I am guessing cylinder size needed depends entirely on need and frequency/duration of use. I am going to be using a Sievert 86 Pro torch with propane, mainly at weekends and one weeknight. I work full time (and the rest!) so can't do much more than that even on a good week.

As a quick 'litmus' test - roughly how long do you think a 3.9kg, 6kg, or 11kg propane canister would last?

The bigger the cycliner, the cheaper per kg to refill, it seems? I'm leaning towards the 6kg. What do you think?

Julie