It's a total bargain and the only reason I'm not buying it is I have a 3 month old new one already. making a total of 4 of these they are great machines and work very well indeed.
It will only take less than a hour to change out the heat exchanger coil , for a spare, and you can get a eberspacher / webasto heater form £700 fitted that runs from your diesel tank that protect everything and even stops frost on the windows and give you a nice cosy van in the mornings I know i have on one one of our vans and i works great.