The invention discloses a hydrogen/oxygen (HHO) system containing a HHO generator and a Zeer pot which is configured to reduce a temperature inside the HHO generator by evaporation of water on a surface of the Zeer pot. The Zeer pot contains a radiator which cools an electrolytic solution for the HHO generator. The HHO system also contains a pump and a reservoir tank which is in fluid communication with the radiator to pump the electrolytic solution from the radiator back to the HHO generator, and a demister which is installed downstream of the HHO generator to remove steam from hydrogen and oxygen gas generated in the HHO generator.