A working water heater is one of those household essentials most people don’t think about—until the hot water disappears. Whether you’re buying a new home, considering an upgrade, or just trying to plan ahead, one of the most common questions people wonder is ‘How long does a water heater last?’ Its lifespan depends on the unit type, how well it’s maintained, and the quality of the water running through it. Let’s break it down.
The Average Lifespan of a Water Heater
The lifespan of a water heater varies based on whether it’s a traditional tank system or a newer tankless model.
Tank Water Heaters
Most conventional tank water heaters last 8 to 12 years. These systems heat and store water in a tank, making them more prone to sediment buildup and corrosion over time.
Tankless Water Heaters
Tankless units heat water on demand and can last 15 to 20 years, sometimes even longer with regular maintenance. Because tankless water heaters don’t store hot water, there’s less wear on the internal components.
Of course, these are averages. A water heater that’s been regularly maintained and installed properly may exceed expectations, while one that’s neglected or dealing with hard water issues may fail early.
What Affects a Water Heater’s Lifespan?
Several factors play a role in how long your water heater will keep running:
1. Water Quality
If your home has hard water—water that contains high levels of minerals like calcium and magnesium—those minerals can collect inside your tank and reduce its efficiency. Over time, they settle at the bottom and form a hard, crusty layer that forces the water heater to work harder.
2. Usage Patterns
The more hot water your household uses, the harder your water heater has to work. A large family using multiple showers, dishwashers, and washing machines daily will put more strain on the system than a smaller household.
3. Maintenance
Just like a car, regular check-ups go a long way. Flushing the tank once a year, checking the anode rod, and inspecting valves and connections can extend the life of your heater. Tankless models benefit from annual descaling, especially in areas with hard water.
4. Installation Quality
A poorly installed water heater may not perform efficiently and could wear out faster. It’s important to use licensed professionals who understand code requirements and proper safety procedures.
Signs Your Water Heater May Be Near the End
How can you tell if your water heater is nearing the end of its life? Look out for these red flags:
- Inconsistent hot water – Hot water runs out quickly or turns cold unexpectedly.
- Strange noises – Popping or rumbling sounds can mean sediment buildup inside the tank.
- Rusty water – Corroded tanks can cause discoloration in your water.
- Leaks or moisture – Water pooling around the unit usually means internal failure.
- Age – If your unit is 10+ years old and showing any of the signs above, it’s probably time to consider a replacement.
When to Replace vs. Repair
If your water heater is relatively new and experiencing issues, a repair might do the trick. Replacing a heating element, thermostat, or valve can be a cost-effective fix. But if the unit is over a decade old and frequently acting up, replacement is often more cost-effective in the long run. Newer models are also more energy-efficient, which can save you money on utility bills.
Speak to a Water Heater Expert
Whether you’re trying to decide if it’s time for a new water heater or you just want a professional opinion, Big B’s Plumbing, Electric, Heating & Air is here to help. Our licensed and experienced plumbers can assess your current unit, perform repairs, or install a brand-new, energy-efficient water heater model.
Don’t get left with cold water. Call Big B’s today to schedule service or request an installation estimate.
