I had a Harman PB105 pellet boiler which I loved once I got it dialed in.
I sold the house. In my new house I went with a Pellergy system that hooks up to a Buderus 4 section boiler.
The fundamental difference between a furnace and a boiler is that once that call for heat has ended, there is absolutely no place for the heat to go except into the steel of the unit itself. This is a matter of simple physics being that air is a poor "absorber" of heat. .
What about a wood stove? It is my understanding a wood furnace is basically an EPA stove in a sheetmetal box. Correct me if I'm wrong here, a good part of my family heats with wood furnaces that are quite old, good ducting should have some convection to cool the firebox in the event of power outage.
TS
And how is that new system with the Buderus compared to the Harmon?
Very true Taylor. Just look at all the ancient wood coal gravity furnaces that were used decades ago. Their operators knew how to fire them according to the weather. (Neadertal man outdoor reset?)
Knew that they had to have dry wood put up a couple years in advance. And the duct was sized to allow heating by convective air flow only. THAT is the key difference between a "modern" wood furnace and the old girls out there. There are more than a few in basements around these parts yet to this day. Some of which are crowding 70-80 years old.
A couple other "minor details"........the working surfaces were cast iron, often lined with brick and they weighed about 1500 pounds. Far different beastie than a modern wood/pellet furnace.
About like making a construction comparison between a Ketel-One and a Windhager pellet boiler. There is none.