I'm going against the flow here, WVW, but
I meant to say last time, in the thread about woodstoves, that we used the "Sealey" look-alike ( oblong, red-glowing fire) with red propane cylinders for years
for heating and cooking.
Straightaway I'd better say that it's probably illegal nowadays, but i still do it.
Admittedly, we tend to cook in shelters that are open, but in the old days, when we cooked up at work ( steak for breakfast in those days

) we used this thing flat on the floor of the old wooden hut or cabin with a paving slab under it.
It would be used for cooking the breakfast and would be on most of the time with a big kettle boiling away.
Yes, you get a lot of condensation, but that's what we did for thirty years or more. English blokes just used to have a cuppa and make some toast with the pieces flat on top of the flames.
I bet a lot of folk are gasping with horror, but that's what went on.
I still get the kit out nowadays if weather conditions are so wet I don't feel like lighting a fire.
Your're a bit more sensible than me, but what I'd do is get down the recycling centre and ask for a regulator for the blue butane bottles. Then use up that bit of gas and, after that, never bother with anything but the red bottles ( bigger the better) again.
Please be aware that this probably contravenes every regulation in the book, and please remember that we had the old hut burn down on us one time in Leith Docks, Edinburgh.
Btw, if you get a blaze, cut the rubber tube with a sharp knife and drag/spin/roll the cylinder away. Then you can turn off the valve at you leisure, when you're out of harm's way.
That's why those cylinders are better free standing outside. It's safer.
That said, one cold winter in Northamptonshire, we had two of those big red cylinders inside the trailer - one in each wardrobe!

We used to leave the heater on all night. Not a safe idea, I suppose.
Finally, as an aside, we were in Santa Monica on that third street, or whatever they call it, one evening. As we were dining out by the street, they had those big patio heaters. The cylinders were towering above our heads as we sat at the tables. The smell of gas was terrible but nobody seemed to care a damn.
Though we were roasting hot, one guy called for them to light up yet another one as he reckoned it was a cool evening!
sean rua.