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Article: > The energetic output of an oven stove is 80 to 90 percent, compared to 40 to 50 percent for metal stoves or central heating appliances Energy.gov

Article: > The energetic output of an oven stove is 80 to 90 percent, compared to 40 to 50 percent for metal stoves or central heating appliances Energy.gov > Old furnaces: 56% to 70% > Mid efficiency furnaces: 80% to 83% > High efficiency furnaces: 90% to 98.5% https://www.energy.gov/energysaver/furnaces-and-boilers https://www.energy.gov/energysaver/furnaces-and-boilers EDIT: We can cut the article some slack as ducting (as typically done) does account for losses which are highly variable.

phgn 5y ago
Well, what does "energetic output" mean? If I understand the core point of the article correctly, radiant heat only heats the surface of objects not the air, so it will require less heat for the same effect. I don't how to put a number on this. I think the energy.gov article you mentioned primarily talks about heat leaking outside: > An AFUE of 90% means that 90% of the energy in the fuel becomes heat for the home and the other 10% escapes up the chimney and elsewhere.
stonkdonk 5y ago
this article lost me when I saw those numbers. It also treats heat like some kind of magic and not based on thermodynamics. heat is heat, no matter how quickly or slowly it spreads. A big thermal mass will hold heat, but will also take longer to heat in the first place. You're spending the same number of BTUs in the long run.