HHO 4LPM Gas Generator

Project Specs:

  • Months of work: June 2009
  • Approximate Build Time: 3 Weeks
  • Max Voltage: 75V
  • Max Stored Energy: ~0.1MJ

This project was to build a high-output hydrogen and oxygen gas generator by building a multi-plate electrolytic cell. This cell has 36 plates and runs best at roughly 65 volts DC. This provides 1.8V per plate which is the most efficient voltage for electrolysis. By putting the plates in series, this is much easier to manage than a single electrode electrolysis system, which would require immense currents at 2V. When it is run at 70 volts it is capable of up to 4 liters per minute of gas output.

When voltage is applied to the plates, oxygen and hydrogen gas are split apart from the H2O water molecules. When the gases are ignited, the only biproduct is water as the two gases recombine. The gas was fed into a torch head and can be used to melt anything, even rocks or the hardest metals.

This was built pre-MIT, and thus my machine shop consisted of a dremel and hand drill. This was the most painful machining I ever did, clocking in at more than 40 hours of continuous dremel cutting of stainless steel plating. More than 150 cutoff discs lost their life.


Dry-Cell Electrolytic Cell



Power Supply


A video of it operating:

  1. It’s dangerous keeping hydrogen and oxygen together.
    Combustion propagates through hydrogen faster than
    the shock wave of sound can pass through the hydrogen.
    And hydrogen/oxygen does not need kindling temperature to ignite.
    Another torch I have heard of that is hotter than H2O is the “Atomic Torch”
    a D.C arc welder (as used in TIG welding) makes a good current source.
    The H2O torch is used for cleaning the sawed and routed edges of plastic
    since it leaves no residue. Carl

    • It is indeed a very dangerous thing that was made. There is a flashback arrestor in the torch head, which actually is remarkably effective against HHO flashbacks. It is just tight wet bronze wool. There are tons of videos on youtube of people testing this arrestor with a balloon of gas behind it, it actually is incredibly effective. The second PVC bubbler is also decent protection, since it is almost entirely filled with water, so the odds of it blowing are low and it’s unlikely to be hazardous. If that one also failed, then it would be very bad news.

      I don’t use this tool anymore.

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