I have a 10x10 room which i used a CAP GEN-1e with two additional burners(came with 2)which was IIRC ~13 cubic feet of Co2 an hr.(enough to fill the room to 1500ppm in less than 5 min IIRC.
This room is sealed and AC-ed and it worked OK but the heat was excessively high,then i moved from that 800plus cubic foot room to a 220 cubic foot tent thinking it would work out even better since it would only need to burn for one min every 15.
Had to also add a 70qt dehumidifier because i was flowering in the tent at that time and between the burner,dehumidifier and AC(which BTW is electronic and runs 24/7 cycling cold air much of the time to keep temps at 84F.(where it should be with 1500-2000ppm Co2).
I must add only the twin tube AC was on a closed loop,the 400w. was not cooled at all and the power consumption was horrendous.
Now this tent is set up for that 400w. and a 1K(which BTW is water and air cooled)and my plan was to loop the hot side of the AC to both lights and a 4" can-fan as a booster to keep the tent as cool as possible which i will still do soon.
The NG plumed and used for that sized room was almost undetectable on the bill and never needed refilling which was the best part.
Now i cannot say what really was responsible for the heat but surely everything added to it.
My dehumidifier does cycle completely off when not used but late in flower it needs to keep RH so low that it does run almost all the time.
The AC(even though it is a 2 tube design)and the Burner was a close second for heat as far as i could tell with the light adding the least.
Looping the AC and light/lights in and out very well could have made allot of difference.
The need to mount that burner away from things 18" was nearly impossible cause my plan in this 4x8' footprint included a 3x6 hydro tray for my 6 BB system which left me with only a 4x2 footprint left for the AC,dehumidifier,CF-8" can-fan and burner.
My hydro place offered to exchange the burner for a reg and tanks and also said they had that water cooled burner too.
I didn't think twice about that burner at the time but now since i am because i already have 50 gallons of chilled water for my H2o cooled light.
Chunk:I can't get your links to open.
I need to know how far/close it can be mounted to tent sides.
My CAP i found for ~$300 which is everywhere for $450 and the Sentenal is proly VERY close to the same quality and output.
As far as meter/controllers go,you will NEED one which is smart and has the ability to read RH/Temp and Co2 ppm and exhaust accordingly which the CAP and Sentenal both can do.
IMHO the Sentenal has far more options and abilities over the CAP.
I love my CAP and know they make QUALITY stuff no matter what it is and they WILL stand behind everything they make 100%.(i am not easily impressed and they have impressed me more than once).
Meters/monitors can be found used on E-bay (CAP ones can be fixed by CAP or exchanged for a fraction of retail)for $200-$500.
Burners for your size room are $300-$450 new.(not the cooled ones)
Regulators for Co2 can be found for $100 online(even good CAP ones)there are ay least two regs with different outputs so do check.
The aluminum tanks are about $150 new and can be found at welding/beer keg places for $110 new.
Used steel tanks(very heavy) are under $100.
Exchanging/filling tanks are $20-$30 and some will fill "your" nice new clean tank OR exchange it for a pile of crap looking tank,call and ask if this is important to you.
Tanks must be "hydro tested" every 5 years to be filled(DOT requirement)so look for the last stamp date if you want a used tank so you don't get stuck with another hydro bill soon after.
My reg is still in the box and my tanks are yet to come in SO i still can think about that water cooled burner since i have gas into that room,links and any info on it would be great as i was going to see if my tanks were in today.
Would love a cool burner i could put inches away from the canopy and tent sides.