What I know about hot water and steam boilers would make your head swim. What you know I could easily fit in a thimble and still have room left over. Have you actually seen an efficient boiler? Just installed a Lochinvar Knight. Awesome and the customer loves it. Went from $800 a month to just barely under $400. Damn, I sure wish I knew what the hell I was doing. Poor ransley......maybe someday you will grow up to be somebody or something other than a little piss-ant. Bubba