Quote:
Originally Posted by JDickson
Why would you have to turn two or three?
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This diagram shows why there are 3 valves. When the handle is in line, water flows. When the handle is cross ways to the line, water does not flow.
Graphic used without permission.
By the way, when the heater is being bypassed (lower image) that is the time to drain the water heater and lift the pressure release valve so the water will gurgle out.