If you’ve ever wondered why a metal rod sits inside your water heater, you’ve probably heard it called an "anode" or "sacrificial rod." Its job is to eat away instead of the tank, stopping corrosion and leaks. When that rod runs out, the tank starts rusting faster, which can lead to costly repairs or a new heater altogether.
Most homeowners don’t think about anodes until a problem shows up – strange noises, rusty water, or a leaking bottom. Spotting these signs early and swapping the rod can add years to your heater’s life. Below we break down why anodes matter, how to check them, and a step‑by‑step DIY replacement process you can follow with basic tools.
An anode rod is made from magnesium, aluminum, or zinc. It’s more reactive than the steel tank, so it corrodes first. This sacrificial action creates a protective electric field that stops the tank from rusting. Over time, the rod gradually dissolves. When less than half of it remains, protection weakens and the tank begins to corrode.
Replacing the rod is cheap – usually £20‑£40 for the part – and it’s a lot cheaper than fixing a leaky tank or replacing the whole heater. A healthy anode also improves water quality by reducing metallic taste and keeping the inside of the tank cleaner.
Before you start, turn off the power or gas to the heater and shut off the cold‑water supply. Drain a few gallons of water from the tank using the nearest drain valve; this reduces pressure and makes the rod easier to remove.
Locate the anode: it’s a hex‑head bolt on the top or side of the heater. Using a pipe wrench or a dedicated anode puller, turn the rod counter‑clockwise. Some older models can be stiff – a little heat from a hair dryer can loosen it. Once it’s free, compare its length to the new rod; if more than half is gone, it’s time for a swap.
Wrap Teflon tape on the threads of the new rod, then screw it in clockwise until snug. Don’t overtighten; you want a good seal but not a stripped thread. Refill the tank, turn the water back on, and check for leaks. Finally, restore power or gas and let the heater heat up. You should notice quieter operation and clearer water within a day.
If you’re not comfortable handling the heater, or if the rod is stuck and won’t budge, give a local professional a call. South Shields Appliance Repair Services can handle tough anode jobs, inspect the tank for hidden damage, and give you a quick quote. Their certified technicians know the right tools and safety steps, so you avoid accidental injury or further damage.
Regular checks are key. Most experts recommend inspecting the anode every 12‑24 months, depending on water hardness. In areas with hard water, anodes wear faster, so a yearly look‑over keeps the tank safe.
Bottom line: anode replacement is a small maintenance task that saves you big bucks and headaches. Grab a wrench, follow the steps, and you’ll extend your water heater’s life by years. If anything feels off, call a trusted local repair service – they’re just a phone call away and can get the job done fast.
Identifying a failing anode rod can prevent costly damage to your water heater. This guide explains what signs to watch for, how often to check it, and why it's essential for extending your water heater's life. Learn practical tips for inspecting and replacing this key component and simple steps to keep everything running smoothly.