My portable mini-fridge uses a Peltier device. Give it 12 volts from the car's lighter socket, and it transfers heat from one side to the other.
I have a heat powered fan atop the wood heater. Put a thermal differential across its Peltier device, and it produces a voltage that drives the fan.
An Aladdin lamp at maximum puts out the light of a 60 watt bulb (according to company claims), but also the heat of a 750 watt heater. This seems like a pretty simple device.
Along other lines (not Peltier-Seebeck effect), I grew up with a propane powered Servel refrigerator. I understand Aladdin burners are still used in parts of Africa to power similar refrigerators.
But I'll hang onto my BayGen radio.