Sorry guys,
I'm having Internet problems since Virgin Media has rebooted system. Explorer isn't working this afternoon or evening.
Diesel was always credited as being a safer medium than gas.
For me, I started messing around with a diesel heater about 6 years ago, which was probably when gas was in its infancy with the L5 heater.
I didn't like the idea of the gas heater venting into the van, or having to leave the back doors open to vent it. When the tankless heaters from China started to gain popularity, I didn't fancy cutting a hole in the van's roof for the vent, mainly because sod's law would then kick in and I would find another more convenient place in the van.
A diesel heater requires 2 small holes in the van's floor, 1 for the inlet and the other for the exhaust - much better than a 5" hole cut in the roof.
I was also worried about the gas bottle issue, but always thought the if I ever went the gas route, I would fit and LPG tank and LPG filler.
As I mentioned, my recent experience is that an expensive 9kw diesel heater (Webasto 90s only) which costs over a grand new is still a long way short of the Chinese imports of 16kw for £129.99 (was £79.99).
From a costing point of view, you can get a gas heater in your van for around £500 including roof vent, piping etc depending on how far your go.
A diesel heater costs around 6 times that.
Maintenance is also quite costly on a diesel heater. A service will set you back about £500 if they have to replace the ignitor. You can buy a couple of spare gas heaters for that price.