In reality it's not always that easy, once you look underneath the van there is quite often something already under where you want to mount the heater rendering it unusable.

Heater | VEVOR EU VEVORDiesel Heater | VEVOR EU

They give you lots of the plastic fuel line so you will not run out but it is best to keep it as short as possible. Of course they require venting, there is an EXTERNAL exhaust (HAS TO BE OUTSIDE THE AIRSPACE) and a combustion air intake (should be outside the airspace).If you are looking for an all in one type heater for heating something other than a vehicle there are loads of choices on the market with a verity of different controllers and remotes. The answer is usually yes, but make sure to read the manufacturer's directions for compatibility and specific instructions. It can be quite hard to get the exhaust pipe that is supplied with the heater to reach where you want it to especially if your install is anywhere near the centre of your van, the pipe supplied is only 60 cm long so some people need to extend it a little.

Diesel Air Heater All-in-One with Remote HCALORY 12V 5KW Diesel Air Heater All-in-One with Remote

Yeah I just built one of these into a plastic box and built a window insert with a 4×6 piece of wood for the exhaust. First of all they come with a decent LCD controller and remote control that have lots of youtube videos on how to use them. If you have a very small vehicle from a car up to MWB van then a 5kw heater will be far too hot and the best option for you is 100% a 2kw unit. The housing itself is made from black plastic, but the material is heat-resistant and seems very durable.The three button controller isn't the worst option on the market but it is very basic and far from the best option when it comes to functions and ease of use.