Cheers Arry.
From what I can see , it should be fine ( and burn a little bit hotter) , but it would be inside a caravan, so I need to be sure before I do it.
Some people say that the jets in the heater need to be changed , and other folks say that they should be fine.
Other folks say that the pressure would be too high from propane , but others say that that's what the regulator takes care of.
I've found a propane/butane heater , but it comes with a butane regulator, and I can't get an answer from the manufacturer, to tell me that it's safe to change the regulator .