Winter Gas

The bottle may well be the same but the fittings are not. I'm not sure whether a dealer would exchange a butane for a propane, worth a try but I suspect they might be reluctant. Otherwise the regulator needs to be changed, not a huge expense but a vacuum flask is cheaper. Which is what I said.

I changed 2 bottles last year - from Blue to red. No problems at all.
 
I changed 2 bottles last year - from Blue to red. No problems at all.

Depends very much where you are. With a friendly dealer I can't see that it would be a problem. With an unfriendly one not the same. In France, and I think Spain, it is impossible to exchange even between suppliers, never mind butane to propane. Obviously not Calor.
 
In the West of Scotland, I changed from Calor Butane to Calor Propane with no problems. Just a different regulator, and gas supplier quite happy to exchange bottles. Necessary for real winters.
 
Have also swapped blue to red and back at dealers without problems. An alternative to the flask of hot water, for those without foresight such as myself, is to run the engine for 10 mins and collect a bucket of exhaust water.
 
No point rushing into things

I want to know why the same size bottle only holds 3.9kg of propane, but 4.5kg of butane. Is propane lighter?

Liquid propane is less dense ( ie lighter) than liquid butane

Google will find the figures for you if you need them
 
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