Having spent too many mornings scraping ice off the inside of the windows, then travelling in a state of hypothermia, plus spending many a night in a semi-frozen comatoze state whilst "enjoying" camping we decided it was time to install some sort of efficient heating in the old boy. 
Finances weren't - still aren't mind you - brilliant, so when I had a chance of a diesel Eberspacher heater at a very good price I took it.

Next thing was to decide where to fit it, the only realistic place was under the rear seat with the outlets facing forwards. This creates its own problems in that the heater has to be mounted to a thick/flat surface, the loading area of a T25 is neither, so we had to have a plate made to bolt the heater to, which was then bolted to the floor.

  The pump was easy, as long as it's fitted at the correct angle and rubber mounted (to prevent too much noise) it can go anywhere within reason, I fitted ours alongside the heater unit as there was space there and it would be below the level of the tank - hopefully preventing having to syphon fuel through if/when we run out, which it has done.

The fuel tank came from a local boat chandlers, it worked out just the right size to fit into a box that we had built into the rear cupboards, and because it was designed to be removed from boats when not in use it can be removed easily from Basset either for storage or refilling.

Fitting the heater  itself was relatively easy in that all it entailed was bolting the unit down to the baseplate previously fitted. Then connecting up the fuel pipe and wires, the latter was only a matter of connecting the two wires from the control switch and the pump, all very straightforward. The air inlet and heater supply pipes were fitted so that they faced forward as can be seen in the pictures.

Next thing to do was to crawl under the van to connect the burner intake and exhaust pipes, again a relatively simple game.

All that was left was to fit and wire the control switch, this I fitted on the box that supports the drivers seat/auxiliary battery box, as this would make it easily accessible from both front seats and the rear section. As it's wired (obviously) to the aux' battery it was a simple matter of running a supply wire, fused of course, to the switch and then the other wires to the pump and heater.

Then connect up, syphon the fuel through for initial start up [diesel fuel tastes awful, I'll tell you that much for nothing] and fire it up. There we have it, nice warm van, either mobile or static, with the advantage that in the winter I can go out in the morning fire the heater up, go back indoors for brekkie, then when we go out the vans nice and warm and defrosted inside and out.

  If anyone should ever want the wiring details just give me a shout, or for the full wiring diagram etc go to the Eberspacher website on the links page.