You guys are so boring!
My father and I put an old oil boiler into the basement of an old house the family owned. We put some planks on the stairs, a rope or chain or strap (?) around the boiler and then a rope or come-along to a 4 x 4 across the door frame of the basement door. As we were easing it down the steps, the 4 x 4 turned on the door frame and the boiler was in the basement in 1.5 seconds (maybe less). The only damage done, was a crack to the cast iron stove pipe collar.
With this experience under my belt, when it was time to put my wood burning boiler add-on into my basement at my marital residence, it should have been a piece of cake. Well, I basically tried the same procedure, but was more careful that the member across the door didn't turn. I don't remember exactly what happened, the steps were shorter, so it only took 1.0 seconds. Since it was a steel stove, the concrete floor was the only damage.
The coal stove into the basement of this house, seemed to go better. ??