I have 2 expansion tanks on my hot water boiler. One tank is a newer model located above boiler. The second tank is hanging from rafters just above boiler. Is it possible that both tanks are filled with water, causing boiler to over pressurize?
Can having two expansion tanks above a boiler cause it to over pressurize
boiler
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Best Answer
Not sure why there would be two expansion tanks installed, I would look into that further.
To answer your question, yes expansion tanks can become waterlogged. There a two main types of expansion tanks, bladder and diaphragm:
I find that diaphragm tanks are more common now and I would guess that your newer tank is this type. Diaphragm tanks come pre-charged with air (depending on where is is installed this pre-charge may need to be adjusted). Over time, the tank may lose this air charge and need to be re charged.
Here's some information from about.com regarding this issue and how to fix it: