Why not just use a coleman stove two burner. With the hook up I have it will run for about two months off and on of course. Puts out over 11000 btu so plenty of co2 and I already own it.. Guess turning it on and off 5 times a day might be a hassle but I am here all day so maybe right.. Why do butane burners increase humidity? My regular heater drys the fuck out of the room, better than my a/c unit could ever do in dehumid mode. I know it is hot.. But anyway If I could rig a timer device for a coleman stove i would only need to have that monitor then I could dial in how long and how often I would have to light it.. Seems simple.. Wondering if filling the room periodically effect good out come though. I mean does the co2 have to always stay right at 1500 to get the results I saw from co2 enrichment or will you get great results still if you can figure out how long and how often to turn on the gas.. I mean no monitor control just looking at at monitor and then figureing out when and how long.. Anyway Fucking co2 is such a decision and it is the only way to do it like a star.. Look at fiend's grow, his single giant side by side colas with almost no veg time and just good roots then 12/12 is all the proof I need.. I tried plants that small without extra co2 and I got little nothings.. With the big plants i got great colas but lots lots and lots of work trimming and the like so ok... still can't figure out how a propane burner is cooled somehow with water? I mean the flame is open and the gases come out so would the heat so how does the water thing cooled the gases??