Report "Hi. I have just purchased a Provence flueless gas heater. Was about to go out and get the gas cylinder, when I noticed on the safety instructions it stated a minimum room space of 64 cubic meters! I maybe wrong- but most people’s conservatories surely aren’t that big. Our adds up to 31. We have plenty of ventilation.i.e. 6 large windows and a door- but we’re now a bit worried about using it. When looking at all descriptions on internet etc of the heater, none mentioned a minimum of 64 cubic metres. Can anyone tell me if the heater is safe to use with lots of ventilation?"