A fuel powered heater is not a bad idea at all but would choose a heater made for gasoline/ petrol.
All petrol heaters, or at least those from Eberspächer, Webasts and Volvo Flygmotor run flawlessly on E85 (85% bioethanol, 15%gasoline) att no matter how low temperatures here in Sweden, so that is an alternative if you prefer an almost fossil free heater.
Other advantages with E85 in a petrol heater compared to diesel burning heaters are that exhaust fumes do not smell so bad and are probably not as unhealthy as diesel fumes and there is much less smoke when the heater is starting up.
A disadvantage of E85 compared to diesel is that it contains less energy so you’d burn a greater volume for the same amount of heat, but as the amount of fuel is so small anyway that is hardly an issue.
In the electric cars with NiCd battery from the 1990’s made by French car manufacturers Citroën, Peugeot and Renault a petrol powered Eberspächer? was OEM fitted and I know the these worked just fine on E85 as well.
see for example wikipedia Citroën_Berlingo_électrique -> heating
Quote:
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"In order to minimise battery usage, a petrol driven heater is fully integrated to vehicle. It typically takes 5 to 10 minutes to warm and provides excellent cabin heating. ”
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