On Mon, 14 Apr 2014 22:07:45 +0100, John Williamson
wrote:

However, it's the electric water heater that's costing £250, a diesel
heater costs over £500 fitted. Installing a calorifier run off either
exhaust heat or engine cooling water costs even more.

In fact the vans already have eberspacher hot air units but as you say
the capital cot of changing to ones that heat water is prohibitive.

AJH