Heat as a byproduct... oh dear...
Hmm... as any reader of Larry Niven's Ringworld books will know...
Heat as a byproduct of mass, localised energy production could cause its own problems. If my neighbours and I generate lots of our own electricity and heat up our neighbourhood, we will need to run our air conditioning units to keep temperatures inside cool enough for comfort. Which uses more electricity and doesn't actually get rid of the heat, it just moves it from inside the house to outside the house, increasing the temperature differential between the inside and the outside. The bigger the temperature differential, the more energy required to maintain that differential...
So... exactly how much heat energy, per KWh, does this unit generate? We could replace global warming via the greenhouse effect with global warming via just plain heat production.
Of course, production of heat in itself is useful, so perhaps a combination electricity generator and heat exchanger so that we can use that waste heat to warm our hot water tank, supply part of the heating for the house etc...