Can Stove Heat Be Recycled for Home Efficiency?

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The discussion centers on the inefficiency of heat energy loss during cooking, particularly when using grills and stoves. Participants explore the idea of capturing and utilizing this wasted heat, suggesting that while it may be theoretically possible, the practical implementation would be inefficient and cost-prohibitive. Many contributors note that in colder climates, such as Alaska and Oregon, the waste heat from cooking appliances can actually contribute to home heating, making the use of energy-efficient bulbs less beneficial during certain months. The conversation also touches on the efficiency of heat transfer from electric stoves, with estimates suggesting that a significant portion of the heat produced is effectively transferred to cooking pans. Overall, while the potential for heat recovery exists, the consensus is that the practical benefits may not justify the effort or costs involved.
  • #31
russ_watters said:
Hold on a minute here: I think the discussion started with an outdoor cooking device - a grill. Quite obviously, an indoor, unvented cooking device (gas or electric is irrelevant) sends 100% of it's heat into the house. This represents a substantial amount of heat.

yup, if you can't stand the heat, get out of the kitchen
 
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  • #32
Now, regarding an electric stove's ability to deliver it's heat to the pan, I suspect the efficiency is above 75%, possibly above 90%. As others have said, conduction is 100% to the pan and represents the vast majority of the heat of the stove. Radiation, due to the reflector plate, is a high fraction (my guess: 75%+). Convection would be considerably lower, certainly below 50%.
 
  • #33
Eh I'm not too good with words. I did mean a stove - indoor stove. Sorry for the misunderstanding.
 
  • #34
From sears.com, a typical electric range has standard burners of 2500 W (8,500 BTU), gas 9000 BTU. That surprises me - I would think that a gas burner would lose much more due to convection.
 
  • #35
OAQfirst said:
Eh I'm not too good with words. I did mean a stove - indoor stove. Sorry for the misunderstanding.
In that case, the answer's easy: you're already recovering all the heat from cooking and using it to heat your house.
 

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