How Long Do Tankless Water Heaters Last?

As more North Carolina homeowners switch to energy-efficient systems, tankless water heaters have become increasingly popular. But before investing in one, you may be wondering: how long do tankless water heaters last? The answer depends on several factors, including maintenance, water quality, and installation. Understanding what affects the lifespan of your unit can help you make the most of your investment.

What Is the Lifespan of a Tankless Water Heater?

On average, a tankless water heater lasts 15 to 20 years. In comparison, traditional tank-style units typically last only 8 to 12 years. So if you’re asking how long do tankless water heaters last, the answer is that they can last nearly twice as long as conventional systems when properly maintained.

Gas-powered tankless units tend to be on the lower end of the lifespan range, while electric models may last longer due to fewer moving parts and less wear.

Factors That Affect How Long Tankless Water Heaters Last

Several key factors impact how long your tankless water heater will operate efficiently:

• Water quality: Hard water can cause scale buildup, reducing efficiency and shortening lifespan 
• Usage habits: High hot water demand may cause more wear and tear over time 
• Installation quality: Poor installation can lead to early system failures 
• Routine maintenance: Annual flushing and descaling help prevent mineral buildup and keep your system running smoothly 

So, when wondering how long do tankless water heaters last, remember that proactive care plays a major role.

Maintenance Tips to Extend the Life of Your Unit

To get the most out of your investment, follow these tips:

• Schedule annual professional maintenance, especially before winter 
• Install a water softener if you have hard water 
• Clean the system’s inlet screen filter regularly 
• Flush the unit once a year to remove scale and sediment buildup 
• Ensure proper ventilation for gas units 

With regular care, your tankless water heater could last beyond 20 years. It remains one of the most efficient and cost-effective choices for long-term home comfort.

When to Replace a Tankless Water Heater

Even with great care, your system will eventually need to be replaced. Signs it’s time include:

• Inconsistent water temperature 
• Noticeable drop in efficiency 
• Frequent need for repairs 
• Corrosion or visible damage 
• Age exceeding 15 to 20 years 

If you’re asking how long do tankless water heaters last and your current unit is nearing two decades, it may be time to schedule an inspection.

Get Expert Help from All About Plumbing & Septic

Still unsure how long your tankless water heater will last? The team at All About Plumbing & Septic can inspect your system, perform regular maintenance, or recommend a replacement when the time comes. We help homeowners throughout North Carolina get the most from their water heating systems all year long.

Call today to schedule service and keep your home prepared for every season.