Thats cool, I need the motivation to finish this project or it will become a pile of scrap in the closet like all the others.

Fun fact, 1 gallon of liquid propane makes 27,000 cubic feet of vapor, of which a catalitic heater can turn 5.25% into CO2. So that is 1,417.5 cubic feet of CO2 potential production per gallon of propane.

Compaired:

1 ~ $13 Bottle CO2 (20lb) = 180 cuft CO2
1 ~ $15 Bottle Propane (5 gal) = 7087 cuft CO2