I know you will answer “it depends” but I am looking for an order of magnitude. How much electric power does a gas furnace need to light (I have a spark thing) and operate the blower? I am thinking of buying some power back-up to run the heating in time of emergency and was thinking of how much oomph I would need.
Are we talking hundreds or thousands of watts?
And what happens to a gas furnace that is burning when the power is cut? When the blower goes off, does the furnace?