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Posted by on October 21, 2006, 5:57 pm
silenceseeker2003@yahoo.com wrote:
> The story begins when I dicovered that the relief valve (of my home's
> heating system gas-based heater) discharges about 1/4 cup of water
> daily.
>
> A technician from the gas company (called for a different problem) that
> saw this immediately pointed to the Amtrol expansion tank (Extrol model
> #30) as the culprit. He said he could tell just by knocking on the tank
> and listening whether it is a hollow sound or not.
>
> After he went, I tried this myself but I actually noticed that the top
> part (which should be filled with water) does not sound hollow, while
> the bottom part (which should be filled with air only) sounds hollow.
> Isn't this the way it is supposed to be? If so, what made him say this
> is the expansion tank?
>
> Also, while he said that the expansion tank should be replaced, I
> noticed a threaded air valve at the bottom of the tank, which looks
> like exactly the ones found in bicycle tubes. Is it possible that I can
> get away with simply re-filling some air in the tank, instead of going
> into the expense of replacing the tank?
>
> It should be noted that I have no intention of replacing the tank
> myself, but rather let a professional heating plubmer do that. However,
> I feel that I need to gather as much information about the problem as
> possible, before going ahead with ordering a repair. One plumber I
> called said the expansion tank alone will cost me $250 (excluding
> labor!). I found that same exact tank for sale on the Internet $43.55
> ...
>
>
> Thanks!
> Sam
put an auto tire pressure guage on the air valve and check the pressure
is still as specified in the owners manual.
If water comes out of the air valve you need a new tank , or a repair
kit.
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