Douglas Alpenstock wrote:Agree, handled correctly there would be no waste heat at all.
A boiler is always more efficient, though it may tie you to a pump. I've heard something about thermosiphon setups but don't know much.
An outdoor boiler is something that insurance people understand. These are often tied in to in-floor heating. Or a radiator coil is added to the forced air furnace.
A fully pressurized system will freak them out, though, and they'll ask "where's the engineer's stamp?"