How Long Do Tankless Water Heaters Last?

Written by Sophie Robertson, In Home Decor, Updated On

August 5th, 2024

, 499 Views

Tankless water heaters, also known as on-demand or instant water heaters, have gained popularity due to their efficiency and space-saving design. Unlike traditional tank water heaters, which store and continuously heat water, tankless models heat water directly as it flows through the unit. This process not only conserves energy but also provides a virtually endless supply of hot water. However, one critical consideration for homeowners is the lifespan of a tankless water heater. Understanding the factors that influence their longevity and how to maintain these systems can help you make an informed decision.

Average Lifespan of Tankless Water Heaters

On average, a tankless water heater can last between 15 to 20 years, and some high-quality models even extend up to 25 years with proper maintenance. This is significantly longer than traditional tank water heaters, which typically last about 10 to 15 years. Several factors contribute to the lifespan of a tankless water heater:

Quality of the Unit: Higher-end models from reputable manufacturers often use superior materials and technology, leading to a longer lifespan.

Water Quality: The quality of water in your area can impact the longevity of your water heater. Hard water, which contains high levels of minerals like calcium and magnesium, can cause scale buildup inside the unit, reducing its efficiency and lifespan.

Usage Patterns: The frequency and intensity of use affect the wear and tear on the unit. Households with higher hot water demand may experience a shorter lifespan compared to those with moderate use.

Regular Maintenance: Routine maintenance, such as descaling and cleaning, plays a crucial role in extending the life of a tankless water heater. Neglecting these tasks can lead to premature failure.

Factors Affecting the Lifespan of Tankless Water Heaters

Installation Quality: Proper installation by a certified professional ensures that the unit operates efficiently and safely. Incorrect installation can lead to operational issues and shorten the lifespan of the heater.

Water Hardness: Hard water is a common issue that affects water heaters. The minerals in hard water can accumulate inside the unit, leading to scale buildup. Over time, this buildup can reduce the efficiency of the heat exchanger and cause the unit to overheat, potentially leading to failure. Installing a water softener can mitigate this issue and extend the lifespan of your tankless water heater.

Maintenance Frequency: Regular maintenance, such as flushing the system to remove mineral deposits and inspecting the unit for any signs of wear or damage, is essential for longevity. Most manufacturers recommend annual maintenance, but this can vary depending on the hardness of your water and usage patterns.

Usage Intensity: The more frequently a tankless water heater is used, the more wear and tear it experiences. High-demand households, such as those with multiple bathrooms or large families, may see a reduced lifespan compared to smaller households with lower hot water needs.

Environmental Conditions: The environment in which the water heater is installed also plays a role in its lifespan. Units installed in areas with high humidity or corrosive environments may experience a shorter lifespan due to rust and corrosion.

Tips for Extending the Lifespan of Your Tankless Water Heater

Regular Descaling: For homes with hard water, regularly descaling the unit is crucial. This process involves flushing the water heater with a vinegar solution or a descaling agent to remove mineral deposits. Most manufacturers provide detailed instructions on how to perform this maintenance task.

Water Softener Installation: If you live in an area with hard water, consider installing a water softener. This device reduces the hardness of the water, preventing scale buildup inside the water heater and extending its lifespan.

Routine Inspections: Schedule annual inspections by a professional plumber to check for any potential issues, such as leaks, corrosion, or wear and tear on components. Early detection of problems can prevent costly repairs and extend the life of the unit.

Proper Ventilation: Ensure that the unit is installed in a well-ventilated area. Proper ventilation prevents overheating and reduces the risk of damage due to moisture buildup.

Use Manufacturer-Approved Parts: When replacing any parts, always use manufacturer-approved components. Using generic or incompatible parts can lead to malfunctions and reduce the lifespan of the unit.

Temperature Settings: Avoid setting the temperature too high. Excessive heat can increase wear and tear on the heat exchanger and other components. Most manufacturers recommend setting the temperature to 120 degrees Fahrenheit for optimal performance and longevity.

Comparing Tankless and Traditional Water Heaters

When deciding between a tankless and a traditional water heater, it’s essential to consider the lifespan and overall cost of ownership. Although tankless water heaters have a higher upfront cost, their extended lifespan and energy efficiency can lead to significant savings over time.

Energy Efficiency: Tankless water heaters are more energy-efficient because they heat water on demand, reducing standby energy losses associated with traditional tank heaters. This efficiency can lead to lower energy bills, offsetting the initial investment over the unit’s lifespan.

Space Savings: Tankless units are compact and can be installed in smaller spaces, making them ideal for homes with limited space. Traditional tank heaters require a larger footprint and may not be suitable for all home designs.

Hot Water Supply: Tankless water heaters provide a continuous supply of hot water, making them suitable for households with high hot water demand. Traditional tank heaters have a limited capacity, and once the hot water is depleted, it takes time to heat more water.