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Old 01-09-2017, 11:19 AM   #1
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Thermal Expansion Valve leaking again


Hi,

In 2015 I had my Thermal Expansion Valve replaced as it was leaking cold water into the drain in my basement floor.

It used to have a 60psi rating, so they installed a 90psi rated one due to the high incoming pressure from the main larger valve (maybe the Pressure Reducing Valve?)

Is there a reason this Thermal Expansion Valve would fail just shy of 2 years?

I've heard from some neighbors that they just removed it completely instead of replacing. Good idea or no?


Thanks!

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Old 01-09-2017, 02:49 PM   #2
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Re: Thermal Expansion Valve leaking again


You are located in Canada. Terminology may be a little different. So you are talking about an hvac system or a closed loop system like a water heater.

I agree with you that the excessive high water pressure could be causing the premature failure.

There are several people from Canada that frequent this forum, please wait for one of them to respond. Thank you.

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Old 01-09-2017, 03:08 PM   #3
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Re: Thermal Expansion Valve leaking again


Oh, it's the thing that is right before the water enters the hot water tank. Normally there's a "water expansion tank" but this one just drains directly into the drain on the floor.

Weird, I cannot edit my original post.

Here's what it looks like
Scroll down to Photo 2: A Thermal Expansion Valve

Last edited by steve_e; 01-09-2017 at 03:14 PM.
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Old 01-09-2017, 05:38 PM   #4
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Re: Thermal Expansion Valve leaking again


Install a thermal expansion tank sized for your water heater. Make sure incoming water pressure is below 80LBS
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Old 01-09-2017, 10:03 PM   #5
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Re: Thermal Expansion Valve leaking again


Hard water can cause these to fail faster. Is your water softened before entering the valve?
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