What Is HHO Gas? HHO gas is a newer form of gas that is created by using ‘pules electrolysis’ equipment. Being made up of magnecules that contain hydrogen gas, HHO is connected to lone atoms that are oxygen atoms, by “magnecular bonds”. The HHO theory first begun in the year of 1875 with a man by the name of Jules Verne. Mr. Vernes believed that water would one day be used as a fuel, with hydrogen and oxygen to support it.