What about heat pumps they have efficiency in the range of 200-300%
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Power-line losses before your house, so a electric heater is only 96%-85% effecient. When the heating for bird feets is accounted, it's 100%.
Blaming the heater for losses in the power lines doesn't seem fair.
what if you're running it directly from a generator?
If the generator is inside the house, 100%. But then you could just burn the fuel...
you could just burn the fuel...

You're assuming this heater is on grid power. We just need to power it by solar panels that are inside the house, under a skylight. Now we've got a 100% efficient heater, just don't ask about PV efficiency...
What about electro-magnetic losses?
induction losses:
The entropy machine has a 100% efficiency
Isn't some energy still dissipated as light instead of heat?
Which travels to a location, hits it and is eventually converted to heat.
So not a heater...but the universe.
Typically a heater is in a room, so any light doesn't need to go further than the nearby walls
But a heater produces heat and light. The light might turn into heat later but that's not heat from the heater. Otherwise everything is s heater and it's all part of the same heater... the universe.
When light is absorbed by surface, the material temperature increases and remits light at a longer wave, ussually in the IR spectrum. So its safe to say all light is heat enegry.
Noise would be a small but non-zero form of heat loss that shouldn't contribute to temperature increase
Noise would turn in to heat as it’s absorbed, so it’s just heat with extra steps. Same deal with lights
Also a question of optimizing its use

noo get the oily greasy food away from technology 😭
The resulting grease fire will increase the electrical power->heat conversion calculation to over 100%!
A completely valid pannini press, imo.
Like this is literally the 'modern problems require modern solutions' meme.
I've used older PC battlestations of mine as 'bonus' spaceheaters more than once, lol