A DIY guide of the electric water heater maintenance and how cleaning and tune-ups can prevent or reduce problems such as the noise, sediment buildup, no hot water, not enough hot water, low pressure, stinky water, and other issues.
It is important to know that the properly maintained water heater ensures excellent performance and efficiency, dependable, long-term and worry-free operation.
An electric water heater does not have a complicated design as the gas counterpart, so it is simpler and easier to maintain it.
Some work can be done by the homeowner, while more complicated, especially when the electrical work is involved, should be done by the licensed contractor.
If you do not want to read this step-by-step guide and just want it done - contact a plumber.
First of all, our suggestion is to read the manufacturer’s manual carefully; the best will be a day before you perform the maintenance, so that you can prepare all the necessary tools.
Visual inspection is the first thing you want to do. This involves checking for any leaks, corrosion, obstructions, deformations and other unusual conditions. Leaking, for example, is mainly coming from the rusty storage tank and lose connections and it results in a water puddle at the base of the unit.
One of the major problems with the tank-type electric water heaters are the mineral sediments, dirt and deposits sitting at the bottom of the heater. Most of the user complaints are related to hard water, the main cause of the problem, which is affecting the efficiency, hot water output and durability of the heating unit. The hard water and similar issues are related mainly to home plumbing that is attached to the well systems.
If this is not an option, then the regular electric water heater maintenance might be adequate, if done correctly and frequently. It is suggested by experts to drain 1-2 gallons every month which can help cleaning the tank from dirt. Draining is a simple operation which helps the heating system run smooth.
Draining and flushing will also remove the scale build-up from the heating elements, so the energy transfer is almost as high as the new element. Draining/cleaning will also eliminate the hissing or singing sound produced when the heating elements are covered with the limescale.
Alternatively, you can refer to this guide and check out how to remove the heating elements. Once removed, use a vinegar/water solution to remove the scale buildup.
Use the multimeter to test the thermostats for the proper work. Larger water heaters have two thermostats, while smaller, with the capacity of fewer than 30 gallons - only one. Testing should include both. The idea is to check is there a power coming to the elements and tighten the wires if these are loose. Refer to an article about thermostats to learn more about installation, testing, replacing...
Check the settings on the thermostat – you want it in the range from 120-125 F, which is factory set to prevent scalding burns and reduce the high energy bills. If the water heater is older, than put an insulation blanket around the tank to reduce the energy loss.
An anode rod protects the water heater from corrosion. It is known as the sacrificial rod for a reason. It sacrifices itself (deteriorates), so the metal tank is protected from the aggressive water action. It is made of steel coated with magnesium or aluminum-zinc compound, softer material, so that it can be used up before the metal tank.
It can last an average 5 years, sometimes longer (depends on the water quality and usage), so if not maintained regularly and replaced when needed, the lifetime of a water heater gets shorter.
A simple checking of an anode operating status, as part of the regular unit maintenance, can make the difference in the unit’s condition and performance. Also, the proper selection of an anode, when replacing the old, can make the difference between the rotten egg smell and no odor.
An anode rod, which is installed on top of the heater and submerged into the water can be easily removed for checking, using the right tool, such as the wrench or 1 1/16 socket (most often).
Before you remove the rod, turn the power off on the circuit breaker and shut the water off on the main valve. Drain a few gallons of hot water through the drain valve, and only then you can remove it.
Inspect the rod and if more than 6” of the core wire is exposed on either side of the anode, replace it. Refer to an article that explains how to replace an anode rod and get more information.
Some manufacturers recommend frequent inspection – at least once a year, but it depends on the water quality, like hardness, and usage of the water softener.
The dip tube or the cold water inlet is used to bring the cold water inside the water tank heater. Cheaper heaters have low-quality dip tubes, while more advanced have better dip tubes that can last longer and help in reducing the scale buildup inside the tank.
As the water heater ages, the dip tube, as the other elements, loses its functionality and can break, crack or split. So instead of bringing the cold water to the bottom of the tank, the deformed tube does it at the top of the heater, where it mixes with the hot water and delivering not as much hot water, resulting actually in cold showers.
As the element is brittle, it can break into small pieces, leaving the white fragments clogging the fixture aerators and other elements, affecting the unit’s efficiency and performance.
Taking into account the above, it is important to inspect the dip tube at least once a year, or when experiencing the problem such as described above.
Removing the dip tube for testing or replacing is easy, just follow the instructions.
It is crucial to have the temperature and pressure relief valve working correctly – because this is a safety element that will protect the unit from an extreme pressure development. It is not recommended to repair it, but replace it.
It should be tested at least once in six months or often if there is a reason, such as the scale buildup due to hard water and well water supply.
If the water is dripping from the TPR valve, and cannot be closed properly, then it should be replaced.
If the TPR valve doesn't work, pressure, inside the tank can build up so high that will cause the damage, rupture of the unit, even explosion.
This is how a TPR valve should be tested:
To unscrew the TPR valve use the pipe wrench.
If the heater is to remain idle for a while (you are on vacation or absent for some time, for example), the electrical power and water should be turned off. A water heater should never be left empty.
Proper electric water heater maintenance is essential for efficient and economical water heating. It is not as difficult as maintaining the gas unit, but it still takes a few hours. With the above listed and explained procedures, maintenance becomes simpler, resulting in plenty of hot water and fewer problems and complaints.
How to maintain a tank-type water heater
Maintaining an electric water heater
How to drain a water heater
How to flush a water heater
How to extend the life of a water heater
How to winterize a tankless
How to vent a gas water heater
How to improve water heater safety at home