coalkirk wrote:Free advice here! Don't do it. Pick a fuel and burn it. The multi-fuel units will burn each of the fuels but not burn them very well. Just sayin'. While is may seem like a great idea to be able to burn wood and coal in one unit, there are reasons why you shouldn't. Vent pipes are installed differently for wood than coal. Different type vent dampers are used. Just do your research so yoou don't end up spending thousands on a unit you wish you hadn't bought.
I agree with coalkirk,but If you do want to go this route and nothing wrong with it ( I have a WOC-55 AHS/multi fuel boiler and love it). Make sure there are seperate draft controls for wood and coal. My boiler has a combustion blower for coal and IMO it has a much quicker recovery time than natural draft.
I seen on the NewMac website there was a blower above the load door.I didn't see any cut away views to see if had seperate air passages for below draft and above draft.
Member DennisH in Michigan "not me" has a Yukon furnace and is very pleased with it and burns both wood and coal with it, I'm sure he will help with any info. you need about the Yukon furnace.