Dowel
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so without looking through all the replies....
I am at a similar stage as you, want a heater but still weighing up the pros and cons. I have been following this and similar threads including the boaters ones.
The general view on size is small is better than overlarge as running them on a low setting leads to sooty deposits and running problems. My van is a high top but only 5.2m long and insulated so I would be looking for a 2kw heater. From what I have seen a 5kw heater should be ok for you although in addition to size you should consider how well it is insulated etc. There is a rough table of heater sizes at this Webasto page:
Webasto: Heating solutions for motorhomes and caravans
Running on kerosene or paraffin is reported to give cleaner running but you would need a separate tank rather than feeding from the vehicle fuel tank.
If properly installed they are very safe. They have been used in work vans, welfare vans and truck sleeper cabs for years. The combustion intake air and exhaust are discharged externally and are completely separate from the hot air circuit which heats the van. If needed or preferred the heater can be fitted outside of the body, commonly hung underneath.
Safety concerns have been aired elsewhere and one person reported they had obstructed the heating air flow to simulate an accidental blockage and the result was that the heater shut down rather than bursting into flames.
Diesel fuel is safer than LPG, it doesn’t light easily and does not easily form an explosive mixture.
You are more likely to find discussion of good vendors on the facebook page than here.
Hope that encourages you to read through all the posts and form your own opinion as I have to nip back to the dementia ward before they notice I am missing, caveat emptor!