Right type of expansion tank?

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Old 03-07-13, 08:00 PM
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Right type of expansion tank?

Hi all,
I am replacing an expansion tank on a hot water heating system.
The existing tank says: ET-30, working pressure 60psi, 1/2" NPT hex

I bought a replacement tank at Home Depot: HTX30, 4.8 gal, 1/2" MPT, Max 100psi (Flax 2, Flexcon Industries).

I just wanted to make sure that the new one was comparable.

I have read the article on this site about changing tanks.

The old one leaked water when I pressed in the air valve. It is causing the pressure relief valve to drip.

Thanks,
Nick
 
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Old 03-07-13, 08:20 PM
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The new expansion tank you bought is probably for a potable water system rather than a heating system. It will work but is not the "correct" tank for the application.
 
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Old 03-07-13, 08:21 PM
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I dont think so... That one I believe is for hydronic heating. You need one for potable water. A potable water model will have a 3/4 MPT end.

It must say potable water on it...

2 Gal. Water Heater Expansion/Safety Tank-G5L at The Home Depot
 
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Old 03-07-13, 08:24 PM
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You bought this in the 30 size..... Not the right one....For non potable use.


Flexcon Industries HTX15FV 2.1-Gallon Hydronic Heating Expansion Tank with Fill Valve - Amazon.com
 
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Old 03-07-13, 08:32 PM
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Sorry for an confusion. This is not for potable water this is a pumped hot water radiator heating system - gas fired boiler.
 
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Old 03-07-13, 08:35 PM
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Oh I'm sorry I misread the post... I could of swore it said hot water heater.... I guess I should find my glasses*******
 
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Old 03-07-13, 08:40 PM
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Thanks. Not to worry.
So the one I have should be OK?

They are both "30" - which is the volume?
Was wondering what the "ET" vs. "HXT" was. Is this important?
 
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Old 03-07-13, 09:24 PM
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Was wondering what the "ET" vs. "HXT" was. Is this important?
Different manufacturers call them different things.

ET 30 is probably a Watts...


 
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Old 03-08-13, 05:44 AM
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Yes, the Flexcon HTX-30 will replace the Watts ET-30
 
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