How do you maintain a Natural gas water heater?

Answer 1

As with every hot water tank, shut the power and water supplies and drain the bottom of the tank once a year to get the residual rust out of it. To keep your tank running for years without problems, change the sacrificial anode every few years. Sacrificial anode takes the brunt of the rust so the inside of the tank does not. Companies will NOT tell you this, so they can sell you another hot water tank.