Well, that does not sound good, it is an updraft boiler, so only way to reduce smoke is turn down the fan when loading. I would not shut it off just put it to min speed, and open the door slowly.if the fire is idling and not burning you dont want it to backdraft opening the door. Use a respirator when loading the dboiler, af wood smoke contains a list of tiny particulates not healthy in a small space.
I am 77. I have a Uni 15 and large buffer tank being delivered next week; to be installed in the walk-in basement of our NH 1200 sq ft ranch. Not a newbie; heated with wood for many years back in the day. My father heated with wood for many years; as did my grandfather on the farm. Lots of wood here on our 4 acre lot and no immediate neighbors. Good chimney draft as we are sited on a saddle with east/west prevailing breezes. Studied the options and available products. Inside is better/more convenient than outside if you do it right. I like the UNI design and old country pedigree, with modern control system. I am fabricating a 4'x4' hood over the stove with external vent and exhaust fan to operate when loading/servicing the stove. Plate exchanger on the hot water heater. Water/air heat exchanger in the furnace plenum. Oil kicks in if the fire goes out. Next winter's wood is already cut and under cover. Following winter's wood is felled, will be cut and undercover by Labor Day. Stay warm out there!
