What does a tankless water heater repair cost?

Repair costs vary by the failed component. We provide a flat-rate estimate after diagnosis. Common repairs range from cleaning inlet filters to ignition module replacement to heat exchanger work. Call for a quote on your specific situation.

Is it worth repairing a 15-year-old tankless water heater?

Usually yes, if the repair cost is less than 40% of a new unit's cost. A 15-year-old system with a single failed component is often worth repairing. If the heat exchanger is corroded or multiple repairs are needed in a short time, replacement may be wiser. We assess and advise honestly.

Will descaling prevent future mineral buildup?

Descaling removes current buildup but doesn't prevent new buildup in hard water. In Central Florida's hard-water areas, descaling is often needed every 2–3 years. A whole-home water softener eliminates the problem permanently and improves the lifespan of your tankless heater.

What's that error code on my display?

Error codes vary by brand but usually point to specific failures: ignition fault, temperature sensor failure, flow rate problem, or overheat condition. Call us with the code and your unit's brand/model and we can tell you what it means and how urgent the repair is.

How often should a tankless water heater be serviced?

In our region, annual maintenance is ideal for systems over 5 years old. We flush the heat exchanger, test sensors and valves, and check for corrosion. Hard-water areas like most of Central Florida should flush annually to prevent scaling.

Expert repairs for Navien, Rinnai, and Rheem systems

Tankless Water Heater Repair in Kissimmee & Central Florida

Name: Plumbing Solutions of Central Florida, Inc.
Address: 3501 W Vine St Ste 277, Kissimmee, FL, 34741, US
Telephone: (407) 847-0884
Price range: 77946

When a tankless water heater fails, it often happens at the worst time — a cold shower in the morning or a backed-up inspection before a sale. Plumbing Solutions of Central Florida has been diagnosing and repairing tankless systems for years. We understand the unique challenges of on-demand heating: mineral scaling inside heat exchangers, ignition failures, gas valve issues, and venting problems that central Florida's humidity can accelerate. Our technicians arrive with parts for the most common failure points, multimeters to check gas pressure and electrical circuits, and the expertise to avoid unnecessary replacement. We serve homeowners throughout Kissimmee, Orlando, Longwood, Celebration, and surrounding areas with same-day service availability.

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Recognized by the Better Business Bureau for our commitment to quality and customer satisfaction.

Licensed & Insured

Licensed plumbing contractors with comprehensive coverage for your peace of mind.

30+ Years Experience

Over three decades of trusted service in Central Florida with thousands of satisfied customers.

Warranty Protection

All work backed by our comprehensive warranty. We stand behind our craftsmanship 100%.

24/7 Emergency Service

Plumbing emergencies don’t wait. Neither do we. Call us anytime for emergency repairs.

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Plumbing Solutions of Central Florida, Inc. service truck

Why Choose Plumbing Solutions

Why Choose Plumbing Solutions for Tankless Water Heater Repair

Expert diagnosis, same-day parts availability, and transparent pricing for all tankless water heater repairs.

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Real-time Diagnosis Saves Money

Tankless systems are complex—mineral deposits, ignition modules, and heat exchanger leaks all require different fixes. We don't guess. We test water pressure, inspect flame quality, read error codes, and document the fault so you know exactly why the repair happened. That diagnosis keeps you from replacing a 15-year-old system when a heat exchanger flush or new mixing valve will restore it for a fraction of the cost of replacement.

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Same-day Parts Availability

Most repair shops order components and leave you without hot water for days. We stock thermistors, gas valves, ignition assemblies, and pressure relief valves for Navien, Rinnai, and Rheem models in our service van. If the part exists locally, we install it the same day you call. For specialty components, we know the dealer networks and can often expedite overnight.

Same-Day Service

Veteran-led Team

Our lead technicians have worked on residential and commercial systems side by side, which means we bring commercial-grade diagnostic discipline to every home repair. We use pressure gauges, combustion analyzers, and digital multimeters—tools most plumbers save for bigger jobs—because the root cause of a tankless failure is always technical, never a mystery.

Expert Service

No Pressure to Replace

A 12-year-old tankless water heater with a failed mixing valve is still a 12-year-old system. We repair when repair makes sense and explain the trade-offs honestly. A single failed component repair may extend the system's life cost-effectively; multiple failures or heat exchanger corrosion may point toward replacement. If replacement is the better path, we'll walk you through financing options.

Honest Assessment

Central Florida Expertise

Tankless systems in our region face unique stressors: mineral buildup from our water chemistry, salt-air corrosion near Miami, and the thermal shock of heating gulf water in summer. We've seen what breaks first and where preventive maintenance saves the most money. Our repair calls often end with a maintenance recommendation that prevents the same failure five years from now.

Local Expertise

Transparent Pricing & Warranty

We price flat-rate repairs where possible so there's no surprise bill. Every repair includes a one-year parts warranty and documentation so your system's history is clear. If a repaired component fails again during that period, we cover the labor to replace it.

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Get Your Hot Water Back Fast

Our technicians are ready to diagnose your system and get you back to hot water fast. Use our online form to book a service appointment or call directly.

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Warning Signs

Signs Your Tankless System Needs Repair

Don't ignore these warning signs — early diagnosis prevents costly emergency repairs.

No Hot Water or Inconsistent Temperature

When a tankless heater stops producing hot water or delivers only lukewarm water, the culprit is usually an ignition module that won't fire, a gas valve stuck partially closed, or mineral scale blocking the heat exchanger. On-demand systems have no tank to buffer temperature swings, so any drop in heating power is immediately felt. We test ignition spark, gas pressure, and water flow rate to pinpoint the failure. Rinnai and Navien systems often throw error codes that tell us the exact stage where heating fails—something a homeowner might miss but a technician can read and repair in minutes.

Error Codes or Blinking Lights

Your tankless heater is showing error codes (like a Navien "011" or Rinnai "10" code) or the LED is blinking abnormally. These codes are your system's way of telling you exactly what went wrong. An "011" on Navien means ignition failure; a "10" on Rinnai points to a flame-out or water flow issue. We carry the diagnostic manuals and parts for these common faults. Ignoring error codes often means a temporary reset gets you through the week, but the real failure (a corroded electrode, a weak flame rod) worsens. We find the root cause and replace the component so you're not resetting your heater every few days.

Low Water Pressure or No Flow

If you notice weak water pressure from hot taps but cold taps flow normally, a tankless system's flow sensor might be misreading. Heat exchangers can also clog with mineral deposits—especially in areas with hard water—so flow slows, the system thinks it's a cold-water line, and heating shuts down. We flush the heat exchanger, replace clogged screens, and sometimes install a water softener to prevent it from happening again.

Leaks Around the Unit or Connections

Water dripping from the tankless heater itself is different from a leaking connection joint. If the leak is at the body of the unit, the heat exchanger may have developed a micro-fracture, or a relief valve may be lifting pressure continuously. Small leaks often get worse fast; we diagnose whether a seal, a valve, or the heat exchanger itself is failing. Catching a leak early means you might replace one part and keep the system running. Waiting means water damage spreads.

Strange Odors, Soot, or Black Marks

Incomplete combustion creates soot deposits or unusual smells near the venting. This is a safety signal. Blocked vents, incorrect gas pressure, or a failing burner assembly prevent full combustion. We inspect venting for blockages (spider webs, dead insects, and lint clog vents surprisingly often), test gas pressure with a manometer, and check for the telltale blue-flame color that means clean combustion. Soot means the system is running inefficiently and could be starving for air—a serious problem in sealed mechanical rooms.

Age Over 15 Years With Frequent Repairs

If your tankless water heater is past 15 years old and you're calling for repairs twice a year, the system is entering decline. Components wear out, mineral buildup becomes chronic, and parts get harder to source. We can often squeeze another few years out of an aging system with targeted repairs and maintenance, but if repair bills add up to 40–50% of a new unit's cost, replacement becomes the smarter investment. We'll be honest about this trade-off.

Our Process

Our Tankless Water Heater Repair Process

Five clear steps from diagnosis to documentation — no guesswork, no surprises.

Comprehensive System Diagnosis

We start every repair by interviewing you: When did the problem start? Did you notice error codes, water temperature swings, or an unusual sound? We then inspect the entire system—gas connections, water lines, venting, and the heater's exterior for leaks or corrosion. We take photographs of any visible damage or deposits. Only after visual inspection do we power the unit on to observe behavior. This approach prevents us from missing secondary issues (like a water softener that's failing and starving the heat exchanger of flow) that could repeat the problem post-repair.

Document error codes and reset procedures for your brand
Check gas pressure with a manometer
Verify water inlet flow and measure output temperature
Inspect the vent termination outside for debris

Initial Inspection Checklist

Visual assessment of gas connections
Water line inspection for leaks
Venting system examination
Error code documentation
Photographic evidence collection
System behavior observation

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Testing and Root Cause Identification

Once we see the problem, we narrow it down to the specific failed component. A no-hot-water symptom could mean five different things; testing determines which one.

Ignition tests with a spark tester or multimeter check if the gas ignition module is firing
Flame rod inspection on pilot lights confirms the rod senses flame
Gas valve testing uses pressure gauges and electrical measurement
Heat exchanger inspection includes mineral scale observation
Water flow sensor testing checks that the sensor correctly detects hot-water demand
Mixing valve function is tested to ensure temperature regulation

Testing takes 30–45 minutes for complex cases but gives us 100% certainty about what's broken.

Diagnostic Tools We Use

Spark tester and multimeter for ignition
Pressure gauges for gas valve testing
Combustion analyzer for efficiency
Flow meters for water sensor testing
Temperature probes for heat exchanger
Manometer for gas pressure verification

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Repair or Part Replacement

Once we know the root cause, we explain the repair to you with the cost and the time required. Most repairs finish same-day.

Scaling issues often resolve with a professional flush using a descaling kit
Ignition module replacement takes about an hour and solves chronic no-start issues
Mixing valve replacement restores temperature stability
Relief valve replacement stops nuisance leaking
Vent or water line repair addresses leaks or blockages

We use OEM (original equipment manufacturer) parts whenever possible—they carry warranties and fit exactly—but we'll discuss equivalent aftermarket alternatives if they're available and cost-effective.

Common Same-Day Repairs

Ignition module replacement
Heat exchanger descaling
Mixing valve replacement
Gas valve repair or replacement
Flow sensor cleaning
Pressure relief valve replacement

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Post-Repair Testing and Verification

After the repair, we flush the system, restore pressure and gas flow, ignite the burner, and verify that hot water reaches your taps within 3–5 seconds. We check for new leaks, listen for unusual sounds, and confirm that error codes have cleared. We run the system through a heating cycle so you see it working and feel confident about the repair.

Measure output temperature at the tap
Run cold water for 30 seconds, then hot water
Document the final state with photos or video

Our Testing Protocol

System flush and pressure restoration
Burner ignition verification
Hot water delivery timing test
Leak inspection at all connections
Error code clearance confirmation
Full heating cycle demonstration

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Documentation, Warranty, and Maintenance

We provide a full invoice showing what was replaced, the labor time, and the warranty (typically one year on parts). We photograph the repaired system and email you a copy. We also recommend a maintenance schedule so the system doesn't fail again at a critical moment.

For systems with mineral buildup, we recommend annual descaling
For aging units, we may suggest a maintenance plan
We sometimes recommend a water softener installation

Most customers appreciate having this record in case they sell the home or need to refer back to what was fixed.

What You Receive After Every Job

Written summary of work performed
Materials and parts documentation
One-year parts warranty information
Preventive maintenance recommendations
Photographic evidence of repair
Optional maintenance plan enrollment

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Why Choose Plumbing Solutions?

Experienced Plumbers

Our team of licensed and experienced plumbers is well-equipped to handle any plumbing challenge.

Efficient Water Heating

Upgrade to energy-efficient water heating solutions that save you money and provide consistent hot water.

Gas Fire Pit Specialists

We bring warmth and ambiance to your outdoor space with custom gas fire pit installations.

Prompt Service

Plumbing Solutions understands the urgency of plumbing issues and responds quickly to your service calls.

Transparent Pricing

Financing available for qualified applicants We provide upfront pricing and believe in fair, honest, and transparent dealings with our customers.

Brands We Service

Trusted Brands, Expert Installation

Tankless Water Heater Questions Answered

Frequently Asked Questions About Tankless Water Heater Repair

Most repairs take 1–3 hours depending on the fault. Cleaning a clogged inlet screen takes 30 minutes; replacing an ignition module takes about an hour; descaling a heat exchanger takes 2 hours. Complex repairs involving venting or gas line work may take longer. We estimate the time when we arrive and assess the problem.

Yes. We service all three brands regularly and carry common replacement parts for each. We also repair A.O. Smith, EcoSmart, and Stiebel Eltron units. If you have a different brand, call us with the model number and we can confirm we can service it.

Repair costs vary based on the failed component and complexity of the repair. Simpler repairs (filter cleaning, valve replacement) cost less; heat exchanger or gas valve work costs more. We give you a flat-rate estimate after diagnosis and explain the parts, labor, and warranty before we proceed. No surprise bills.

Usually yes, if the repair cost is less than 40% of a new unit's cost. A 15-year-old system with a single failed component (ignition module, mixing valve, pressure relief valve) is often worth repairing. If the heat exchanger is corroded or multiple repairs are needed in a short time, replacement may be wiser. We'll be honest about which path saves you money.

Descaling removes current buildup but doesn't prevent new buildup if your water is hard. If you're in an area with hard water (common in Central Florida), descaling is often needed every 2–3 years, especially if your system runs frequently. A whole-home water softener eliminates the problem permanently and improves the lifespan of your tankless heater, washing machines, and dishwasher.

Minor tasks like cleaning an inlet screen are homeowner-friendly. Anything involving ignition, gas pressure, venting, or electrical work should be left to a licensed plumber. Tankless systems operate under high pressure and gas—misdiagnosis or improper repair can cause safety hazards like gas leaks or carbon monoxide.

Error codes vary by brand but usually point to a specific failure: ignition fault, temperature sensor failure, flow rate problem, or overheat condition. Don't ignore them. Call us with the code and your unit's brand/model and we can tell you what it means and whether it's urgent. Some codes mean you need service within days; others can wait a week or two.

In our region, annual maintenance is ideal for systems over 5 years old. We flush the heat exchanger, test all sensors and valves, and look for corrosion. Systems under 5 years old in soft-water areas might stretch to every 2 years. Hard-water areas (most of Central Florida) should flush annually to prevent scaling.

Yes. We have technicians available for same-day and evening service. Call (407) 847-0884 and let us know your situation. Weekend and after-hours repair may incur an additional service fee.

We provide a one-year parts warranty on all replacements and 30-day labor warranty. If a repaired component fails within one year, we cover the parts and labor to replace it. If an issue is related to the original repair but stems from a different component, we'll diagnose it at no charge and discuss the next steps.

Where We Work

Service Areas for Tankless Water Heater Repair

We serve homeowners and businesses throughout Central Florida. If you're in one of these areas, we're likely your closest expert.

Longwood, FL

Quick response times from our Kissimmee base; we handle both residential homes and small commercial applications in the Wekiwa Springs area.

Celebration, FL

We regularly repair tankless systems in planned communities where precision maintenance is expected; same-day service available.

Miami, FL

Extended service area; our technicians are familiar with corrosion challenges in coastal properties and high-pressure municipal water systems.

Winter Park, FL

Historic homes and newer estates alike; we've serviced both older retrofit installations and new construction tankless systems.

Orlando, FL

Our primary service hub; we offer same-day and next-day appointments for most repair calls in the greater Orlando metro.

Groveland, FL

West-county service with same reliability and response time as our central locations.

Poinciana, FL

We handle the unique hard-water challenges in this fast-growing area; descaling and maintenance plans are popular here.

Lakeland, FL

South-county coverage; we're familiar with Polk County's water characteristics and local code requirements.

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Reduce the mineral buildup that stresses tankless systems. We install whole-home softeners and filters in Kissimmee and surrounding areas.

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What Central Florida Says About Us

Real reviews from homeowners and businesses we've served across Kissimmee, Orlando, St. Cloud, and beyond.

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