A tank water heater may have a sacrificial anode rod that corrodes preferentially, helping protect the steel tank. Its condition depends on the heater design, water chemistry and service history. Check the model before assuming your unit has a serviceable rod.
What to look up before service
Find the model and serial number on the exterior label and check the manufacturer’s maintenance instructions. Ask whether there is enough clearance above the heater to reach the rod and whether past service records show it was replaced.
What an anode replacement can address
A new rod can help protect a compatible tank that is still sound. It cannot close a leak from the tank itself. If you see water around the heater, ask the technician to locate the leak and assess the tank before approving maintenance work.
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