I had a tank leak on a 20 year old slant fin Gas Fired steam boiler and i was told it would have probably been ok if i drained it and refilled it twice a month. (i did it twice a year during use) What happens to the water inside that it should be drained so often? I decided on a weil mcclean is that a good gas steam boiler for my house? It seems everyone has a different favorite. I don't know who makes good boilers these days. My old one is a slsnt fin. If i posted questions about a boiler before please excuse me but i could not find it if i did.