Thanks fellas for the replies.
I ask because i have run gas boilers which do get the water hot.
I also have an immersion in my storage tank in the garage(wired up properly on 16amp with rcd)
This keeps me running over the colder frosty months.
I live on the coast with lots of salty windows coated in seagull cak.
i have just gone round with a customer price increase.
But am thinking of raising a bit more in time.
If Dazs calculations are correct this could pay for itself soon rather than being a luxury as i know some say it is.
Tris
this is my findings after 18 months of using a diesel heater tris......
if your getting a brand new one fitted by the likes of grippatank i would install it into a new van(or nearly new)that you plan on keeping for many years....
it was a 25th anniversary present to myself....i also used to use gas heaters.......diesel is so much safer and more reliable!PLUS you dont have to worry about anything freezing in winter as they come with a frost stat feature built in if you get a grippa heater.....
also no more unscrewing the drain screw on cold nights or heater going out on a windy day!,no more changing gas bottles!bliss.....just press a button before you set off for work in the morning and you ve got hot water for your first job of the day......