I live near a hot water tank manufacturer and they scrap dented/unuseable tanks. If I could pick up a couple 80 or 125 gallon hot water tanks would they be ok for my buffer and expansion tanks? House water pressure is by far higher than the 12 to 30 psi that my system will have in it. Got ahold of the scrap yard that takes care of them and was told it should't be a problem getting the tanks.