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I have a Slant-Line boiler; w/ a heat exchanger to heat the house w/ forced air; and a seperate water tank thru which a coil runs from the boiler to heat the water. I am noticing (especially at night) banging/ not very loud or prolonged but a sound I did not used to hear. So I am wondering if the expansion tank needs replacement. Last year found it sounding the same on the top & bottom to a tap on the side so we took off the tank & found it full of water so we charged up the air valve & now the top sounds different than the bottom to a tap on the side. It is a: Vol 8, Combu tank, with psi 75, & a stamp for Oct. 1990. Does that sound like it needs replacement? It looks like a gallon size; which don't seem to be locally available. Is Combu still in business? they used to be in Woonsocket R.I.? What is the usualy life expectancy of these tanks? Where can I get a gallon size tank & what should I expect to pay for it?
Thank you, Francis