Funny. I just watched an episode of the NB guys brewing in the middle of winter on a frozen lake while ice fishing. Their propane tank froze so the used a smaller propane bottle attached to a heater to heat the frozen tank It worked.
I have yet to brew in the winter since I've only done 5 batches so far. I'm definitely looking forward to it because I'm in hot @$$ Florida brewing in the garage!
I was like "I want to do that" until I read heated up the propane tank with another propane burner
Does seem like fun though, I will have to combine fishin' and brewin'.
I'll soon be brewing in hot texas heat so we'll be in the same boat. Little chance for combining ice fishing and brewing, that is.
ETA: my first pieces of texas brewing equipment will be, in this order:
1. a freezer/regulator setup for keeping fermentation temps cool enough and
1.a. a secondary wort chiller so I can run the cooling water for my primary wort chiller through an ice bath in order to get the wort to the right temps before pitching (I will build this myself, btw)
2. kegging equipment and a keg fridge
3. a propane burner setup and a bigger brew pot so I can expand beyond 3.5 to 4 gallon batch size and start doing 5+ gallons of all-grain
4. a clever setup using pipes, tubing, angle iron, and a welder to make the badest-ass-est brewing setup evah
You'll be hooked beyond belief soon too