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Expansion Tank location...could it be too close to the exhaust ducting?

Expansion Tank location...could it be too close to the exhaust ducting?


Old 02-10-18, 11:54 PM
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Join Date: Aug 2013
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Expansion Tank location...could it be too close to the exhaust ducting?


My 50 gallon tank died today. Was replacing it and noticed the previous expansion tank was of insufficient size for a 50 and the PSI I have running (50 psi). So I bought a 5 gallon that is more adequate for the measurements.

My concern is my new expansion tank runs about 1/4 an inch from the exhaust duct a few feet from the tank. Also, the hot side shark bite hose nearly touches the exhaust vent. See photos.

My two questions are:

1) Would the proximity of the hot side hose to exhaust vent be a code violation and/or danger?
2) Would the proximity of the expansion tank to the exhaust vent be either a code and/or a danger as well?

Note that after my heater ran for 1 hour on its initial startup, I checked the expansion tank several times near the exhaust ducting and I didn't notice a difference in temperature, thus I'm guessing its just fine.


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Old 02-11-18, 01:04 AM
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,495
Received 35 Votes on 27 Posts
In my opinion that IS a code violation because it is a single wall vent. Code calls for a four inch separation from any flammable surface for single wall vent. Now it is possible that neither the hose nor the tank could be considered as a "flammable surface" but I personally think it would be better if there was a larger air space.

Remember, my opinion is as valuable as last week's newspaper. Others may have different opinions.
Old 02-11-18, 06:02 AM
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Join Date: Sep 2016
Location: USA MI
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My first concern is the tank size itself, I have had, and built many homes with wells and never had a tank that small with the exception of my current system but it is a variable pump system for my GEO thermal. If you had a 50gal tank how did you figure resizing to a 5 gal was correct?

And to put it mildly the installation just doesn't look right, tank hanging from the ceiling, fittings touching vents, vents running along equipment.

It may/may not be code but it looks questionable!
Old 03-02-18, 08:56 PM
Join Date: Feb 2017
Location: U.S.A.
Posts: 60
Received 1 Vote on 1 Post
T&P Valve Relocation -- Dangerous

Moving the T&P valve out of the tank reduces its ability to protect the tank, house, etc. I can't imagine and inspector approving this.
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