Just been to van expecting to find it the only vehicle in the street not to be covered in ice.
Put 500w mini rad in it last night set on number 1 next to the tank and just 1 ft to left and below pump.
Got to van this morn and all frozen up outside, opened the door and all frozen up inside pipes, pump everything, heater warm but not too warm, perhaps it needs to be on full, but surely this would be expensive in the long run.
500 watts for 10 hrs =5kw for 1 hour=55pence or 5.5 pence per hour on full, hardly gonna break the bank but the leccy board will be rubbing their hands together.
after working out those figures I think I will have on full tonight, still might not be enough for a Trafic sized van though'