Optimizing Performance: Tankless Water Heater Maintenance Solutions

Efficient Maintenance Services

Licensed & Insured

5-Star Rated

Same-Day Available

All Brands Serviced

Expert Diagnostics

Important Maintenance Checks For Better Performance

Regular maintenance covers several important areas that can affect how a tankless water heater performs.

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Water Flow

Proper flow helps the heater deliver hot water consistently.

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Temperature Check

Testing helps confirm that the system is heating properly.

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System Cleaning

Routine cleaning helps remove buildup that may affect performance.

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Component Inspection

Key operating parts are checked for possible concerns.

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Early Problem Detection

Small issues can be noticed before they become more disruptive.

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Steady Hot Water

Maintenance helps support dependable hot water throughout the home.

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Routine Care

Regular service keeps maintenance needs from being overlooked.

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Performance Review

The system can be checked to see if it is operating as expected.

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Long-Term Care

Consistent maintenance can help support the heater's useful service life.

Our Proven Process

Keeping Your Tankless System Running Perfectly

Unlike traditional tanks, tankless water heaters require minimal but important maintenance. With proper care, your system will deliver peak performance on average of 25-30+ years.

Annual Maintenance Checklist

  • Flush and descale the heat exchanger (removes mineral buildup)
  • Inspect and clean the inlet filter screen
  • Check venting and combustion air supply
  • Test pressure relief valve
  • Inspect gas connections for leaks
  • Check error codes and run diagnostic cycle

Recommended

Our Maintenance Plans

Tankless Pro Care Plan

Let us handle it for you. Our annual maintenance visits keep your system under warranty, running efficiently, and free from costly breakdowns.

  • Annual descaling & flush
  • Full system inspection
  • Priority scheduling
  • Discounted repair rates
  • Reminder service

5 Steps Observed During Tankless Water Heater Maintenance

Regular maintenance helps keep a tankless water heater operating reliably, supports consistent hot water, helps identify small problems before they become major repairs, and can extend the system's useful service life.

System Inspection

The unit is checked for unusual sounds, leaks, error codes, and visible signs of wear to identify concerns early.

Water Flow Check

Water flow and temperature performance are tested to make sure the heater is delivering hot water properly.

Internal Cleaning

The system is cleaned as needed to help remove buildup that can affect heating performance and water flow.

Component Testing


Important operating components are checked to confirm that the system is functioning as expected.

Final Performance Test

The heater is operated and monitored after maintenance to verify consistent temperature and overall operation.

Expert Repair Solutions

Root Causes & How We Fix Them

Click any item below to see the likely symptom, repair action, and part replaced.

  • Faulty Igniter / Ignition Module

    Likely Symptom: Unit won't ignite — clicks but no flame  

    Repair Action: Replace igniter electrode or ignition module  

    Typical Part Replaced: Ignition assembly  

  • Failed Flow Sensor

    Likely Symptom: No hot water — unit won't activate when taps are opened   

    Repair Action: Clean or replace the flow sensor   

    Typical Part Replaced: Flow sensor / turbine  

  • Clogged Heat Exchanger

    Likely Symptom: Error codes displayed, reduced heat output  

    Repair Action: Chemical flush and descale the heat exchanger   

    Typical Part Replaced: Heat exchanger (if cracked or corroded)  

  • Blocked or Improper Venting

    Likely Symptom: Unit shuts off mid-use or throws combustion errors   

    Repair Action: Clear obstructions and re-route vent if needed  

    Typical Part Replaced: Vent pipe fittings  

  • Gas Valve Failure

    Likely Symptom: No ignition, possible gas smell near unit   

    Repair Action: Replace the gas valve assembly  

    Typical Part Replaced: Gas valve assembly  

  • Temperature Sensor Failure

    Likely Symptom: Inconsistent water temperature — hot-cold swings  

    Repair Action: Replace the thermistor  

    Typical Part Replaced: Thermistor / temperature sensor  

  • Printed Circuit Board (PCB) Failure

    Likely Symptom: Error codes, no power, or erratic behavior  

    Repair Action: Reprogram or replace the control board  

    Typical Part Replaced: PCB / control board  

  • Pressure Relief Valve Leak

    Likely Symptom: Water dripping from the relief valve discharge pipe  

    Repair Action: Replace the pressure relief valve  

    Typical Part Replaced: T&P relief valve  

Certified Brand Expertise

We Repair All Major Brands

Our technicians are trained on the specific quirks and error codes of every major manufacturer.

Rinnai

Common Error Codes: Code 11 (ignition failure), Code 12 (flame loss), Code 25 (water temp too high)

Known For: Excellent reliability but scale-prone heat exchangers in hard-water areas like Knox County.

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Rinnai requires OEM parts for warranty compliance.

Don't wait for a cold shower.

Our Knoxville technicians are ready today.

(865) 407-1147

Trusted Local Service

Why Knoxville Trusts Tankless Heater Pros

We've built our reputation on honest work and reliable service — every call, every time.

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Same-Day Service

We dispatch technicians across Knox County daily — often within hours of your call.

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All Brands & Models

Gas, propane, and electric tankless units. If it heats water, we fix it.

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Upfront Pricing

No surprises. We quote before we wrench, so you know the cost before we start.

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Licensed & Insured

TN-licensed plumbers with full liability coverage on every job.

Proudly Serving Our Community

Serving Knoxville & Surrounding Communities

We've built our reputation on honest work and reliable service — every call, every time.

Tankless Heater Pros proudly serves homeowners and businesses throughout Knox County and the surrounding East Tennessee communities. Whether you're in downtown Knoxville, the suburbs of Farragut, or across the county line in Maryville or Oak Ridge, our technicians are just a phone call away at (865) 407-1147

We understand the unique plumbing challenges of our region — from hard water mineral deposits common throughout the Tennessee Valley to the specific building codes and venting requirements in Knox County. That local expertise means faster, more accurate repairs for your tankless water heater.

Call (865) 407-1147 to confirm service in your area

Knoxville

Farragut

Hardin Valley

Karns

Cedar Bluff

Oak Ridge

Clinton

Lenoir City

Kingston

West Hills

Bearden

Sequoyah Hills

Northshore

Concord

West Knoxville

Maryville

Alcoa

Tellico Village