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A water heater bypass is usually constructed of three valves. One shuts off the cold water input to the tank, the second cuts of the hot water output from the tank, and the third opens up a path to piping that allows you to blow out and run antifreeze into the hot water lines of your trailer. So you are closing 2 and opening 1. For some Airstreams there is a fourth valve which shuts of the water supply to an external water valve.
The most common error by new owners is forgetting to close the bypass line valve in the spring. The common symptom being a lack of hot water even though water is flowing.
Jack
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Jack Canavera
STL Mo.
AIR #56 S/OS#15
'04 Classic 30' S.O.,'03 GMC Savana 2500
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Linear Mode
