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[–] Gumbatron ago 

To me it would probably make more sense to run a coolant/water heat exchanger instead of/in addition to the radiator on a water cooled generator. The heat could then be piped to a hydronic heating system, or used to partially heat hot water.

Harnessing the excess heat from a water heater or gas central heating unit would be a bit more complicated as it is effectively external combustion. You could use some sort of thermoelectric device (Peltier), but that won't produce much power for the cost, or go old school and use an atmospheric steam engine, although that would end up being about as big as your house to get any sizeable amount of power out of it. You might have some luck with a LTD sterling engine, but again, they get quite large when significant power output is required.