Electric Water Heater Repair
Guide
Traditional Type
Circulating Systems
Cold Water Return
Type Systems
Thermo siphon
Type Circulating
Systems
Thermo-siphon Hot Water Circulating System
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Thermo-siphon Hot Water Circulating System
A thermo-siphon hot water circulating system does not require a pump but relies instead on the principle that hot water rises. In this type of system the water heater must be substantially below the level of the fixtures to work.
The piping from the water heater must rise from the water heater to the fixtures which must all be well above the water heater. Hot water from the water heater rises into the piping, circulates past the fixtures and flows back into the water heater at a much lower temperature. (As it cools off, the water gets heavier.)
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