I would like to know how to tell if a water-heater is approaching its useful life and needs to be replaced soon. I don't want to wait for its water tank to crack open and flood the basement before I take action.
I was planning to examine the anode rod in my 4-years old water-heater with the hope of replacing it periodically in order to extend its service life. But my basement doesn't have enough head room to extract the anode rod. Therefore, I am thinking of just waiting for it to die before I replace the water-heater and all its connecting fittings to flexible fittings (then I can disconnect them easily for periodic checking the anode rod). How can I tell when I should replace the water-heater?
Thanks in advance for any suggestion.
Jay Chan