1: You get about a 4/5ths gallon of water for every gallon of propane burned (0.81 to be exact).
2: Large tank.
3: The environmental controller of choice now-a-days is AUTOPILOT..... I prefer the environ controller with an added Co2 Monitor/controller to control Temps/RH/PPM. Be sure to get a water cooled one and have a cooling tank that the water cycles though.
www.4hydroponics.com/grow-room/co2
4&5: I doubt your space is all bloom? You only need to gas in bloom. The return in veg to cost = NOT worth it. Anyway, I bet a 4 burner would do fine.
Please note that over 1200ppm is not worth attempting to do......Any increase in plant response to 1500 is far to hard to maintain by any grower to even try. The light intensity needed is almost impossible to do. The temps and RH are hard to maintain, so all this makes it not cost effective or for the
vast majority of growers - impossible. 800 is easy and effective, while 1300 is the basic ceiling for supplementing Co2 in growing. You can go up to 1500 but, your not even going to be able to deliver the needed Umals in light intensity to actually allow the plant to use that high a ppm.....
ANYTHING over 1500 ppm is useless - PERIOD....
Pounds of CO2 emitted per million British thermal units (Btu) of propane - 139.0 OR 3.0 Kg of Co2 per Kg of propane burned
Time for you to do your own math - I gave you the key - You have to find burn rates for specific burners.
Something to consider: The use of propane to increase Co2 rates has a problem built in. It produces ethylene gas as a side effect of the combustion process. Ethylene gas causes plants to ripen faster. Not good for what we want to do. this was always a problem in greenhouse work... it's why a "sealed" room and generating Co2 by propane, is not the best idea. You'll need to use that enviro controller to run exhaust and cooling for that "reset" of the room's temps/RH to relieve the build up of ethylene too.
6: It won't hurt. I used to run an exhaust cycle right after lights out. I wanted that big temp swing for natural coloring and i wanted the excess RH out for night.
7: You got it right! Hang it...
Need to ask a question - fire away!
Good final season for Capaldi,,,eh? I really like Bill! Wish she would stay on ... Wild rumor mill on the next Doc eh? Female/gay/non-white - Just give me someone I can believe in.....