Proper Way To Install Water Heater Expansion Tank. Not having a thermal expansion tank is the most common reason for a dripping. It is recommended to install the thermal expansion tank on the cold water line, horizontally and close to the water heater.
When it's installed and working properly, some water will enter the tank but the weight will not be too excessive. Install the expansion tank in the system (refer to figure 1). 1 now, the question is how to install an expansion tank on a gas water heater.
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