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Hi my name is Robert....
I would look for a check valve on the back of the water heater, below is a picture, on the picture it shows it on the hot side (the top) however you could have one on the cold side as well, the check valve will be brass or plastic and have tiny arrows on it for direction of flow, when they fail the spring and disc can fall out and you will get no flow. Let me know if you still need more help, follow ups are included..... Robert