I tried a few kits and plans on HHO units and after much experimenting decided I could do better. 1St cell overheated and eventuall exploded ! No real problem though fitted in a safe place to an old 1.9D diesel Toyota pickup. Anyway after over 2 years experimenting and designing plus a eureka moment have developed a scaleable wet cell that can produce 6lpm at less than 10 amps! This is not lies! Not sure where to go from here with it? Let me know what you think. In spain Europe so time difference can be 8 hours! Good luck.