you still need to radiate the heat you produce; the device cold side heats up during operation, up to the point where the conversio stop, so you're going to hav

you still need to radiate the heat you produce; the device cold side heats up during operation, up to the point where the conversio stop, so you're going to have to cool it. besides, water in a ice engine need to be cooled down fast, at the rate these device extract temperature from the sources, you're going to have to need a huge surface area being extracted, or two set of radiators - one to control the circuit temperature, the other to cool the generators. these device application are a lot narrower than one might expect.