Hey bobv..
Basically it is exactly what it sounds like...
A C02 Bottle heater to keep the C02 warm..
The warmer the C02, I guess either the longer it lasts or the more pressure it will produce...
Interesting concept though...
An electric blanket for your Bulk C02 bottles...
Now how to build one that is portable??
The first thing that comes to mind are those glove boot heaters, open, shake and wrap them around the bottle with a little sweater...
I'm gonna get my gramdma to knit a C02 bottle sweater..
Another thing that may work are MRE heaters..
Not exactly sure how they work,, other than adding water,, but the will get an MRE piping hot in a few minutes!!
ttyle
Eric...