Experimenters are using many different methods to create heaters that
use HHO as fuel. Some even use Hydrogen as a fuel. I have attached some
of the videos I found on youtube.com. They are examples of works in
progress. If you watch them, you will notice that there is nothing
special about any of the HHO electrolyzers. The electrolyzer needs to be
able to produce the amount of heat you plan on using. It needs to be
equipped with a bubbler, and possibly a scrubber, and most definitely a
good flash back arrestor. You may also want to monitor voltage,
amperage, and wattage. For regulating the flame, I suggest using a PWM
to control the amperage.
The most promising Heater seems to be the one using an automobile
Catalytic Converter. Using the converter, the HHO gas is injected into
the converter and onto the honeycomb plate inside. The converter will
heat the metal, without the use of a flame. More than 500 degrees F has
been measured. If the injector tip gets too close, the glowing metal
will ignite the torch (HHO tip). JDC Products, and delvis11, on youtube.com have videos explaining the operation. It is fascinating.