Well to start off im currently using a non gasification wood boiler. It works well but im going through alot of wood so im converting over to coal. The model im looking at is rated at 108k for coal. First is i know its a good boiler and plan burning wood only on mild days but most of the time coal. So any opinions would be appreciated. Also sizing, i have no idea what the current boiler is rated. Its tied into a airhandler with a water coil. The heatpump i have is a 4 ton. Im thinking it will be ok. House is a log cabin built in 87 probably heating about 1600sqft. Will this be big enough?