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.
Signs a Water Heater is Going Bad
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.
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.
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.
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.
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.
How to Test a Water Heater Heating Element
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.
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.
If the cost of repairs exceeds 50% of the cost of buying a new water heater, replacement is likely the smarter decision, especially if your water heater is older. Older or less efficient models may result in higher utility bills. Upgrading to a newer, more energy-efficient unit can save you money over time.
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.
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 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.
If a standard showerhead is fitted, it will use around an extra half a gallon each minute, accounting for a 25-gallon emittance every 10 minutes, or 50 gallons throughout a 20-minute shower. *1 gallon = 4.54 litres.
Yes, you can absolutely flush a water heater yourself as a beginner DIY project. It is a recommended annual maintenance task that takes under two hours to remove sediment buildup, which improves efficiency and extends the life of your heater. The process involves shutting off power/gas, shutting off the cold water supply, draining the tank with a garden hose, and flushing out sediment.
A leaky water heater doesn't have to stop you from running water as long as you're OK with a cold shower—and have already scheduled a plumber to resolve the leak. But, if you run too much water or wait too long to get a repair, you could end up with some pretty costly (and sometimes even dangerous) damage to deal with.
A hot water heater's lifespan typically falls between 8 and 12 years for traditional tank systems, and 15 to 20+ years for tankless models. However, your unit's actual longevity largely depends on its maintenance, your daily usage, and your local water quality.
Resetting a water heater safely involves turning off the power, accessing the unit's control panel, and pushing the red safety reset button (usually located near the upper thermostat).
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.