If it works here...

Like most, I have a gas boiler (yes, I'll be nice, Mr. Putin). And outside is its vent.

Now, just I have never been able to figure out why all those pictures of oil rings and refineries had the stuff burning off without being used, I have often wondered why what seems (all due efficiencies inside) a lot of heat going out cannot be reused back in.

Now, one plan I had was to deflect it to waft over the car windscreen so in winter it is ice free.

Trouble is there a lot of vapour and well, it's also poisonous.

However, speaking of cars and exhausts, this looks interesting:

GM recycles exhaust into power

'Aving a bath Mother? Old up, I'll do a quick couple of blogs while you're running it'.