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Old 08-08-2019, 12:17 PM   #1
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why not use a hydronic expansion tank for potable water


The small expansion tank for our well leaks on the outside and the air side had rusty water, it was 9 years old. It says on it for hydronic heat systems. It says in small print, not for domestic water systems

I happen to have a new one, also for a hydronic heat system, says on it, not for potable water.

Why not use a hydronic expansion tank for potable water?
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Old 08-08-2019, 12:36 PM   #2
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Re: why not use a hydronic expansion tank for potable water


It may have all the right stuff but it would add to their cost to have it certified for food use and would not likely add to sales.
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Old 08-08-2019, 01:33 PM   #3
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Re: why not use a hydronic expansion tank for potable water


Hydronic heater tanks often have no lining. If one is used, they donít pay extra for a potable water rated liner material. They donít expect people to be drinking from the heating system.

The water system needs a potable water rated tank.
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Old 08-08-2019, 05:28 PM   #4
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Re: why not use a hydronic expansion tank for potable water


Not only is the certification expensive, hydronic tanks can be all steel. A hydronic loop is an oxygen starved environment. Potable water systems are open and oxygen rich. So either the tank needs a liner, or be made out of other materials.

Cheers!
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Old 08-08-2019, 05:28 PM   #5
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Re: why not use a hydronic expansion tank for potable water


Quote:
Originally Posted by bkvanbek View Post
Why not use a hydronic expansion tank for potable water?
Potable water pressure tanks aren't that expensive, why risk your health?

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Old 08-09-2019, 05:23 PM   #6
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Re: why not use a hydronic expansion tank for potable water


Cancer isn't fun.
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Old 08-09-2019, 08:54 PM   #7
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Re: why not use a hydronic expansion tank for potable water


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Originally Posted by Ghostmaker View Post
Cancer isn't fun.
Like from steel pipes, steel well casing and such?
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Old 08-09-2019, 10:08 PM   #8
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Re: why not use a hydronic expansion tank for potable water


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Originally Posted by bkvanbek View Post
Like from steel pipes, steel well casing and such?
It wouldn't be untreated, raw iron, otherwise It wouldn't last very long.

Besides, everything is recognized as a cause of cancer in California. I don't live there, so I'm safe?

Cheers!
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Old 08-10-2019, 08:49 AM   #9
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Re: why not use a hydronic expansion tank for potable water


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Originally Posted by supers05 View Post
It wouldn't be untreated, raw iron, otherwise It wouldn't last very long.

Besides, everything is recognized as a cause of cancer in California. I don't live there, so I'm safe?

Cheers!
Of course well casing would you rather have your water through galvanized? I am in MN so I am safe too.
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