I have a New Yorker residential furnace that is hot water circulated through radiators. I would like to addon a wood/coal combination to this existing system. Here are some specifics: boiler model AP-590 (1993) single zone DOE heat capacity 107,000 BTU fuel oil (now) net output 93,000 BTU The unit also has a domestic hot water jacket. Any help you could provide would be greatly appreciated. I live in Northeast Pa. Thank you.