Boiler expansion tank replacement: steel expansion vs bladder?
My 48" x 12" horizontally mounted steel expansion tank has developed a pinhole leak (it's 40 years old but has otherwise served me well) and needs to be replaced as the PRV is opening due to excess pressure build-up each heat cycle. I realize that the standard tank nowadays is the bladder type, but they will never last as long as the old type, so, my question is: Should I replace the old tank with a new bladder type or one like the old one? If so, what would be the equivalent size bladder tank to the 4' x 1' steel expansion tank I now have, and is it crucial where it should be located in relation to the boiler? Thanks for any helpful comments! Greg