Do you mean propane?
Propane campervan heaters
Propane-fuelled systems are similar to diesel systems but, of course need a fuel supply. This could be a disposable canisters or refillable propane tank.
If you’re already using propane tanks in your van, you may be able to tap into your existing propane lines.
Propex is the brand of choice (the other is
Truma, but these seem to be preferred by motorhome and caravan owners). The Propex systems come in a range of sizes for small campervans to big motorhomes. Some models are installed underneath the vehicle, others go in a bed-box or cupboard.
A 13kg propane tank will give you around 90 hours of heat from the smallest Propex furnace.
Propex also do a dual-fuel gas/electric heater for when you’re on hook-up.
Propane systems will often struggle or not work at all above a certain elevation.
Ask your installer if you expect to be camping in the mountains.