Why Is My Navien Tankless Water Heater Leaking Water?
Water leaking from a Navien tankless water heater should never be ignored. Even small leaks can cause water damage, corrosion, component failure, and unexpected system shutdowns.
Hot Water Pros provides professional Navien diagnostics and repair throughout Indianapolis and surrounding communities.
QUICK ANSWER
Why Your Navien Is Leaking
Most Navien leaks come from a failed O-ring or loose fitting, the condensate drain, or the pressure relief valve releasing water. A leak from the heat exchanger is more serious.
Top 3 causes
Failed O-rings or loose water connections
Condensate drain or trap problems
Relief valve discharge from high water pressure or expansion tank problems
When to call a pro
Running the unit while it leaks can damage the electronics, so schedule Navien tankless water heater repair soon. If the heat exchanger is leaking on an older unit, compare the repair with a new tankless water heater.
BEFORE YOU CALL
Safe Things To Check First
Stop the water: Close the cold-water supply valve to the heater.
Power: If water is near the unit's electrical parts, switch off the heater's breaker, as long as you aren't standing in water.
Contain it: Use towels or a bucket and move anything that could get damaged.
Find the source: Note or photograph where it's coming from: the bottom of the unit, the condensate line, the relief valve pipe or a connection.
Leave it to a pro: opening the unit, replacing O-rings or tightening internal fittings.
Also seeing error 351? Read our Navien error code 351 guide. Need help now? Call 317-922-9043 or book online.
Common Causes Of Navien Water Leaks
Several issues can cause a Navien tankless water heater to leak:
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Failed O-rings
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Loose fittings
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Heat exchanger leaks
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Condensate drain problems
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Condensate trap issues
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Pressure relief valve discharge
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Excessive water pressure
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Expansion tank problems
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Freeze damage
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Internal component failure
Where Is The Water Coming From?
Identifying the leak location can help narrow down the cause.
Common leak locations include:
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Bottom of the unit
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Condensate drain connection
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Water supply connections
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Relief valve piping
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Internal heat exchanger
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Recirculation components
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Isolation valves
Not all leaks indicate a major repair. Some are relatively simple to correct when caught early.
Can I Continue Using My Navien If It's Leaking?
In many cases, continued operation is not recommended.
Water leaks may:
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Damage electronics
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Cause corrosion
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Trigger error codes
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Create safety concerns
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Lead to more expensive repairs
If a leak is present, the system should be inspected as soon as possible.
Signs You Need Professional Navien Repair
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Visible water around the unit
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Dripping from the bottom of the heater
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Rust or corrosion
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Water stains on nearby surfaces
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Repeated pressure relief valve discharge
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Error codes after leaking begins
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Sudden loss of hot water
Repeated Shutdowns Usually Mean The Underlying Problem Has Not Been Fixed
Many homeowners temporarily restore hot water by resetting their Navien, only to experience the same shutdown again days later. Repeated shutdowns often indicate ignition, venting, pressure, or maintenance-related problems that require proper diagnosis.
Hot Water Pros can identify the root cause and help prevent future interruptions.
Call Today: 317-922-9043
Why Indianapolis Homeowners Choose Hot Water Pros
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Licensed Indiana plumbing contractor
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Experienced with Navien tankless systems
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Same-day service available
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Water pressure diagnostics
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Tankless flushing and maintenance
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Upfront pricing
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Serving Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, and Zionsville
We Repair All Major Navien Models
Our technicians service all major Navien tankless water heater models including:
• Navien NPE-240A2
• Navien NPE-210A2
• Navien NPE-180A2
• Navien NPE-S2 Series
• Navien NCB Series
• Navien NHB Series
Navien NPE-240A2
199,000 BTU
Navien NPE-210S2
180,000 BTU
Navien NPE-240S2
199,000 BTU
Navien NPE-180A2
150,000 BTU
Navien Tankless Leaking Water FAQs
Why is my Navien leaking water?
Leaks can be caused by fittings, condensate issues, pressure problems, heat exchanger failures, or worn components.
Is a leaking Navien dangerous?
While not always dangerous, leaks can damage electronics and surrounding property if ignored.
Can high water pressure cause a Navien leak?
Yes. Excessive pressure can contribute to relief valve discharge and component stress.
Does a leaking heat exchanger require replacement?
In some cases, yes. A professional diagnosis is necessary to determine the best repair option.
How much does it cost to fix a leaking Navien?
Repair costs depend on the cause. We provide upfront pricing before any work begins, and warranty coverage is available on qualifying repairs.
Do you repair leaking Navien water heaters in Indianapolis?
Yes. Hot Water Pros provides diagnosis and repair for leaking Navien tankless water heaters throughout Indianapolis and surrounding communities, with same-day service available. Call or text 317-922-9043 to schedule.
Locally Owned & Operated
Hot Water Pros proudly provides Navien repair throughout Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, Cicero, and Zionsville. Our Navien trained technicians can quickly diagnose tankless water heaters and restore reliable hot water to your home.
TANKLESS WATER HEATER SERVICES
WE INSTALL. WE SERVICE. WE GUARANTEE.
From installation to maintenance and repairs, we handle all your tankless water heater needs with honest pricing, expert workmanship, and the best brands in the industry.
Professional installation of tankless water heaters for maximum performance and efficiency.
Professional replacement of tankless water heaters for maximum performance and efficiency.
Fast diagnostics and expert repairs to keep your tankless water heater running like new.
Extend the life of your unit and maintain peak performance with professional tankless flushing and cleaning.
CUSTOMER REVIEWS
What Our Customers Say
“They are extremely professional experts who show up same / next day and provide top quality services.”
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