Unthread the nut to detach the burner supply tube from the gas or control valve.
Cleaning gas water heater.
Open a hot water tap close.
Shut off the gas or electricity to the water heater and open a hot water faucet and let it run full blast for about 10 minutes to reduce the water temperature in the tank.
Turn off the hot water heater.
Remove the temperature pressure release valve and screw in the vacuum adapter.
Allow the tank to drain completely flushing out flakes of mineral deposits along with the cooled water.
If necessary unthread any mounting screws and remove the burner access cover.
Open the drain valve after unscrewing the water supply line and allow sufficient time for the water to drain out of the heater into the basin.
Next unthread the nuts or screws securing the burner plate itself.
Attach the shop vacuum hose and fire up the vacuum.
Once the water has drained close the valve.
Open the drain valve at the bottom of the hot water heater tank.
Wipe the hot water heater down with a dry cloth to get rid of as much.
Before you begin be sure to unplug the water heater s power cord and shut off the gas supply.
Use the crevice.
How to clean a hot water heater.