I'm installing a new water heater. The cold water inlet is turned off and no water is running in the house.
After attaching the hot water outlet to the water heater I can hear water flowing/dribbling into the water heater.
Does this mean I have a bad valve that is allowing cold water to back-flow to my water heater? I can't hear water flowing at any of my sinks, tubs, etc. How could I find the bad valve.
Additional information: This has been running for over an hour and even with water heater off a small stream of cold water runs from all my faucets when I turn on the hot water side of the faucet.