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I’m not sure how I would measure it to make sure, but as far as I can tell the Navien heater circulates the line ever so often to heat it up. I think put a video camera on that years ago and saw that indeed that every now and then it turns on the pump and heater. The other way I would say...

Hi everyone, First time posting here, and I appreciate any responses in advance. I'm come here lots of times looking for troubleshooting tips and have usually found what I needed without posting. But my current situation has got me stumped. I live in a house that was built 7 years ago with a...