STRAY VOLTAGE STOPS HERE Hot Refrigerant Gas Can Pass
Although titanium eliminates chemical corrosion in even the harshest pool water, a small number of heat exchanger failures occur in pool heaters found to have stray low voltage traveling to or from the pool water through the heat exchanger, which would cause corrosion no matter what metal was used.
With the aid of sensitive digital volt meters, field servicemen can actually measure stray voltage between the heat exchanger and the power supply ground wire or local earth grounding rods required for pool equipment bonding. Floating grounds on power supplies, electronic chlorinators and even underwater pool lights can leak harmless low voltage electricity, less than 3 volts, into the pool which force electrolytic corrosion of the heat exchanger in a matter of weeks.
As the drawing shows, Heat Siphon uses a patented design electrically isolated Titanium fitting which seals the hot refrigerant gas inside the metal tube walls using o-rings, and a separate set of non-metallic insulator rings outside the first seal to break the conduction path normally made by the metal tube. Since the heat exchanger housing is connected to PVC schedule 40 piping and the shell is fabricated entirely out of injection molded or extruded PVC plastic, it also provides isolation from any stray voltage.