I installed my electrolyzer outside of the engine compartment to reduce heat. And my bubbler is around 3feet above the electrolizer. After testing for a hour or so the electrolizer stays cool to the touch (under 120F I will say, did not measure temp) but after shutting off the system the water from the bubbler start to come down into the electrolyzer.
Has anybody had this problem?
Would a one way valve solve the problem? (This is what I am planning to try today.)