Under sink water heaters, also known as point-of-use water heaters, are compact units that provide hot water directly at the sink or fixture where it’s needed. They are an efficient and affordable alternative to heating an entire home’s water supply with a central water heater. But how long can you expect an under sink water heater to last before needing replacement? There are several factors that influence the lifespan of under sink water heaters.
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Typical Lifespan
The typical lifespan of an under sink water heater is between 5-10 years. However, it’s not uncommon for high quality models to last 10-15 years or longer with proper maintenance and care.
Here are some general guidelines for expected lifespan:
| Type | Expected Lifespan |
|---|---|
| Basic models | 5-8 years |
| Mid-range models | 8-12 years |
| Premium/commercial models | 10-15+ years |
The basic, low-cost models typically last 5-8 years. Mid-range models in the $150-$300 range often last 8-12 years. And commercial grade or premium models designed for high use can last 10-15 years or longer.
Factors That Affect Lifespan
There are several variables that can impact how long your under sink water heater lasts:
Water Heater Type
The type of water heater makes a difference. Tankless water heaters tend to have a longer lifespan than tank models. They can last up to 20 years since there is no tank to corrode. Tank water heaters last 10-15 years on average.
Water Quality & Filtration
Hard water, sediment, rust and minerals take a toll over time. If you have hard water, installing a filter can help remove sediment and extend the heater’s lifespan. This helps prevent scale buildup and corrosion inside the tank or heating coils.
Frequency of Use
Frequent, heavy use will wear out a water heater faster than light, intermittent use. Commercial settings and large households that use a high volume of hot water each day will require more frequent water heater replacement compared to a single person household.
Maintenance & Care
Proper maintenance like annual flushing and anode rod replacement makes a big difference in lifespan, especially for tank models. Catching and addressing any leaks early also prevents extra damage. Following the manufacturer’s maintenance recommendations can help maximize lifespan.
Brand & Build Quality
Higher end models from reputable brands tend to last longer. Look for units with durable, corrosion-resistant materials. Commercial grade models made of stainless steel will have the greatest longevity. Cheap units made with substandard materials will have a shorter lifespan.
Installation Location & Conditions
Extreme temperatures, high humidity, hard water and sediment in the pipes all accelerate wear and tear. Heaters installed in unconditioned spaces like a garage or attic may break down faster. Proper ventilation and climate controlled installation location ideal.
How to Extend the Lifespan
With the right care and maintenance, you can maximize the lifespan of your under sink water heater:
Flush Annually
Flushing the tank and lines yearly removes built-up sediment and minerals. This simple maintenance improves performance and longevity.
Replace Anodes
Most tank water heaters have an anode rod that helps prevent corrosion by attracting it instead of the tank. Replacing this every 2-3 years extends the heater’s lifespan significantly.
Address Leaks Quickly
Even small leaks can allow minerals to build up and cause corrosion. Have any drips or leaks fixed right away to prevent damage.
Insulate Pipes
Insulating hot and cold water pipes reduces standby heat loss, putting less strain on the unit.
Install Water Treatment
Devices like water softeners and filters improve water quality and help remove sediment, chlorine and minerals that can degrade the heater over time.
Lower the Temperature
Very hot settings accelerate mineral buildup and corrosion. Set to no higher than 120°F to save wear and tear.
Clean Fixtures
Scale, rust and minerals at the faucet and fixtures can spread to the heater. Regular cleaning helps avoid this.
Hire a Professional
Have a qualified plumber handle any repairs or complex maintenance for best results.
When to Replace Your Water Heater
Here are some signs it’s time to replace your under sink water heater:
– Leaking or corroded tank
– Lack of hot water
– Faulty heating elements
-noisy operation
– Rust colored or cloudy water
– Failure to ignite
– Frequent shutdowns
– High energy bills
Many plumbers recommend replacing under sink water heaters around the 10 year mark, even if there are no obvious signs of failure. Preventative replacement can avoid being left without hot water at an inconvenient time in the future.
Cost to Replace an Under Sink Water Heater
The costs to replace an under sink water heater average $200-$600. This includes the cost of the new unit and professional installation. Here’s a breakdown:
| Expense | Cost |
|---|---|
| Under sink water heater | $100-$400 |
| Plumbing labor | $50-$150/hour |
| Miscellaneous parts & connections | $50-$100 |
| Total average cost | $200-$600 |
The specific costs depend on the type of water heater, features, brand, as well as your location. Tankless heaters are generally more expensive than tank models. Getting multiple quotes from local plumbers can help you find the best deal on parts, labor and services.
Conclusion
An under sink water heater typically lasts 5-10 years on average, with premium models lasting 10-15 years or longer. The lifespan is affected by the type of heater, water quality, use frequency, brand, proper maintenance and installation conditions. With periodic maintenance like flushing and anode rod replacement, you can maximize the lifespan of your under sink water heater. Watch for signs of leaks, faulty operation, rusty water and lack of hot water to know when it’s time to replace the unit. Replacement costs range from $200-$600 on average for the heater and professional installation. With proper care, your under sink water heater can provide reliable hot water for years to come.