The most common parts to break or wear out on a water heater are the anode rod, heating elements (electric), thermocouple or gas valve (gas), and the Temperature and Pressure (T&P) relief valve. The metal tank itself can also rust or crack over time, requiring full replacement.
Water heaters fail primarily due to age, internal corrosion, and sediment buildup. Over time, water and heat cause metal components to deteriorate, causing the unit to eventually leak, lose hot water, or burst.
Q: How long do most water heaters last? A: Traditional tank water heaters usually last 8–12 years, while tankless units often last 15–20+ years.
Water leaks are perhaps the most common type of water heater issue you'll face. Any water heater will start to leak eventually, as by nature water will eventually corrode your tank and create microscopic cracks or fractures. However, this isn't always a sign that your tank is what's leaking.
A: Common causes of water heater malfunctions include sediment buildup, faulty heating elements or thermostats, corroded anode rods, and excessive water pressure.
Signs a Water Heater is Going Bad
Electric vs. Gas Safety Limits: With electric water heaters, minor external leaks may allow brief continued use, provided water isn't contacting any electrical components. For gas heaters, any gas smell or pilot light issues demand immediate shutdown and professional assessment.
If your tank water heater is more than 10 years old, it may be time to consider replacing it. With proper maintenance, a tank water heater tank should last six to 12 years. A tankless water heater can last for more than 20 years. Check your water heater's warranty for the most accurate timelines.
A bad thermostat—whether in your vehicle or your home’s HVAC system—fails to regulate temperature. In cars, it causes engine overheating or poor fuel efficiency. In homes, it leads to unresponsive systems, short cycling (turning on and off rapidly), or incorrect temperature readings.
Common reasons a hot water heater stops working include tripped circuit breakers, failed heating elements (electric), faulty thermocouples or pilot light failures (gas), and heavy sediment buildup. Other causes include broken dip tubes, faulty thermostats, or the unit reaching the end of its 10–15 year lifespan.
Replace your water heater if it is leaking from the tank, shows visible rust, or is over 8–12 years old. You should also consider replacement if you notice rumbling/banging noises, a drop in hot water capacity, or require frequent, costly repairs on an aging unit.
A new 40-gallon water heater costs between $𝟒𝟎𝟎 and $𝟐,𝟎𝟎𝟎 for the unit alone, depending on the fuel type, brand, and efficiency. When factoring in professional installation, the total typically ranges from $𝟖𝟎𝟎 to $𝟑,𝟎𝟎𝟎.
When searching for the most reliable water heater, professional plumbers consistently recommend A.O. Smith, Bradford White, and Rheem. For long-term tank durability and a "set-it-and-forget-it" experience, A.O. Smith and Bradford White are top choices. If you prioritize high-tech smart features and energy efficiency, Rheem is a market leader.
Water heater explosions are rare but possible when pressure builds inside the tank. A faulty temperature and pressure (T&P) relief valve is the most common cause. Sediment buildup, overheating, or corrosion increase internal pressure and risk.
Understanding the value of scrap water heaters can significantly impact your bottom line. With steel prices ranging from $0.05–$0.08 per pound, a standard residential tank can yield $10–$25. Larger commercial units may bring in $50 or more. Staying informed about market fluctuations is crucial for accurate estimates.
When your water heater breaks, immediately shut off the water supply to the tank and cut the power (or gas) to prevent flooding, fire, or further damage. Next, document the damage, clean up standing water, and contact a licensed plumber or your insurance company.
A plumber isn't usually needed for thermostat replacement unless your thermostat directly controls a water-based heating system, such as underfloor heating or a boiler with complex plumbing connections. Even then, an electrician is typically the right professional to handle the wiring.
To test a thermostat without removing it, the method depends on whether you are checking a vehicle or a home HVAC unit.
A bad or broken thermostat may make your heating system work overtime. Imagine your heater running non-stop, even when your house feels like a sauna. This happens when the thermostat fails to detect the correct temperature, resulting in the heating system staying on longer than needed.
Key signs your water heater is failing include active leaks, rust-colored water, loud popping noises, and a lack of hot water. If your unit is over 10 years old or requires frequent repairs, it is likely nearing the end of its lifespan.
Water heaters typically need replacement every 8 to 12 years for traditional tank models and 15 to 20 years for tankless models. However, a unit's actual lifespan can easily vary between 7 to 15+ years depending heavily on your local water hardness and routine maintenance.
How Age Determines If Water Heater Repair Is Worth It. Traditional tank water heaters last 8-12 years under normal conditions. Tankless units last 15-20 years but have higher repair costs when problems occur. Units over 10 years old with major problems should be replaced rather than repaired.
Ultimately, a leaking water heater is an emergency in certain instances, and prompt action is necessary to prevent any further damage or hazards. When you're facing such an issue in San Diego, CA, or one of the surrounding areas, Point Loma Electric and Plumbing offers expert San Diego water heater repair services.
Yes, you can absolutely still use cold water. Your home's cold water supply bypasses the heater entirely. However, you must immediately isolate the leaking tank to prevent flooding and further damage.