[bjornasm]

It has a max capacity of 8700W, if that is just enough to heat a single room you have to look into insulating house better.

[SketchySeaBeast]

Well, our whole house needs about 70,000 BTU, which is ~20,000 W or 10,000 W (assuming it's still 2x efficient) input at -35 C, but our basement and second floor won't care if the living room is the only area getting heat.