Anode Rod Replacement – Simple Steps to Protect Your Water Heater

Every water heater has a hidden hero: the anode rod. It’s a cheap metal stick that eats away instead of the tank. When it’s gone, the tank starts rusting fast and you could lose a whole heater. That’s why swapping the rod before it’s dead saves money and hassle.

How to Know the Anode Rod Needs Replacing

The rod looks like a long, thick screw at the top of the heater. Pull it out and check the metal. If you see a lot of white crust, a lot of corrosion, or the rod is less than an inch thick, it’s time for a new one. Some homeowners count the years – most rods last 3‑5 years in hard water, up to 10 years in soft water.

DIY Anode Rod Replacement – What You Need and How to Do It

Grab a few basics: a new anode rod (match the size and material – magnesium, aluminum or zinc), an 18‑mm (or 3/4‑in) socket, a wrench, and a garden hose. Follow these steps:

1. Turn off power or gas. For electric tanks, flip the breaker. For gas, shut the gas valve.

2. Shut off cold water. Close the main supply valve to stop water flowing into the tank.

3. Drain a few gallons. Open a hot‑water faucet and let a bit of water out – this reduces pressure inside.

4. Locate the rod. It’s usually on top of the heater, covered by a small plastic cap.

5. Unscrew the old rod. Use the socket and wrench – it can be tight, so a little extra force is normal.

6. Insert the new rod. Thread it in clockwise until snug. Don’t over‑tighten – you want a solid seal but not stripped threads.

7. Re‑fill and restart. Open the water supply, let the tank fill, then turn the power or gas back on.

If the rod is stuck, a little penetrating oil can help, but don’t force it too hard. If you’re uncomfortable, call a pro.

Cost, Benefits and When to Call a Professional

A basic magnesium rod costs around £15‑£30. Adding labor, a plumber might charge £50‑£80 for the visit, so the whole job is usually under £120.

The payoff is big. A healthy rod stops rust, which means the tank lasts longer – often adding 5‑10 years to its life. It also keeps water tasting fresh and avoids costly leaks.

Call a professional if you have a sealed‑in tank (some modern models hide the rod), if the heater is still under warranty (you might void it by DIY), or if you notice leaks after the swap.

Bottom line: checking the anode rod every couple of years is a tiny effort that protects a big investment. Keep a spare rod on hand, note the replacement date, and you’ll enjoy hot water without surprise breakdowns.