Well N A, The Tankless Water Heater is the Bomb!

I put the T in downstream of the pump, really close to the reservoir that the pump was drawing water from. This way the water coming out of the T just gets spit into the res.

I guess I should add that you could adjust the shut off pressure on the pump. That little screw in the middle of the pump is supposed to do that. You can use this pump to power a garden hose or whatever in the grow room. The pump is "On" all the time but it only turns on and starts running when the back pressure is relieved..eergo.. when you pull the handle on your watering hose.

So I'm researching water cooled CO2 generators and look whose thread I come across. You are one industrious guy. I'll start reading the thread backwards to see what your latest developments are. Fantastic!

Well the short answer is... Any tankless water heater..the smaller the better, a 50 gallon drum or two, some garden house, and that pump that is in the link above.

All and all your in about $300. So much cheaper and easier than tanks. Would never ever use tanks again

After reading this thread months ago I bought a tankless for the hot water in the house. I love it! It uses very little gas and makes some hot water.
Tonight I cleaned it with vinegar and a sump pump to remove scale build up.
Have you ever cleaned yours?

[video=youtube;EDUH8Jr0Dyw]http://www.youtube.com/watch?v=EDUH8Jr0Dyw[/video]

+rep dude. Yeah scale is starting to build up in it I think I will do the flush soon

Thanks again

Thanks for the + and back at ya.
I saw that video before I bought the heater and soldered the valves in place. Worked like a dream.

Nice. Have to love doing things the right way; the first time

So have you flushed yours? Did a bunch of crap come out?

Pretty sweet system though huh? I haven't touched mine in about 6 months. All the co2 I want at the flick of a switch.

I really didnt see scale or anything come out of it. The water was cloudy at first then after a few minutes it was clear. Flushed it for 20 mins.
The water seems to get hotter than it did before so it must be happy.
Wish I would have vented in to my room but more plumbing and the gas line would have made it a pain.

I liked the idea of running a hot tub with your idea.
Pretty sweet!

Yeah. Seems a shame to waste that hot water. I am having a buddy build me a grow "bunker" under the basement of his new house and my co2 burner is going to preheat the water for his radiant floor hearing system

I think you guys need to seal your rooms better. My water never gets above room temperature because the unit doesn't run long enough. I use a 55 gallon barrel and my room is like 22x10. Only comes on for a few minutes, then stays off for hours.

guy incognito said:

I think you guys need to seal your rooms better. My water never gets above room temperature because the unit doesn't run long enough. I use a 55 gallon barrel and my room is like 22x10. Only comes on for a few minutes, then stays off for hours.

Click to expand...

And I think you should grow bigger plants

Mine definitely comes on more when the plants are bigger. I've tried to seal the room as best as possible. Its hard with AC hoods...even sealing the edges with packing tape and sealing the ducts. Typically mine runs about 3 times and hour for about 3-5 minutes. But then again, my flower room is CRAMMED with plants. Out of a 12X10 room the only place you can really walk is 1.5' by 10.

took me a few days but i finally made it to the end of this thread.
good read.

Congrats man. Now go pick up a pump and cheap tankless heater. Co2 baby!

Any ideas for running CO2 with a passive intake setup?

Ummm huh? Not sure what you mean.

how loud is the pump. I bought a simer 1/12 hp and everything works but it is loud. The t you mention for back pressure is it the same as the control valves you can get? female end on one end male on the other with like a ball valve with an outlet to regulate flow? than you put one in input hose and output hose and connect with a shorty hose? looks like an H when done I suppose?

my room is 10x8x8 it comes on every 20 minutes like clockwork, for 1.5 minutes. I have an element controller, with a camp chef triton propane heater. ppms go up to 2000ish and kicks on around 1450 20 min later. Kind of wish i had a controller with deadband.

Million dollar question- what is your average co2 without a burner on. I was surprised that my whole house is anywhere between 800-1150. I always thought it was more around 3-500. i know geographics and industry play a role but hmm.

My pressure relieve is a T that is placed in the line coming from the pump. The T end has a hose on it with a simple garden hose shut off controller on it. My pump is quieter with less pressure but that is because its a diaphragm pump.

The ambient co2 level is between 350-400. Slightly higher near freeways and urban areas.

Just updating my experience on these things. I've actually gone through several of them. It seems like the life-cycle on these isnt terribly long. I've tried all the low end ones from the different companies on amazon, and ebay. Probably after about 6-8 months they start acting up and will basically stop lighting. They are actually supposed to be very easy to repair if you are handy, It just seemed to complicated and risky for me. Each time it has been the same thing, a rubber peice inside wearing out, as I did have one repaired under warranty and they told me what was wrong. They are so cheap compared to tanks that I dont even care about throwing them away every 6 months and buying a new one, but recently i did get a more expensive model. Seems like much better quality, however it does work better, and my water bills have gone up since its heating more water and draining more to waste even on the lowest setting. This is the water heater I'm using now, no more batteries and much better construction. As stated before if you arent using a recirculating system of some sort it does waste more water. http://www.globalindustrial.com/g/plumbing/water-heaters/Tankless-Water-Heaters-Gas/ecotemp-tankless-gas-heaters

I think my breakage might be related to my hard water. I've tried the compatible sediment filters, but the ones I've gotten have been complete garbage and leaked badly.

I did have a rubber thing wear out and I was told that the replacement piece was of high quality. Also however, the guy told me they DO NOT like to run in hot water. So if you have a small Rez and the water is just getting hotter and hotter and hotter, then I would bet that this is causing premature failure.

The guy who sold mine has been very knowledgable and helpful. Once my gas solenoid was not activating. I called him and told him I thought it was broke because I has it out and energized it and nothing happened. He said impossible; jut clean it. I said, I'm a pretty smart guy and I can tell you it's broke.

Eet not boke, u cwean and ashremble, it wok good. I wiped off the seals and re-installed it... Son of a bitch has been working great for 4 months now.