Swedish Army emergency gel cooker/stove

[Geordie_Rob]

Maybe it's best to abandon the whole refilling idea for safety reasons.

Do you know if its safe to use these burners in confined spaces (such as cars in an emergency - obviously on a heatproof surface) or if they need ventilation like other stoves for fumes? I'm just thinking in an emergency, it would put heat into the car aswell as provide hot water/food.