fix it for us.

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