Can You Hear Water Flowing Into Empty Hot Water Heater How Long Will Your Water Heater Last? Your Anode Rods Will Tell Us

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How Long Will Your Water Heater Last? Your Anode Rods Will Tell Us


An anode rod is a rod made of “sacrificial” metal. Like batteries, the anode causes an electrochemical reaction in the tank. The anode slowly wears away instead of the tank lining. As long as the anode is present and functioning, almost all corrosion or rusting of the tank lining is prevented.


For all consumers purchasing a new water heater, an important aspect of the new appliance is access to its anode rod. At the top of the water heater is a part called a hex head. Is it visible or not. If not visible, the hex head is located under the sheet metal top or is connected under the hot water outlet. You wouldn’t have to settle for a hard-to-find anode rod. I do not recommend buying this water heater. Look for a hex head water heater that is easy to find.

With commercial water heaters, the outer sheet metal top of the water heater must always be removed to access the anode rod. The hex head is rarely found exposed, whether it is electric or gas heaters. After removing the top of the heater, mark the top of the heater itself for easier assembly later. At this point, the hex head for the anode rod can easily be found on any commercial electric heater. On gas heaters, the hex head will probably be easy to find if it has a single flue opening. If it has more than one flue, it may be harder to find.


The anode is made of aluminum, zinc or magnesium. It is designed around a wire that runs down the middle of the rod. Hard water areas of the country often have aluminum rod water heaters installed because aluminum is the best material for hard water conditions. If your anode rod has broken down to the wire or is completely gone, this is usually a sign of hard water. However, be careful with aluminum anode rods. Science believes there is a link between aluminum in the diet and Alzheimer’s disease. Do not drink or cook with hot water from a tank that uses an aluminum anode rod. To determine if you have an aluminum anode rod, remove it and then bend it. If it bends easily in your hands, it is probably made of aluminum.

Combined anode

Typically the anodes are installed with 3/4 in. hex heads bolted to the top of the tank. However, the combined anode is attached to the hot water outlet pipe fitting, also screwed on top. All water heaters have at least one anode rod. Some water heaters have a longer warranty because they have two anode rods. If there are two anode rods, it is because one is attached to the hex head at the top and the other is a combination anode attached to the hot water outlet. Some residential heaters have two anode rods with a hex head and do not have combined anodes.

To determine if you have a combined anode rod, use a pipe wrench to disconnect the hot water outlet at the top of the heater. Don’t forget to turn off the water first! Then push the hard wire into the hole where the hot water fitting was. If it stops about 3 to 6 inches directly down, you have found the combined anode. If the wire doesn’t meet anything inside, the anode is somewhere else. The combined anode can be removed with a socket wrench.

If you do not have a combined anode and want to install one, remove the hot water pipe fitting and replace it with a combined anode rod. The attachment on the anode will need to be longer than the thickness of the insulation on top of the heater, which is usually 2 to 6 inches.


Magnesium is used more often than other metals for anodes. When the water in your area is not particularly hard, magnesium rods are probably the best use. However, be careful with magnesium rods when replacing them in an already corroded tank. The electrochemical reaction of the new magnesium anode can cause hydrogen gas to build up in the tank. This may cause water leakage.


New water heaters rarely have a zinc rod already installed. Zinc bars are actually aluminum bars, with 1/10 of the bar being actual zinc. The sole purpose of the zinc in the anode rod is to reduce the smell of sulfur in the water.

Consumption of anodes

Hard water softening with salt is actually more harmful to anodes than calcium carbonate – the cause of hard water. Salt can consume the anode up to three times faster than normal. Phosphates can have the same detrimental effect on the anode. The anode should be inspected every two years or sooner if you use these water softeners.

The anode is the reason the heater remains functional for years or even decades. Anodes corrode predictably. It most often corrodes at the top or bottom and exposes the steel wire underneath.

Core wire

The water heater will only be protected if there is enough metal on the anode rod. A steel core wire holds the sacrificial metal at the anode. Be sure to inspect the anode for exposed wire core at least every two years.

When analyzing the anode rod for an exposed core wire, the wire may be coated with calcium carbonate, which is easily removed. This calcium carbonate is not corroded metal from the anode rod, so don’t worry about removing it.

Anode rating

If the anode rod has more sacrificial metal than the exposed steel rod, it is still in good shape. However, if the entire surface is covered with calcium carbonate and that calcium carbonate becomes hard, it will prevent the anode from protecting the tank any longer. This is known as passivation. If the anode is passivated, it will not look like this just to the eye. To test the passivation, you need to bend the anode rod by hand. Watch out for small amounts of peeling on the bend. The anode should be replaced if more areas of the rod are exposed wire than sacrificial metal. It should also be replaced if the top or bottom of the rod breaks, leaving six or more inches of exposed wire exposed. The anode should also be replaced if the anode is less than half the diameter of the 3/4 in. rod. If the anode has become passivated, split along its length, or has become severely pitted, it may also be time to replace it. Once all the sacrificial metal wears away, the steel bar will begin to wear. When the steel rod wears out, the only thing left will be the hex head or hot water outlet if it’s a combination anode. At this point the tank will begin to corrode. If the anode is found under the above conditions, damage to the tank may have already occurred.

Hidden hex head on newer models

Hex heads are threaded watertight plugs about 3/4 inch in diameter. They are attached to the anode rods on top of the water heaters. Some are easily visible from the top of the water heater. Other times it will be under fiberglass or under a piece of plastic. To locate the hex head, drill a shallow 1/4-inch hole through the plastic top of the water heater. Do not drill deep into the tank itself. Use a long flathead screwdriver to locate the hex head under the top of the water heater. For gas heaters, the hex head will be the same distance from the flue as the hot and cold pipes. For electricity, the anode will be off-center so it doesn’t fall on the heating elements. It may be necessary to dig a few holes to find the hex head. Once the hex head is found, it must be permanently exposed. Use a hole saw that can cut plastic or metal to cut a hole large enough to allow future access to the hex head. At this point, use two people to unscrew the hex head – one to stabilize the tank, the other to use the breaker bar and socket that fits the head. From 3/4 inch to 1-1/16 inch.

In the future, when buying a new water heater, buy only those with already exposed hex heads.

Hidden hex head on older models

To find the hex head on older water heaters, simply unscrew the screws holding the top in place, mark the placement of the top and the water heater with a marker, then remove the top to find the hex head. Unfortunately, many heaters found in buildings today have foam tops and cannot be removed. Again, if the hex head isn’t exposed when you buy it, don’t buy this tank. Look for the tank with the hex head already exposed.

Anode inspection

Anodes should be inspected at least every two years if softened water is used, but at least every four years under normal water conditions. Sometimes the location of the anode is actually written in the instructions for the water heater.

Anode installation

To remove the old rod, pull it out as far as possible, bend it, and then pull it all the way out. To install a new one, bend the rod directly in the middle, insert it halfway, align it with the opening and install it all the way. Then screw the anode rod. If you can’t screw it into place because it’s bent too much, pull it out part way and use the opening to straighten it further. If there is not enough space on the ceiling to install a new anode rod, consider a connecting anode. These anodes have many small links connected together and are similar to sausage links. You can also try zinc anodes because they bend much more easily than magnesium ones. Another way to install the anode is to empty the water heater and turn it upside down to allow easy access to the anode.


Anodes are usually 3 feet 8 inches. The anodes should be only a few centimeters shorter than the tank itself. Buy anodes that are a little too long instead of a little too short. This way you can shorten the anode if it is too high.

Impressed-Current Rod

In relation to commercial water heaters, there are embossed bars. These rods do not generate current themselves like sacrificial anodes. They get their power from a source of electricity. Many commercial heaters specify the location of the impressed current rod. They do not need to be replaced during their lifetime. They may need occasional cleaning. Simply wipe them off with a towel. If rust appears in your hot rod water heater, call the manufacturer, call a plumber, or install sacrificial anodes.

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