It's important to keep your water heater in a good state if you want to have it with you for a long time to come. One of the ways in which you might be able to take the best care of it is to do a heater inspection on a regular basis. Do this inspection the right way so that you'll be able to find out if anything needs a fix, which you should do right away.
The first step in your inspection is to check the thermostat and make sure that you can adjust it. You shouldn't take it apart unless there's an issue with it that calls for this. Turn the thermostat on and head to the furnace to check if it's working. If it is, the inspection can now begin in earnest.
Have a look at the flue, the vent, and other parts of the heater. Next, head outside and look at the flue and combustion air. Remember to check the air filter and make sure that once the heater has been turned on, the gas runs well, the draft fan runs, and the burners turn on the right way. Finally, make sure that each room in the house is receiving heat through the vents and you'll have performed a proper heat inspection.