Useful heat from engines

[TW64]

Well, I was wondering if we could use the heat produced in the fuel engines to heat up the steam boiler and reduce the use of materials to be burned.

So I could have a fuel engine that produces power and instead of just getting rid of the heat it produces, I could pipe it to a boiler and produce steam, which I can then use to get even more power or electricity

This is something use IRL in trans-atlantic passenger cruises, a diesel engine to propell the ship and the electricity from the steam turbines for electricity (and other stuff). A 25.000 passenger cruise (and a 1000 crewmembers) requires as much electricity as a city of 150.000 inhabitants

[Unhinged mechanic]

There wouldn't really be any point in FTD, power is super cheap. The space it would take up would be better used for other things. If fuel economy was actually a concern then this might be relevant.

[Eagle]

Fuel economy is a concern in the campaign. But this seems a bit too complex to achieve (code wise).

[Richard Dastardly]

Probably not that hard to do, but balance-wise this seems a bit off