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Old 02-02-2011, 05:01 PM   #1
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What is the proper pre-charge PSI for thermal expansion tanks?


OK, OK. I have read SO MANY conflicting ideas on what the "pre-charge" or air pressure should be set for a thermal expansion tank. Why are there so many different opinions on this - isn't there some standard for this, uggg!!

1) WATTS says to set the thermal expansion tank to the same PSI as your "static" or "base" water pressure (i.e. same as pressure reducing value or PRV).



2) Water heater company (Rheem) suggest 10-15 PSI ABOVE the static or base water pressure.

3) I have read from others that say your bladder can get stuck if pressurized to high, so they suggest 2/3 or even 1/3 PSI of the static or base water heater.

Plumber installed thermal Expansion tank without adjusting pre-charge

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Old 02-02-2011, 05:30 PM   #2
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What is the proper pre-charge PSI for thermal expansion tanks?


Not sure if I can give the right answer, only what mine is charged to..
14psi
I run a single loop system, so I do not know that should be different if there are more than one loop on your system.
Where you taking an old one off and putting a new one in?
Some times a plumber will write on the tank some information, when installed and the pressure are some of the things that some will do, I know that mine did.
That information saved my butt when my system went down at -20 in December.. I was able to get things bad up and running again for now and will finish when spring or summer get here.

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Old 02-02-2011, 07:19 PM   #3
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What is the proper pre-charge PSI for thermal expansion tanks?


If you go to this link, you'll find a short video for adjusting a Watts tank http://www.watts.com/mediaCenter/
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Old 02-02-2011, 07:32 PM   #4
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What is the proper pre-charge PSI for thermal expansion tanks?


Quote:
Originally Posted by Akpsdvan View Post
Not sure if I can give the right answer, only what mine is charged to..
14psi
I run a single loop system, so I do not know that should be different if there are more than one loop on your system.
Where you taking an old one off and putting a new one in?
Some times a plumber will write on the tank some information, when installed and the pressure are some of the things that some will do, I know that mine did.
That information saved my butt when my system went down at -20 in December.. I was able to get things bad up and running again for now and will finish when spring or summer get here.

I believe that you are referring to your boiler and the OP is referring to his potable water system. I always say, when in doubt, do as the manufacturer recommends. I've always set them to the same pressure as the system it serves. If the PRV is set @ 60 psi, then the tank is set @ 60 psi. Make sure you add the air before you install it.
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