A water heater generally needs to be replaced if it is leaking from the inner tank, producing rust-colored water, making loud rumbling noises, or constantly failing to produce hot water. Most traditional tank systems last 8 to 12 years, while tankless models can last 15 to 20 years.
Traditional tank water heaters last 8 to 12 years, while tankless models typically last 15 to 20 years. Lifespans vary greatly depending on water quality, unit design, and whether you perform regular maintenance like flushing the tank and checking the anode rod.
Signs a Water Heater is Going Bad
A: Traditional tank water heaters usually last 8–12 years, while tankless units often last 15–20+ years. Q: Should I replace my water heater if it's over 10 years old? A: Often yes. Even if it still works, the risk of leaks and sudden failure increases significantly after 10 years.
If hot water runs out too soon, maybe the heater's too small, or it's slow to reheat, or there's buildup inside. You might notice water getting colder faster, or weaker pressure. There are ways to keep your supply steady, but let's look at some common questions.
The bottom line
A water heater that runs nonstop is a warning. Fix small issues early and you avoid high bills, cold showers, and surprise leaks. If your system is old or unreliable, consider a modern replacement or a tankless upgrade.
A 40-gallon water heater typically provides 8 to 15 minutes of continuous hot water for a shower. The exact duration depends on the factors outlined below.
The most reliable water heaters depend on the type of unit you need. For traditional tank water heaters, plumbers and industry experts consistently rank A.O. Smith, Bradford White, and Rheem as the most dependable brands. For tankless systems, Navien and Rinnai are the top-rated choices.
Here are some estimated labor cost price ranges for a water heater replacement: Tank-style water heater: $150 to $450. Tankless water heater: $600 to $1,900. Switching from tank-style to tankless: $150 to $2,500.
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.
If you are looking to properly decommission, drain, or dismantle an old water heater for replacement, the process involves safely shutting off the power and water, completely draining the tank, and carefully disconnecting the plumbing.
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.
Most manufacturers and plumbing experts recommend flushing your water heater once a year to prevent sediment and mineral buildup, which helps maintain energy efficiency and extends the lifespan of the tank.
Excessive Water Pressure: High pressure stresses your system and shortens its lifespan. A pressure-reducing valve can help. Undersized System: A unit that's too small for your household's demand works harder and wears out faster. Proper sizing during installation is critical.
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.
The Home Depot offers traditional water heater tanks and modern tankless units, both powered by either gas or electricity. Depending on your selection, the average cost for standard tank installation is generally between $1,600 to $2,400. Tankless installation can range from $2,400 to $5,400.
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.
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.
While the DOE isn't banning gas water heaters entirely, the new energy efficiency standards effectively phase out many conventional models. Gas-powered units will effectively need to use condensing technology to meet the 2026 requirements—a feature that adds cost and complexity for manufacturers and installers.
Some of the most reliable tank water heater brands in 2026 include Rheem, A.O. Smith, and Bradford White. These manufacturers have long histories of producing durable, efficient heaters with strong warranty coverage. Rheem is known for overall dependability and wide availability, A.O.
Tank to Tank Installation: On average, replacing a gas or electric water tank with a similar model takes two to three hours. It takes between 45 to 60 minutes to drain, disconnect and remove your old water heater.
We recommend going with Rheem, specifically for the Professional Series with 8 Year Warranty.
There isn't a single "number 1" model, as the ideal water heater depends on your home's setup, but top-rated brands dominating the market include Rheem (best overall tank/tankless) and A.O. Smith (best for durability and commercial-grade units).
Bradford White water heaters are widely regarded as some of the most durable on the market. They come with an array of well-thought-out features that enable them to stand up to all kinds of wear and tear that results from regular use. Overall, they have a longer service life than Rheem water heaters.