Hello all first time poster... In the process of selecting the right wood boiler for my needs. Was really interested in the woodmaster 5500 or in a central boiler classic. However the central boiler forge 3500 really caught my attention. I have access to coal locally at a reasonable price. I also have access to wood at my house. I understand that new EPA regulations stamp coal burners as coal only. When I called central they said you can not burn wood in these units as it will damage or burn out the grates? In my mind coal would be a much hotter fire on the grates than wood. I was planning on purchasing this unit and burning a mixture of wood and coal... Coal is appealing for when I get super busy and don't have time to get wood in, it's also seems like it would be a little more convient for the Mrs. or if we were out of town for my dad or neighbor to fill. Looking to hear any of your guys experiences or thoughts. I will be heating a 2600 square foot house with finished 1500 square foot basement 12 years old with good insulation 2x6 walls blown in in attic but high ceilings and a lot of Anderson windows ( currently have a 115,000 btu propane forced air furnace and heat pump) hot water, 40x60x14 shop, and a pool in future. Wood boiler will be near my shop so it will be a 300 foot run to house and 20 foot to shop. I am also in North East Ohio for climate and weather. I cant justify heating with propane any longer especially with brining the new shop online. I went through roughly 1400 gallons of propane on just the house last year with a 93% efficient furnace.