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Old 01-15-2012, 08:56 PM   #1
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High pressure operating


I have a Weil McLain HE II boiler and a W/Mc Gold Plus water tank that has been operating at the edge of high pressure for a while now. I was able to get a warranty replacement of the hot water tank due to the theory that the heat exchanger in the tank had pin holes in them that transferred the high pressure of the domestic hot water into the boiler. That change stopped the high pressure valve relief discharges for a while but now they have started again. I have watched the temp and pressure valve through many heating cycles and the pressure always approaches 30 lbs right about the time the water temp reaches 180 degrees. The boiler shuts off, but many times the prv has to relieve the pressure. I keep a 5 gallon pail that has to be emptied often. I have had to change the prv several times due to its failing to seal properly from either dirt or corrosion. Do you guys think I have another bad water tank or is their some other reason for this high operating pressure? Is their some adjustments that I can make? Is there a chance that the make-up water valve is faulty?
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Old 01-15-2012, 09:53 PM   #2
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High pressure operating


Does it just do it as it gets hot? Check the expansion tank?

Does the pressure slowly creep up? Could be a bad auto feeder.
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Old 01-15-2012, 10:01 PM   #3
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I replaced the expansion tank just before the water tank was replaced.
The pressure rises as the temp rises approaching 30 pounds just as the temp reaches 180.

Isn't this a high operating pressure? I've read on some of these forums stating that the system should be operating between 12 and 16 pounds.
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Old 01-15-2012, 10:08 PM   #4
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High pressure operating


Yes, it should be about 12 cold and it can rise to about 16 or so hot.

It still sounds like a failed expansion tank. The pressure is rising since it has no place to go.
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Old 01-15-2012, 10:18 PM   #5
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Thanks. Its certainly a cheep and easy fix. I will give it a try tomorrow
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Old 01-15-2012, 10:29 PM   #6
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High pressure operating


Just to clarify, the expansion tank on the boiler.
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Old 01-16-2012, 05:28 AM   #7
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High pressure operating


what was the pressure from the water regulator feeding the cold water into the system should be around 12psi cold so that gives you 18psi for heated expansion...anybody look at your cold water feed into the boiler.... pix of the piping standing back will help...doing the same thing from the change it is happening from outside the boiler.can't be domestic leak what is your house pressure from the street most are 60psi plus why would it stop at relief you would have the cleanest relief valve in the hood
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Old 01-17-2012, 10:58 AM   #8
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[IMG][/IMG]<a href="http://s1061.photobucket.com/albums/t466/Snidely55/?action=view&amp;current=boiler2.jpg" target="_blank"><img src="http://i1061.photobucket.com/albums/t466/Snidely55/boiler2.jpg" border="0" alt="Photobucket"></a>

the auto refill is just above the expansion tank

I replaced the prv last week, the old one was not sealing properly and I was getting almost constant water out.

The issue with the water tank was the internal heating coils developed pin holes that allowed the higher pressure from the hot water tank to migrate through those holes into the boiler increasing the pressure to above 30lbs. When the new tank was installed the leaking stopped for a few months but has now be consistently there since.

I will probably change the expansion tank tonight but still wonder if either the auto refill or the water tank are the problem. We had the domestic supply to the house changed to 1" from a 70 year old galvanized and saw almost 70 lbs of water pressure. I am sure its down from that, but we do have a lot of pressure. any thoughts would be welcomed.
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Old 01-17-2012, 10:58 AM   #9
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Sorry - photo not working for some reason
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Old 01-17-2012, 11:48 AM   #10
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High pressure operating


your pix FIX.... type at the end of them pix should show on your post then submit it as usual if that boiler is gas ever consider a gas HWH or even electric.any chance of neighbors having a HW coil for domestic on their boiler and not having this problem.if the coil was leaking into the boiler the pressure would go to the street pressure of the cold water coming it...did you see the first coil and the pin holes when they pulled it

Last edited by biggles; 01-17-2012 at 11:59 AM.
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Old 01-17-2012, 12:01 PM   #11
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pix fix...type [ / i m g ] at the end
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Old 01-17-2012, 01:50 PM   #12
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It is a gas boiler. http://

Got it this time.
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Old 01-17-2012, 02:04 PM   #13
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High pressure operating


Ayuh,... I've Never seen a pressure tank lain on it's side like that...
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Old 01-17-2012, 02:44 PM   #14
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Plumber thought that the problem last time (before we changed the water tank) was the pressure tank. He put a bigger one in and it would only fit that way.
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