We have both an a/c and a diesel heater in our Quantum. Even when we have 240V available, we choose the diesel heater every time, its so much quieter than the a/c.
If I didn't have the diesel, I would use a 240V fan heater in preference to our a/c, its just too noisy at night for my liking.
If you are considering a diesel heater, it would pay to do some research on the different types. I originally wanted the one that incorporated the HWS as well, but found out that its relatively power hungry and not as efficient.
Apparently the combi heater/HWS types use just under 3 amps per hour, it means you need ~30 amps for 10 hr operation. It also uses much more diesel unless you are using the HWS as well (who does that all night?). By comparison, the heater only units need less than 1 amp per hour, a very noticeable difference.
If Rumpig uses 3 litres of diesel in a night (as mentioned in the previous post), thats more than I used in 8 (yep, eight) nights - and thats running for some 10 hours a night too. I was suprised at just how economical the diesel (only) heaters are, very good on juice.
I am not trying to knock the diesel combi heater/HWS systems, its just that I too had my heart set on one till I found out the drawbacks of a combi uniit.
Cheers
Captain