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Old 10-30-2017, 05:02 PM   #1
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Question Expansion Tank or Thermal expansion bypass valve

Expansion Tank or Thermal expansion bypass valve?

Customer is replacing (2) 80 gallon electric water heaters and he would rather not use expansion tanks due to previous tank failures, I suggested the bypass valve & pipe discharge to outside. http://www.supplyhouse.com/Watts-037...gaAgg-EALw_wcB
Any pro or cons or suggestions?
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Old 10-31-2017, 10:23 PM   #2
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Their are some cheap ass plumbers in town that have used a ball valve to the water heaters with a built in expansion valve on the stop... you have to run a weep drain down to the floor drain

I assume that they work... I try to never touch them when I change out a heater because they can be fussey... i guess they work but I would rather have the expansoin tanks on the heaters .
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Old 11-01-2017, 07:22 AM   #3
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Thanks Mark!
Maybe that's why I never see any here, I didn't know they were temperamental.
I will just use the tanks on this job and explain to him that they are the best option.
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Old 11-01-2017, 11:41 AM   #4
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The poppet valve is not for Thermal Expansion, and not for Potable Water use !

The valve that Mark posted on I saw a lot of in SLC, UT 10 years ago used
on all new construction but they waste water, Water that you you just paid money to heat is going down the drain
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Old 11-01-2017, 03:09 PM   #5
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It’s pretty rare you see an expansion tank on a heater, I see them once or twice a year at the most. Boilers, all the time. I know what they’re for, but other than that I know very little about them, so it’s always a treat reading about them.
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Old 11-01-2017, 03:14 PM   #6
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Quote:
Originally Posted by OpenSights View Post
Itís pretty rare you see an expansion tank on a heater, I see them once or twice a year at the most. Boilers, all the time. I know what theyíre for, but other than that I know very little about them, so itís always a treat reading about them.
I have taken pressure readings on a hose bibb and have seen pressure spike 10+psi if the water heater is on and there is no expansion tank.
What gets me is when guys install them with just precharge air or install them horizontally with no bracing or support. You're just asking for a problem

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Old 11-01-2017, 04:19 PM   #7
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I haven’t had to deal with high water pressure since I moved to Michigan, here our battle is with low pressure do to old galvanized or water quality and built up sediment. Smaller communities like mine use water towers, once on each side of the bridge. Not really sure how Lansing regulates their pressure, but I’ve never felt anything thing alarming. Mater of fact, I haven’t seen my gauge in 14 years...
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Old 11-01-2017, 04:21 PM   #8
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We always support them around here....... Lean them on the hot pipe and they are good to go!
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Old 11-01-2017, 04:24 PM   #9
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Quote:
Originally Posted by Plumbergeek View Post
We always support them around here....... Lean them on the hot pipe and they are good to go!
Dammmm sun!

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Old 11-01-2017, 04:32 PM   #10
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Quote:
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Dammmm sun!

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I have lots more.
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