Quote:
Originally Posted by bevedfelker
As the name implies, these valves by pass the water heater so that when you winterize you don't fill your water heater with 6 gallons of RV anti freeze. There should be 3 valves very close to the water heater. One valve will close off the cold water input to the water heater, another valve will cutoff hot water output from the water heater.
The third valve is on the water line that connects the water heater cold water inlet and hot water supply line. This is the bypass valve. When closed (normal operating position) cold water enters the water heater and hot water exits the heater into the hot water supply line. When open (winterizing position) and the other two valves are closed, the antifreeze will be syphoned up through the water pump and enter the cold water supply lines. It will then flow through this water heater bypass valve and flow into the hot water lines (bypassing the water heater). In this way there is antifreeze in all your plumbing.
You also need to be sure that you removed the plug from the bottom of the water heater and drained the water from the water heater tank.
Attached drawing is a schematic of the three valves and how the systems should be configured for normal operation and for winterizing.
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As my question states, on a Miramar is the water heater bypass the only valve?
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