Welcome to the gang Niffty, enjoy here and out in the playground.
I can't help with info about a Diesel Heater as I have a gas one in my Aluminium TeePee and it works a treat. It has had a lot of use in recent times. I chose Diesel as I have two 9kg gas bottles on the front of the van already and didn't want to add another item and the weight.
I know a few people that have a Diesel and they say like them. I think they are both very similar so gets down to a personal choice thing.
Keep Safe on the roads and out there.
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Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)