I was going to mention this earlier today, but apparently I didn't hit submit. I just have one question:
Why is there not something for these heating systems that makes them near-perpetual assuming they have enough fuel? Can there not be enough heat to power a steam turbine to generate enough electricity to power the system itself?
It could be done, but normally is not on account of the extra cost and complexity.
Most domestic sized heating systems use either hot water, at less than boiling point, or hot air at similar temperatures.
No steam is produced, therefore cant run a steam turbine (which is a relatively costly device)
Electricity could be produced from peltier chips, heated by the system, but the costs are signifcant. A battery would still be required for starting from cold, and for re-starting without line power after any stoppage.
I would suggest either a generator, or a heat source that needs no electricity such as a wood/coal stove.
I have seen a coal burning heating system that used peltier generators to produce about 60 watts, for a circulating pump and a couple of small lamps, it worked fine but would be too costly for general use.
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