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Old 12-08-2012, 10:23 AM   #1
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Air temperature affecting expansion tank air psi


I've got an expansion tank in my attic near the hot water heater and the air psi in the expansion tank can vary 5 or 6 psi depending on the air temperature in the attic. I live in Texas where it gets very hot, and freezes from time to time. I added air when the temperature was about 70* or so thinking that is a good median temp. Any other tips or ideas? Is that much of a difference a big deal? Should I wrap insulation around the tank? Thanks in advance.

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Old 12-08-2012, 10:39 AM   #2
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Air temperature affecting expansion tank air psi


shouldn't vary that much unless tank is flooded, i.e., no air in tank.. if not bladder type..shut off water and .drain water to below air tank level...open any fitting to air tank (drain valve?) to allow to fill with air..close valve and refill system this will provide proper cushion..if bladder type..equipped with air fill valve then check pressure with tire gauge without water pressure in system..should be same as normal water pressure..if can not be pressureized then bladder defective..replace tank

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Old 12-08-2012, 11:08 AM   #3
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Air temperature affecting expansion tank air psi


The tank is new and it is working properly, but just like tire pressure the air pressure will vary depending on the outside temperature. The temperature in an attic can vary from 40 to 80* daily this time of year, and up to 130* in the summer

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Old 12-08-2012, 11:42 AM   #4
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Air temperature affecting expansion tank air psi


Leave it alone, its working.
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Old 12-08-2012, 12:07 PM   #5
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Air temperature affecting expansion tank air psi


Are you talking about a water heater expansion tank? You're over concerned. I bet your water pressure varies that much during the day. No way can you keep them calibrated that close.
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Old 12-08-2012, 12:15 PM   #6
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Air temperature affecting expansion tank air psi


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Originally Posted by TheEplumber View Post
Are you talking about a water heater expansion tank? You're over concerned. I bet your water pressure varies that much during the day. No way can you keep them calibrated that close.
Yes, hot water expansion tank. Thanks for the reply. The water pressure is regulated by a reducing valve but it does vary by that much between normal water usage and the pressure will increase some while the hot water heater is heating water. Thanks again.

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