Thursday, Oct 31, 2013 at 10:05
We have the Eberspacher unit, it is very economical to run, using only about half a litre an hour on high, but it doesn't stay on high for very long. It will raise our 20' van interior temperature by about 5 degrees in half an hour, gets to the set temperature and then goes to a lower fan speed and heat output.
The thermostat has a bit too large a differential, but you learn to work around that.
I only have one outlet vent in the van which is positioned to blow down the length of the van, but I also have another vent, which can be blocked off, installed on the outside of the van which heats the annexe (when required) admirably.
Make sure the exhaust is on the off side of the van and not under a window as the fumes can be a bit annoying.
The fans on both types are a bit noisy when on high speed, but they don't stay there for long.
Pros -
Doesn't use precious gas, which can be a concern if running a 3 way fridge and are a long way from civilization.
You can go into a service station and partly fill a diesel tank, and only pay for what you get, whereas with gas, you pay for a full bottle no matter how much you actually receive.
The diesel in the tank becomes an extra reserve for the vehicle (assuming a diesel tug) if you leave yourself short.
Gas becomes increasingly more expensive than diesel the further away from the cities that you get.
You can legally install it yourself, no gas fitter's licence required.
Cons:-
The diesel is more smelly when in operation than the gas unit. This is more a concern for other campers nearby than for you, but the upside is that it entices them to not be too close. They just sit there shivering and cursing.
You have to carry an extra tank for the diesel, but then you also need more gas for the other unit.
The diesel fuel pump emits a ticking noise which can be a bit annoying to those of us who can still hear such things, so don't position it under the bed if you are going to run the heater at night.
I think I have covered most of it, hope it helps.
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520666