The Rio Water Torch seems to do the same thing as the Hydroflux
welder. Only the Rio torch gets hotter (6000F vs 4850F).
It seems that you missed a bit of about water torches. I
don’t know specifically about the Rio or Hydroflux units, but all
the units I’ve encountered work in essentially the same way: they
produce oxygen and hydrogen by passing an electric current through
It happens that the ratio of the two gasses are just right for
burning, but the there are some problems with using just oxy/hydrogen
for soldering: the flame is just about invisible, the temperature is
too high at 3,300 degrees C (5,972 F), and there is not really a lot
of heat (there is more heat in a cup of boiling water than there is
in a red hot needle).
To combat these problems, the oxy/hydrogen is passed through a
container of liquid before it gets to the torch. The container is
known as the ‘gas booster’ and the liquid can be water, or something
volatile such as meths, MEK, methanol, etc.
The liquid serves as a flashback arrester, and also as a means of
regulating the flame temperature.
Water doesn’t change the flame temperature and the flame remains
invisible, but MEK reduces the temperature to about 1700 C (3092 F),
and methanol to about 2700 C (4982 F). I think meths is somewhere in
between. As well as reducing the flame temperature, the volatile
fluid in the booster also increases the specific heat of the flame,
making it easier to use.
Regards, Gary Wooding