sure this is same with folding campers.
Price up s/hand Carver/truma water heater fitted against the extra cost of a unit already with hot water heater must be fitted by gas safe engineer and not that friendly neighbour or builder.
If buying on HP think of a bank loan instead as with the cash and cost of borrowing against HP you could be quids in by having the cash through the bank loan to bargain down the price to one with hot water.
www.caravantourer.co.uk come sound advice. Look find and read on this site so you go armed to the teeth to a dealer. Be careful of private purchase they may still have HP on it, even stolen so get details off the plate whatever or wherever purchased and check firts details on this site.
If you can't find on the site ID plate information type in your search engine box how to tell the date of a folding camper van see what comes up and select ones refering to age and id.
Bob
September 2011