Chinese diesel heaters are ok, dont be put off with the myriad of folks voicing concerns over problems that are bye and bye created during installation, as in Eibers and Webs are 99 percent professional installs Chinese heaters can be put in by any imbecile that has an
Ebay account (read that as people not qualified to fit them, not everyone who uses ebay is stupid)... M and dont get me wrong, we go to track and see every kind of van setup you can find from my build to thousands of pounds worth of McLaren Motorhomes and the Eibers and Webs are so well integrated, nice controllers and interfaces but for 99 pounds (plus another 25 for the blue controller and red remote at a later date) yea, my cheap Chinese heater is fine.
Anyway, ahv got 2, a 2kw for the van which is more than enough and a 5 (or some say 8) kw for the garage which I have harvested more heat from on account of a longer exhaust that acts as a radiator (not much but it helps). One in the van has been going for must be going on five years now with only one incident remarkably similar to yours whereby I had the heater on at work in the morning but had to move the van to let an artic in the yard, unbeknown to me the diesel can was on the floor and during moving touched the exhaust...
Advice on fitting, research boat installations (yes they are used inside boats safely), will mean the unit itself and the fuel pump which is made of the finest Chinesium money can buy will be out the way of all the crap the UK weather and roads can throw at it (some fabricate boxes under the van to deal with that though. Wiring. these things use a shed load of amps on startup and the wiring that comes with the unit is the cause of most of the problems with voltage drop. Use heavy cable (ah have jump lead thick cable running from the battery which is just behind the bulkhead to the heater at the front of the wheel well and cut the supplied power wire to as short a bit as you can minimizing the weak link. Exhaust paste on the manifold/exhaust (Wurth is good, we use that on the karts) and fiberglass exhaust wrap for where it goes through any part of the van and the exhaust itself will last ah dunno, maybe a week or three, best deal with it when installing and use solid pipe (metal conduit is the right size) n if you cant do it yourself a plumber will cut and thread the parts needed for the price of a couple of pints... (unless e's a money grabbin....) And finally... Place the controller somewhere its easy to get at from bed if you dont have a remote...
The new generation of Chinese heaters are not compatible with any controller other than the new style supplied with it (including afterburner etc unless they'v updated it n ahm no aware of it) as the board inside is completely different apparently, my one in the garage comes under this category, it runs completely different from the one in the van in regards to startup and shut down.
Have fun, n stay warm... Cheers...