Yes..i have had it on all the time..wonder if that's why it has run out of gas?
You might find that you have a leak on the gas system
It could take an age to locate and work out expensive, There should be a light blue thumb screw somewhere in the engine bay, this would be about the size of
a 5p coin, thats where the system is "re-gassed" from, hopefully the seals around that screw are perished and thats where the gas has escaped from.
One thing tho, did you have the temp set to 18 degs??? lol