I am going crazy trying to decide which propane boiler is the most efficient and absolute best. I want a condensing high efficient type. Do I go with stainless or aluminum burners and heat exchangers? I am looking for one with potable water heating capablities. Do all of them self adjust to climate conditions? Thank you,bob

Hi bob. Im a huge fan of the Weil Mclain ultra boilers. Look into them if you get a chance.