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Water Heater Anode Rod Replacement: When and Why It Matters
Most people never hear about the anode rod until the tank leaks. It is the cheapest part in the heater that decides how long the tank lasts.
Call Now – (949) 693-0298In this guide
- Rusty or brown hot water
- Rotten egg smell from hot taps
- Popping from heavy sediment
- Tank is 4 to 6 years old, never checked
What does a water heater anode rod do?
The anode rod is a metal rod, usually magnesium or aluminum, that hangs inside the tank. It corrodes on purpose so the steel tank does not. Once the rod is used up, the tank itself starts to rust from the inside, and a leak is only a matter of time. Call (949) 693-0298 to have it checked.
Replacing a worn anode before the tank rusts is one of the best ways to add years to a water heater. Our water heater repair mission viejo techs carry anodes for most brands.
How long does an anode rod last in Mission Viejo?
In hard water like Mission Viejo's, many anodes are worn down in about 4 to 6 years. Water softeners can make them wear even faster. The rod should be checked every 2 to 3 years after the heater is a few years old.
- Magnesium: protects well, but wears faster and can cause sulfur smells.
- Aluminum-zinc: a common swap when hot water smells like rotten eggs.
- Powered anode: uses a small current and does not wear away. Costs more up front.
What are the signs the anode rod is worn out?
Rusty or brown hot water, a rotten egg smell, heavy sediment popping in the tank, and a heater that is 4 to 6 years old and has never had the anode checked are the main signs. A rod that is down to bare wire needs to be replaced.
Rust in only the hot water often points to the tank, not the pipes. Read our guide on rusty or brown hot water. A sulfur smell is covered in our rotten egg smell guide.
Can you replace an anode rod yourself?
It is possible, but it is harder than it looks. The rod's hex head is often seized and needs a long breaker bar, the water must be shut off and pressure relieved, and there may not be enough ceiling space to pull a long rod out. Flexible link rods help in tight garages.
A technician can also check the tank, the relief valve and the sediment at the same visit. A flush costs about $120 to $250 and pairs well with an anode swap.
Is it worth replacing the anode on an older heater?
If the tank is under about 8 years old and not leaking, yes. An anode swap costs about $200 to $450 and can add years. If the tank is already rusting through or leaking, the anode will not save it, and replacement is the better spend.
See how long water heaters last to judge the age. When it is time, our water heater replacement mission viejo page explains the choices.
Frequently asked questions
How often should a water heater anode rod be replaced?
In hard water areas like Mission Viejo, check it every 2 to 3 years and expect to replace it about every 4 to 6 years.
How much does anode rod replacement cost?
In Mission Viejo, anode rod replacement usually costs about $200 to $450.
What happens if you never replace the anode rod?
Once the rod is gone, the steel tank starts to rust from the inside. That shortens its life and leads to leaks.
Can an anode rod cause rotten egg smell?
Yes. Bacteria in the water can react with a magnesium anode and make hydrogen sulfide. An aluminum-zinc anode often fixes it.
Talk to a water heater pro now
Questions about your water heater? Call a local pro in Mission Viejo, CA. Open 24 hours a day, 7 days a week.
(949) 693-0298 Call Now – (949) 693-0298