Anode Rod Guide: Why It Matters and How to Check Yours

If your hot water suddenly runs cold or you notice rusty water, the culprit is often the anode rod. This humble metal rod sits inside every tank‑type water heater and sacrificially attracts corrosion so the rest of the tank stays safe. Ignoring a worn‑out rod can mean a leaky heater, a pricey replacement, and a cold shower you didn’t sign up for.

What Exactly Is an Anode Rod?

An anode rod is a long, usually magnesium or aluminum, piece of metal screwed into the top of the water heater. It’s designed to be the first thing that corrodes. Think of it like a sacrificial pawn in a chess game – it takes the hits so the real pieces (the tank walls) don’t break.

There are three main types: magnesium (most aggressive, good for soft water), aluminum (better for hard water), and zinc‑aluminum (works well in areas with a lot of chlorine. The right type depends on your local water chemistry, but most UK homes get away with magnesium.

How to Inspect and Replace Your Anode Rod

Checking the rod is easier than you think and takes about 15 minutes. First, turn off the power or gas to the heater and shut off the cold‑water supply. Let the tank cool for a couple of hours – hot water can scorch you.

Grab a ½‑inch wrench, locate the hex head on top of the heater, and loosen it. Pull the rod out; if it looks mostly corroded, pitted, or less than half its original length, it’s time for a new one. New rods usually come with a small washer and screwdriver‑type slot for easy removal.To install, wrap Teflon tape around the new rod’s threads, screw it in hand‑tight, then give it an extra quarter turn with the wrench. Turn the water back on, let the tank fill, then restore power or gas. Within a few minutes you should see water flow normally.

Pro tip: set a reminder in your phone to check the rod every two years. Most homeowners skip this step and pay for a full heater swap later. A quick inspection now can save you hundreds.

Remember, if you’re uncomfortable with any step – especially dealing with electricity or gas – call a local pro. Taunton Appliance Repair Solutions can handle the job fast and at a fair price.

Bottom line: the anode rod is the unsung hero of your hot‑water system. Keep it healthy, and your water heater will thank you with endless hot showers and fewer emergency calls.