I'm thinking of making another bulk order of these heaters:
"Webasto" 2kW

Technical Specifications:
Heat Power: 2kW
Fuel: Diesel or petrol (specify on order)
Rated Voltage: 12V
Fuel Consumption: 0.12~0.24l per hour
Power Consumption: 14~29W
Working (Environment) Temperature: -40°C~+20°C
Dimensions: 323×120×121 (mm)
Weight: 2.6kg
CE Certified

Full kit including:
Heater unit
Exhaust pipe
Combustion Inlet pipe
Silicone seal with nuts/washers
Fuel tank pick-up pipe (to straighten and cut to suit)
Fuel filter
Fuel pump
Pump retaining bracket
Rubber fuel pipe joining pieces with clamps
Fuel pipe T splitter (if you don't want to use the pickup pipe)
Fuel pipe
Cable ties
Heater control
Main wiring loom
Fuel pump wiring loom
Manual with installation instructions and user guide
Pipe clamps for exhaust/inlet pipes with screws
Plus, I'm including the ducting kit:
Length of ducting pipe
T piece for ducting
Vent outlet for ducting, with grill
Vent outlet without grill (grill is removed from heater and fitted to this when using ducting
Clamps for ducting
These have proved popular, and this will be the third bulk order.
There have been no problems with any of the units fitted so far, apart from one case of water ingress into the remote controller due to it being fitted below a water leak! which was fixed under warranty.
There's nothing better than being able to get dressed/undressed in a warm vehicle when camping out, in my opinion

Some folk with roof tents have fitted them in the vehicle and run a duct up into the tent. A duct could also be run to a ground tent giving you the luxury of warm air while camping.
There have also been a couple fitted to non-campers, as an additional heat source while driving, or even just for sitting in the cab of a working vehicle for eating lunch on a cold, wet day.
I'm hoping the price will be just under £500 if I make another order for at least 10 units.
If anyone is interested please let me know - petrol or Diesel.
A deposit would be required for firm orders, once I have confirmed availability and price.
Cheers,
Robin.