alt Hacker News> My furnace produces 0.9W of heat for every 1W of energy input.
I assume you mean that 10% of the energy immediately escapes your house?
> My furnace produces 0.9W of heat for every 1W of energy input.
I assume you mean that 10% of the energy immediately escapes your house?
Yes, last 10% goes up the chimney, so only 0.9W goes into the house.