Many homeowners pay little attention to their water heater until it fails, often at an inconvenient time. This essential appliance works silently in the background, providing comfort through hot showers and clean dishes. Yet there are several maintenance and safety details that may help reduce costs, support longer service life, and lower certain risks.
1. Sediment Buildup Can Affect Water Heater Performance
Over time, minerals and other particles in your water supply may accumulate at the bottom of a conventional tank water heater. Sediment buildup can interfere with heat transfer, contribute to operational problems, and affect energy efficiency, depending on the equipment and the amount of buildup.
Periodic tank flushing may help remove accumulated sediment, but maintenance requirements vary by manufacturer and model. Tankless water heaters have different maintenance needs and may require periodic descaling, particularly in areas with hard water. Follow the manufacturer’s instructions or consult a qualified plumbing professional before performing maintenance.
Example for Tankless Water Heaters: Chromex Tankless Water Heater Flush Kit. Designed for maintenance and descaling of compatible tankless systems. Check your water heater manufacturer’s maintenance instructions before selecting a cleaning kit or descaling solution.
2. Water Heater Temperature Settings Matter
The temperature setting on your water heater can affect energy consumption, scalding risks, and water quality. Some water heaters operate at 140°F (60°C), while approximately 120°F (49°C) may be appropriate for many households.
According to the U.S. Department of Energy, setting a residential water heater to approximately 120°F may offer several benefits:
- Reduce energy consumption and heat loss from stored hot water
- Lower the risk of scalding at faucets and showers
- Help reduce certain mineral deposits and corrosion under some conditions
- Reduce the amount of energy needed to maintain stored water at higher temperatures
However, lower temperatures are not appropriate for every situation. The Centers for Disease Control and Prevention (CDC) explains that maintaining stored water at higher temperatures, such as 130°F to 140°F, can help control bacteria such as Legionella. Higher temperatures also increase the risk of burns.
For some households, thermostatic mixing valves can help provide lower water temperatures at faucets and showers while allowing the water heater to maintain a higher storage temperature.
Before changing your water heater’s temperature setting, review the manufacturer’s instructions and consider your household’s needs. A qualified plumbing professional can help determine an appropriate setting, particularly when young children, older adults, or people with increased health risks live in the home.ce water-heating energy use, although the actual savings will vary by household, equipment, and usage.
3. The Anode Rod Helps Protect Your Water Heater From Corrosion
Inside many conventional tank water heaters is a metal component called a sacrificial anode rod. Typically made from magnesium or aluminum, this rod gradually corrodes to help protect the tank’s steel interior from corrosion.
As the rod deteriorates, its ability to protect the tank may decrease. Periodic inspection and replacement, when necessary, may help extend the water heater’s service life. How often the rod needs attention depends on water chemistry, usage, the water heater’s design, and the manufacturer’s recommendations.
Some homeowners may also encounter powered anode rods, which operate differently. Instead of gradually dissolving, these systems use a small electrical current to help protect the tank from corrosion. They generally require an electrical connection and must be compatible with the specific water heater. For an explanation of the differences, see this comparison of powered and traditional anode rods.
Before replacing an anode rod or installing a powered version, check your water heater manufacturer’s instructions or consult a qualified plumbing professional.
Product Example: Powered Titanium Anode Rod for Water Heaters
This is an example of a powered anode rod, which differs from a traditional sacrificial rod. Check compatibility with your water heater before purchasing. Manufacturer claims concerning odor reduction, corrosion protection, product warranties, and service life should be verified for the specific model.
4. Your Water Heater Has an Expected Service Life
Conventional storage-tank water heaters often last approximately 10 to 15 years, while many gas tankless models have an estimated service life of around 20 years. According to the U.S. Department of Energy, estimated service life varies by water heater type. Actual lifespan also depends on water quality, maintenance, installation conditions, and usage.
Homeowners can usually find the manufacture date by checking the manufacturer’s label or decoding the serial number. Because serial number formats vary, the manufacturer’s website or customer service department may help confirm the unit’s age.
As a conventional tank water heater approaches 10 years of age, consider having its condition evaluated and begin planning for an eventual replacement. Signs such as recurring leaks, visible corrosion, unusual noises, or declining performance may warrant earlier attention. Replacing an aging unit before it fails may reduce the risk of unexpected water damage, although age alone does not mean replacement is immediately necessary.
5. Pressure Relief Valves Need Regular Inspection and Testing
The temperature and pressure relief valve, commonly called a T&P valve, is an important safety device on storage-tank water heaters. It is designed to release water if the temperature or pressure inside the tank exceeds safe operating limits.
Manufacturers recommend periodic inspection and testing of this valve. However, testing can release extremely hot water, creating a scalding hazard. An older or defective valve may also fail to reseal properly after testing.
According to A. O. Smith’s water heater maintenance guidance, inspection and testing should follow the instructions provided for the specific water heater and valve.
Homeowners who are unfamiliar with the procedure, notice corrosion or leakage, or are uncertain about the condition of the discharge pipe should have a qualified plumbing professional inspect the system.
Important: Never cap, plug, or block a T&P valve or its discharge pipe. Water leaking or discharging from the valve should be evaluated promptly rather than ignored.
EXAMPLE: Temperature and Pressure Relief Valve
(Click image to see more info)
6. Does Your Water Heater Need an Expansion Tank?
When water heats up, it expands. In some homes, plumbing components such as check valves, backflow preventers, or certain pressure-reducing valves can prevent expanded water from flowing back toward the public water supply. This creates what plumbers call a closed plumbing system.
In a closed system, thermal expansion can increase water pressure and place additional stress on plumbing connections, water heaters, and other components. A properly sized thermal expansion tank provides space for the expanding water and helps manage these pressure increases.
According to the International Plumbing Code’s thermal expansion requirements, closed plumbing systems supplying storage water heaters may require an approved thermal expansion control device. Specific requirements depend on locally adopted plumbing codes and the home’s configuration.
Not every water heater requires an expansion tank. If you’re unsure whether your plumbing system is closed, or you notice repeated pressure-relief valve discharge or unusual pressure fluctuations, have a qualified plumber evaluate the system. Proper sizing, installation, and maintenance are important for reliable operation.
7. Hard Water Can Affect Water Heater Performance and Service Life
Hard water contains dissolved minerals, primarily calcium and magnesium. When water is heated, these minerals can form deposits known as scale inside water heaters, pipes, and plumbing fixtures. According to the U.S. Geological Survey (USGS), mineral scaling can reduce water heater efficiency, increase heating costs, and contribute to equipment wear.
The amount of buildup depends on water hardness, temperature, household water use, and the type of water heater. Tankless models may also develop mineral deposits in their heat exchangers, making manufacturer-recommended descaling particularly important.
A whole-house water softener may help reduce mineral scaling, but installation involves an initial expense and ongoing maintenance. Before investing in one, homeowners can check their local water utility’s water quality report or have their water tested to determine its hardness.
For homeowners in Irvine, Newport Beach, and surrounding Orange County communities, understanding local water conditions and following the manufacturer’s maintenance instructions may help prevent avoidable problems. A water softener isn’t necessary for every household, and the benefits should be weighed against its cost and maintenance requirements.
8. Gas Water Heaters Need Proper Ventilation
Gas water heaters burn fuel to heat water. If combustion is incomplete or the venting system is damaged, blocked, or improperly installed, carbon monoxide (CO) can accumulate indoors. This colorless, odorless gas can cause serious illness or death. Learn more in my article, Carbon Monoxide: The Silent Killer in California Homes.
Proper venting and adequate combustion air are important for safe operation. Keep stored items and combustible materials away from the water heater according to the manufacturer’s clearance requirements. Do not block ventilation openings or attempt to modify the venting system.
According to SoCalGas appliance safety guidance, natural gas appliances should be inspected regularly by a qualified professional or the gas utility, generally at least annually or as recommended by the manufacturer. A disconnected or damaged vent should be evaluated before the appliance is operated again.
Carbon monoxide alarms are also important. Under California’s residential carbon monoxide alarm requirements, alarms are required in specified locations, including outside separate sleeping areas and on every occupiable level of a dwelling when the applicable conditions are met. Follow the alarm manufacturer’s placement instructions rather than assuming an alarm belongs directly beside the water heater.
If a carbon monoxide alarm sounds, leave the home immediately and contact emergency services from a safe location. Do not reenter until emergency personnel indicate that it is safe.
9. Water Heating Can Be a Significant Part of Home Energy Use
Water heating represents a meaningful portion of household energy consumption. According to the U.S. Department of Energy, water heating typically accounts for approximately 18% of residential energy use, although the percentage varies by household, climate, and equipment.
Several improvements may help reduce water-heating energy consumption:
- Insulating older storage tanks: Some older conventional water heaters may benefit from an insulating blanket that reduces standby heat loss. Check the manufacturer’s instructions before installing one. Do not cover ventilation openings, controls, or safety components, and do not wrap heat pump water heaters.
- Insulating hot water pipes: Proper pipe insulation can reduce heat loss as hot water travels through the plumbing system. According to the Department of Energy’s guidance on pipe insulation, insulating hot water pipes may reduce energy waste. Any changes to the water heater temperature setting should also account for household safety and water quality.
- Reviewing hot water usage: Shorter showers, efficient showerheads, and reducing unnecessary hot water use may help lower energy consumption. Running appliances during off-peak electricity hours may reduce costs under certain utility rate plans, but it does not necessarily reduce the amount of energy consumed.
- Considering more efficient equipment: Tankless water heaters may use less energy than conventional storage-tank models in some households. Heat pump water heaters are another option and can be significantly more efficient than conventional electric resistance models. Compare equipment costs, installation requirements, household demand, and expected operating expenses before replacing an existing system.
The best approach depends on your current water heater, how much hot water your household uses, and whether the cost of an improvement is reasonable compared with its expected savings.
10. Some Water Heater Repairs Are Better Left to Professionals
Certain water heater maintenance tasks may be manageable for homeowners who understand their equipment and follow the manufacturer’s instructions. However, even routine procedures, such as flushing a storage tank or inspecting an anode rod, can involve hot water, pressurized connections, and other hazards.
Repairs involving gas lines, electrical components, combustion systems, temperature and pressure relief valves, or significant plumbing modifications should generally be handled by qualified professionals.
Before attempting maintenance, review the manufacturer’s instructions and consider the risks involved. The U.S. Department of Energy’s water heating guidance provides information about water heater types, efficiency, and maintenance considerations.
If a water heater shows signs of leaking, overheating, electrical problems, or improper gas combustion, avoid attempting repairs beyond your training and experience. A qualified plumbing or HVAC professional can evaluate the equipment and recommend appropriate repairs.
The cost of professional service may be worthwhile when compared with the potential consequences of an improperly performed repair.
Final Thoughts
A water heater can operate for years without attracting much attention, but its condition, age, and maintenance needs deserve occasional review. Recognizing warning signs, following the manufacturer’s recommendations, and knowing when to call a qualified professional may help homeowners avoid unexpected problems.
Whether you’re maintaining an older water heater or considering a replacement, understanding how your equipment works can help you make informed decisions about safety, operating costs, and future repairs.
For homeowners preparing to sell in Irvine, Newport Beach, or surrounding Orange County communities, the age and condition of a water heater may become part of a buyer’s inspection and repair discussions. Reviewing maintenance records and addressing known problems before listing may help reduce questions during the sale. Once your home is ready for the market, how you present it and reach potential buyers becomes another important consideration.
As an Irvine Real Estate Broker and REALTOR® serving Irvine and surrounding Orange County communities, I use modern marketing methods, including custom video and social media reach, to help my sellers’ homes attract more attention.
Rather than relying only on buyers finding your listing, I work to put your home in front of potential buyers where they’re already spending time: on social media, watching videos, and browsing online from their phones, tablets, televisions, and computers. This includes people who may be considering a move but haven’t started actively searching for a home.
Sometimes, seeing the right home at the right time is enough to turn someone’s curiosity into genuine interest.
I don’t just wait for buyers to find your home. I help potential buyers discover it.
Tony Babarino
Irvine Real Estate Broker | REAL Broker
California DRE#01717758
Call/Text: (949) 633-6741
REFERENCES:
A. O. Smith: Water Heater Maintenance Guide
https://www.hotwater.com/info-center/water-heater-maintenance.html
Water Heater Hub: How to Determine the Age of a Water Heater
https://www.waterheaterhub.com/water-heater-age-lookup/
U.S. Department of Energy: Energy Saver Guide
https://www.energy.gov/sites/default/files/2022-08/energy-saver-guide-2022.pdf
Centers for Disease Control and Prevention (CDC): Preventing Waterborne Germs at Home
https://www.cdc.gov/drinking-water/prevention/preventing-waterborne-germs-at-home.html
SoCalGas: Appliance Maintenance and Safety
https://www.socalgas.com/safety/safety-and-prevention/appliance-maintenance-and-safety
U.S. Geological Survey (USGS): Hardness of Water
https://www.usgs.gov/water-science-school/science/hardness-water
ENERGY STAR: Water Heater Efficiency and Certification Criteria
https://www.energystar.gov/products/water_heaters/residential_water_heaters_key_product_criteria
ENERGY STAR: Heat Pump Water Heaters
https://www.energystar.gov/products/heat_pump_water_heaters
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