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Hey, I live a townhouse that has a Navien on demand hot water heater, I dont knot the model as only the Maintenance guy can get in, Its run my natural gas.
Here's the issues........even when there is NO demand for hot water I can hear the unit run for about 15-25 seconds, this can happen as often as every 30 minutes. The Maintenance guy says this is normal, I dont trust him.
Can anybody explain this?