How Long Does a Water Heater Last? Lifespan, Key Factors, and Maintenance Tips
We can all agree — choosing the right water heater can be a complicated and often expensive task. And once it’s installed, the last thing anyone wants is to go through that process all over again just a few years later.
With the right tips and tricks, you will have all the information you need to help your water heater last as long as possible.
From knowing when it’s worth repairing to understanding key factors that affect lifespan, plus practical maintenance tips you can start using today, we’ll guide you through everything you need to know to protect your investment and keep the hot water flowing for years to come.
Table of Contents
- Average Water Heater Lifespans by Type
- 5 Factors That Can Affect the Lifespan of Your Water Heater
- Tips To Help Extend Your Water Heater’s Life
- Is It Worth Fixing a 10-Year-Old Water Heater?
- Is Your Water Heater Past Its Prime? Schedule an Inspection With All Pro Plumbing Today!
Average Water Heater Lifespans by Type
Most water heaters last between 8 and 20 years, depending on the type and fuel source. Here’s a quick look at average lifespans by type:
- Gas Water Heaters: 8–12 years. This type of heater is fast heating, but has more wear from combustion.
- Electric Water Heaters: 10–15 years. These heaters have fewer moving parts, and their lifespan is slightly longer.
- Tankless Water Heaters: 15–20+ years. Tankless water heaters have the longest lifespan. Of course, it all depends on having proper maintenance.
- Commercial Units: 8–12 years. Because of the high usage projected for commercial units, these heaters tend to have a shorter lifespan, and regular maintenance is key.
5 Factors That Can Affect the Lifespan of Your Water Heater
Several key factors influence how long your water heater will last. Understanding these can help you take steps to protect your investment and avoid premature replacement:
#1: Water Quality
If your home has hard water, it can lead to sediment buildup inside the tank. Over time, this sediment settles at the bottom, making your water heater work harder to heat water, reducing its efficiency, and accelerating wear on internal components.
This not only shortens the unit’s lifespan but can also lead to higher energy bills and more frequent repairs. If you suspect hard water in your area, consider installing a water softener or scheduling regular tank flushes — both services that All Pro Plumbing can provide to help protect your water heater and extend its performance.
#2: Location of the Unit
The location of your water heater plays a bigger role in its performance and longevity than many homeowners realize. Units installed in unheated areas like garages, basements, or outdoor sheds are more exposed to temperature extremes, especially in colder climates.
When temperatures drop, the water inside the tank cools faster, forcing the system to work harder and cycle more frequently to maintain the desired temperature. This constant strain increases wear on internal components, leading to reduced efficiency and a shorter overall lifespan.
In addition to temperature, environmental factors like humidity, dust, and poor ventilation can also contribute to corrosion and electrical issues. If relocating the unit isn’t an option, insulation can help.
#3: Usage Habits
Your household’s usage habits play a vital role in your water heater’s longevity. For example, your household’s size determines how much hot water will be used each day, which has a direct impact on the wear and tear your water heater experiences.
Larger families or homes with heavy usage — such as long showers, frequent laundry loads, and constant dishwashing — put more demand on the system, causing it to cycle more often and work harder to keep up. This increased workload can accelerate component fatigue and reduce the unit’s overall lifespan.
#4: Installation Quality
A poorly installed unit — often the result of rushed or DIY work — can lead to issues like incorrect venting, improper connections, code violations, or even safety hazards. These problems can shorten the heater’s lifespan and increase the risk of costly repairs down the road.
In contrast, professional installation ensures that the system is set up correctly from the start, following all safety codes and manufacturer guidelines. All Pro Plumbing offers expert water heater installation services, giving you peace of mind that your system is built to last and operate efficiently from day one.
#5: Proper Maintenance Practices
Consistent maintenance is one of the most important factors in determining how long your water heater will last. Simple tasks can prevent major issues and keep your system running efficiently.
Neglecting these routine practices often leads to premature failure and costly repairs. That’s why All Pro Plumbing recommends — and offers — regular maintenance services to help extend the life of your water heater. We go into more detail about these best practices in the section below, but it all starts with making maintenance a priority.
Tips To Help Extend Your Water Heater’s Life
A well-maintained water heater can serve your home reliably for many years. Regular upkeep not only improves efficiency and performance but also helps prevent costly repairs or unexpected breakdowns.
At All Pro Plumbing, we offer comprehensive water heater maintenance services designed to keep your system in peak condition. From flushing the tank to inspecting key components, our team is here to help you get the most out of your investment.
Flush the Tank at Least Once per Year
One of the simplest yet most effective ways to extend your water heater’s lifespan is to flush the tank annually. Over time, sediment like minerals and debris from your water supply can accumulate at the bottom of the tank.
This buildup forces the water heater to work harder, reducing its efficiency and potentially damaging the tank lining or heating elements. Flushing the tank clears out these sediments, improving performance and helping prevent costly repairs or premature failure.
Regularly Inspect the Tank
Taking just a few minutes every few months to visually inspect your water heater tank can make a big difference in preventing costly repairs or replacements down the line. Start by checking the area around the base of the tank for any signs of rust, corrosion, or moisture — early warning signs of a potential leak or structural weakness. Also, examine the seams, fittings, and valves for any drips or buildup, which could indicate slow leaks or mineral deposits.
Don’t forget to listen for unusual sounds like popping or rumbling, which may signal sediment buildup inside the tank. Catching these issues early can help you address minor repairs before they become major problems.
Inspect Other Key Components and Replace When Necessary
Anode Rod
One critical but often overlooked component is the anode rod — a metal rod located inside the tank that’s specifically designed to attract corrosive minerals and protect the tank’s interior lining from rust.
Over time, the anode rod corrodes instead of the tank, acting as a sacrificial component. However, once it becomes too corroded, it can no longer do its job, leaving your tank vulnerable to internal damage. It’s recommended to inspect and possibly replace the anode rod every 3 to 5 years, depending on water quality and usage.
Pressure Relief Valve
The pressure relief valve — also known as the temperature and pressure (T&P) relief valve — is one of the most important safety features on your water heater. It’s designed to open and release water if pressure or temperature inside the tank gets too high, preventing potential damage or even a dangerous explosion.
Over time, this valve can corrode, become stuck, or develop leaks, making regular inspections essential. To test it, carefully lift the valve’s lever and then let it snap back into place; you should hear a rush of water into the discharge pipe. If water doesn’t flow or the valve leaks afterward, it may need to be replaced.
Check Water and Gas Lines
Water lines can develop leaks due to corrosion, loose fittings, or high water pressure, while gas lines may become cracked, loose, or clogged, posing serious safety risks. Look for any signs of moisture, rust, or unusual smells near the connections.
If you notice a rotten egg odor, it could indicate a gas leak and requires immediate professional attention. Ensuring that these lines are secure and in good condition not only prevents water damage and safety hazards but also keeps your heater running efficiently.
Ensure Pilot Light and Ignition System Are Functioning Properly
For gas water heaters, the pilot light and ignition system are essential for safe and reliable operation. If the pilot frequently goes out or the burner struggles to ignite, you may end up with inconsistent or no hot water. Common causes include dirt buildup, faulty thermocouples, or a worn igniter. These issues can also lead to gas buildup, which is a safety risk.
Make sure the pilot flame is steady and blue, not yellow or flickering. Listen for delayed ignition or irregular clicking. Regular cleaning and part replacements help keep the system running smoothly.
Is It Worth Fixing a 10-Year-Old Water Heater?
Deciding whether to repair or replace a 10-year-old water heater comes down to a careful cost-benefit analysis. On average, water heaters last between 8 to 12 years, sometimes more if it is a high-quality model with excellent maintenance.
However, as they age, water heaters tend to become less efficient, and warning signs like shorter hot showers or fluctuating temperatures become more common. If the cost of repair exceeds 50% of the price of a new unit, replacement is usually the smarter move. That said, if the unit is younger and the issue is minor, repair might still make sense.
Is Your Water Heater Past Its Prime? Schedule an Inspection With All Pro Plumbing Today!
Your water heater is one of the hardest-working appliances in your home, and with the right care, it can serve you well for many years. From knowing when to repair or replace, to regular maintenance and choosing the right unit for your needs, every decision can impact its performance and longevity.
If you ever need expert guidance or hands-on help, All Pro Plumbing is here for you. With over 62 years of experience as a trusted, family-owned company, we’re proud to offer reliable, honest water heater services that keep your home comfortable and your water hot. Whether it’s a quick repair, full replacement, or annual tune-up, you can count on All Pro Plumbing to get the job done right.
