Hello folks my name is Drew. This is my first post but I’ve been reading here a lot lately. I am new to wood heat but not construction. I just built a big house/shop combo to live in and its very well insulated with two furnaces and now a big Royall 6250 non gasser inside boiler. It’s about 250,000 btus. It will be heating a 5600 sq ft insulated slab and about 4000 square ft above it with radiators. I am going to use it to provide the bulk of the heating needs (hopefully) My question is on the operation of this unit. I don’t have heat storage other than the slab. I was wondering what the expected MAX efficiency of this unit could reach if I only burn it fast and hot until the fire was pretty much out. I don’t want to have much creosote or waste the fuel so I wasn’t going to let it idle at all. I’m going to pretty much run it like a Gasser in that respect. Does anybody think it will reach 70%+ (on dry wood) if it’s run hard until it runs out of fuel? Currently my plan is to just load it with the approximate amount of wood that I want to burn and start the unit and let the heat get pumped out all into the slab. No thermostat at all. Just my eye for the wood load and 300,000 lbs of concrete. My propane furnaces will pick up the difference (or the windows) if I’m getting out of the comfort zone temp wise. I also have the concrete zoned to adjust the heat distribution as needed. Does anybody run one this way to eliminate the idling? These units will REALLY smoke if choked out and also waste a lot of wood. Many thanks in advance!