Note that this is massive overkill. The o2/h2 rig is "always-on", meaning it runs continuously regardless of demand (as long as h2o & power are supplied. Every tile in the o2 column to the left has 385kg of o2 in it!
Why?
1) Because this way I can make the h2o supply intermittent and not worry about whether I have enough o2, cuz I've stored so much.
2) Because it enables *4* fully-loaded gas pipe outlets, which makes distribution easier.