Full Diagnostic
Thermal camera scan, manifold pressure gauge reading, flow meter check, and error code pull. We identify whether the exchanger is scaled, cracked, or clogged before quoting.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
Workmanship Guaranteed in Dallas
What Heat Exchanger Repair Includes
Every tankless water heater heat exchanger repair Dallas TX job includes the diagnostic, the repair or replacement, and a full system test before we leave. Add-ons like isolation valves, a water filter, or a softener tie-in are quoted separately and only if you approve.
Descaling Service
Flush kit and descaling pump circulate food-grade solution through the exchanger for 45 to 90 minutes. This strips calcium and restores flow on cores that are still intact.
Exchanger Replacement
When repair is not viable, we install an OEM exchanger for your Rinnai, Navien, Noritz, Takagi, Bosch, Rheem, or A.O. Smith unit, with new gaskets and Teflon tape on every joint.
Pressure and Leak Test
We pressurize the system to 80 psi, check every fitting with a thermal camera, and confirm no weeping at the exchanger, pressure relief valve, or gas flex connector.
Burner and Vent Check
A combustion analyzer verifies clean burn and proper venting. Soot or blocked venting kills new exchangers fast, so we correct it before we close up the unit.
Warranty Registration
We register the part warranty with the manufacturer and hand you the paperwork. Coverage runs 1 to 5 years depending on brand and part.
Tankless Water Heater Heat Exchanger Repair Dallas TX Explained
Tankless water heater heat exchanger repair Dallas TX is the specialized service that restores the copper or stainless steel core where your unit transfers burner heat into your domestic water. When that core scales up, cracks, or clogs, you lose hot water, pressure drops, and error codes start flashing. We pull the unit, inspect the exchanger with a thermal camera, run a descaling pump with food-grade solution, and either repair the core or swap it for a new one.
Dallas water runs hard, averaging 8 to 12 grains per gallon in most neighborhoods, and that mineral load cooks onto the exchanger every heating cycle. Add our freeze events, when outdoor units hit 20 degrees and split a coil overnight, and you get the two most common failures we see. If your tankless water heater heat exchanger repair in Dallas, Texas is overdue, you will notice lukewarm showers, popping noises, or a slow drain of hot water within 30 seconds.
Our Heat Exchanger Repair Process
Five steps, one visit in most cases. We text you an arrival window, show up in a marked truck, and leave the workspace cleaner than we found it.
01
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
02
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
03
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
04
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Tools and Methods We Use
Tools & Equipment
Descaling Pump and Flush Kit
Circulates food-grade descaling solution through the exchanger to strip calcium and restore flow without disassembly.
Thermal Camera
Reveals hot spots, cold zones, and hidden leaks in the exchanger and fittings that a visual inspection misses.
Manifold Pressure Gauge
Verifies gas pressure at the burner so the exchanger is not running lean or rich, which shortens its life.
Combustion Analyzer
Confirms clean burn and correct venting after an exchanger swap, catching soot or backdraft issues before they cause damage.
Water Flow Meter
Measures gallons per minute at the outlet to confirm the exchanger is delivering rated flow after repair.
Multimeter
Tests flame sensors, igniters, and control board signals tied to exchanger-related error codes.
Tube Brush and Pressure Gauge
Cleans internal passages on serviceable exchangers and pressure-tests the system at 80 psi before we close up.
Methods & Standards
UPC and IPC Code Compliance
Every venting, gas, and water connection we touch is brought up to Uniform Plumbing Code and International Plumbing Code standards. That protects your inspection and your warranty.
Manufacturer-Specific Procedures
Rinnai and Navien publish exact torque specs, gasket sequences, and diagnostic flows for their exchangers. We follow them, which is why our repairs hold and the warranty stays valid.
Descaling Before Replacement
We always try descaling first when the core is intact. It saves customers $300 to $700 versus a replacement and restores performance in most scaled-but-uncracked units.
Post-Repair Verification
After every job we fire the burner, measure outlet temperature, check flow rate, and pressure-test. If the numbers are off, we do not call the job done.
When to Call for Heat Exchanger Repair
01
Your Rinnai or Navien is 4 to 6 years old and has never been descaled in Dallas hard water.
What we do: We pull the unit, inspect the exchanger with a thermal camera, and run a full descaling cycle. If scale has already cracked the core, we swap it for an OEM replacement the same visit.
→ Hot water restored, gas usage drops 8 to 15 percent, and the unit runs another 5 to 8 years with annual flushes.
02
A winter freeze cracked the exchanger on your outdoor-mounted unit in Lakewood or East Dallas.
What we do: We replace the cracked exchanger, install freeze protection with insulation and drain-down valves, and test the burner and venting before we leave.
→ Unit survives the next freeze without damage, and you avoid a full replacement bill.
03
You manage a rental in Uptown and the tenant reports no hot water with error code 11.
What we do: We dispatch same-day, diagnose the exchanger, and either descale or replace it. We document the work with photos and a written report for your records.
→ Tenant has hot water the same day, and you have warranty paperwork for the repair.
04
Your commercial kitchen in Deep Ellum runs two tankless units and one is losing pressure.
What we do: We service the failing unit during off-hours, descale or replace the exchanger, and check the second unit while we are on site to prevent a second outage.
→ Kitchen stays open, both units run at rated flow, and you get a maintenance schedule to prevent repeat failures.
How Heat Exchanger Repair Runs in Dallas
Dallas water is the main driver of heat exchanger failure here. Average hardness runs 8 to 12 grains per gallon, and that calcium deposits on the copper core every heating cycle. Without annual descaling, most units scale up within 3 to 5 years. Add our winter freezes, when outdoor-mounted units hit 20 degrees and split a coil overnight, and you get the two calls we run most. Older homes in Oak Lawn and East Dallas often have undersized gas lines and PVC venting that was never upgraded, which makes the exchanger run hot and fail early. We correct gas sizing and venting to IPC standards on every job. Whether you need tankless water heater heat exchanger cleaning Dallas TX or a full tankless water heater heat exchanger replacement in Oak Lawn Dallas TX, our trucks cover Dallas County seven days a week.
Neighborhoods We Serve
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Uptown Dallas
High-rise condos often have shared venting and tight mechanical closets, so we bring compact tools and coordinate with building management for access.
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Oak Lawn
Many 1920s to 1950s homes here have original gas lines sized for tank units. We check manifold pressure and upgrade the gas flex connector when needed.
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Lakewood
Outdoor-mounted tankless units are common and take the brunt of winter freezes. We install freeze protection on every repair we do here.
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Deep Ellum
Commercial kitchens and lofts run multiple units hard. We schedule off-hours service to keep businesses open and tenants with hot water.
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University Park
Larger homes with high flow demand benefit from recirculation pumps, which we size correctly to avoid over-cycling the exchanger.
Local Conditions We Plan For
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Hard water at 8 to 12 grains per gallon
Scale builds on the exchanger faster than in most US cities, so we recommend annual descaling instead of the manufacturer's typical 2-year interval.
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Winter freezes dropping to 20 degrees or below
Outdoor units crack exchangers overnight. We install freeze protection kits and drain-down valves on every repair in exposed locations.
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Older housing stock with undersized gas lines
Low gas pressure causes flame failure and soot, which damages the exchanger. We verify manifold pressure and upgrade the supply when needed.
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Summer inlet water above 80 degrees
Warmer inlet water reduces the temperature rise the exchanger must deliver, but it also means scale cooks on faster. We adjust descaling frequency accordingly.
Scaled Rinnai Restored in Uptown
Problems We Solve With Heat Exchanger Repair
Most Dallas heat exchanger failures show up as one of these four symptoms. If you recognize yours, call (214) 817-0188 before the damage spreads.
Problem
No hot water or lukewarm showers
A clogged or cracked exchanger cannot transfer heat, so the burner runs but the water never reaches setpoint. Left alone, the unit eventually locks out on error code.
Our Fix
We descale or replace the exchanger, verify 120-degree output at the tap, and confirm the burner is firing clean. Most jobs finish the same day.
Problem
Error codes flashing on the display
Codes like Rinnai 11, 12, or 16 often mean flame failure or flow restriction tied to the exchanger. Ignoring them leads to repeated lockouts and a dead unit.
Our Fix
Our tech reads the code, tests the exchanger with a thermal camera, and repairs or replaces the core. We clear the code and run a full cycle before leaving.
Problem
Water leaking from the unit
A pinhole in the exchanger soaks drywall, subfloor, and cabinets within hours. Dallas humidity makes mold growth fast, and repairs climb into the thousands.
Our Fix
We shut off water, pull the unit, and swap the leaking exchanger or fitting. Pressure test at 80 psi confirms the fix before we turn water back on.
Problem
Loud popping or banging noises
Scale on the exchanger traps steam and causes popping that stresses the copper. Over time the core cracks and the unit fails completely.
Our Fix
Descaling with a flush kit and pump removes the scale. If the core is already damaged, we replace it with an OEM part and install a water filter to prevent recurrence.
Why Dallas Homeowners Repair Instead of Replace
A heat exchanger swap costs a fraction of a new unit and keeps the rest of your system under warranty. Here is what you actually gain when you call us instead of a big-box installer.
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Restore Full Hot Water
A clean exchanger delivers 6 to 9 gallons per minute again, so two showers and the dishwasher can run at once. Most customers feel the difference the same afternoon we finish tankless water heater heat exchanger repair in Dallas, Texas.
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Cut Gas and Power Bills
A scaled exchanger forces the burner to run longer to hit setpoint. After descaling, Dallas homeowners typically see 8 to 15 percent lower gas usage on their next Atmos bill, because the unit reaches 120 degrees in half the time.
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Extend Unit Life 5+ Years
Replacing a $400 to $900 exchanger on a Rinnai, Navien, or Noritz that is only 6 years old beats a $3,200 new install. We also install isolation valves and a water filter so the next core lasts longer.
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Stop Leaks Before Damage
A pinhole in the exchanger soaks drywall and subfloor fast. Our technicians catch weeping joints with a thermal camera and pressure gauge before water reaches your ceiling, saving thousands in Dallas water damage repairs.
Licensed, Certified, and Reviewed
Licensed & Certified
- Texas State Board of Plumbing Examiners (TSBPE) License — issued by Texas State Board of Plumbing Examiners
- NATE Certification — issued by North American Technician Excellence
- EPA Section 608 Certification — issued by U.S. Environmental Protection Agency
- OSHA Safety Certification — issued by Occupational Safety and Health Administration
- Rinnai and Navien Manufacturer Training — issued by Rinnai America and Navien Inc.
Verified Reviews
Google ★★★★★4.9
Called about a Navien error code and they had a tech out the same afternoon. Diagnosed a scaled exchanger, descaled it, and showed me the before-and-after flow readings. Honest pricing and no pressure to replace the whole unit.
Yelp ★★★★★4.8
Our Rinnai cracked during the freeze and they replaced the exchanger the next morning. Brought the OEM part, installed freeze protection, and cleaned up everything. Fair price for emergency work.
BBB ★★★★★4.9
Managed a heat exchanger replacement for our rental property in Oak Lawn. They handled the warranty paperwork, sent photos, and finished in one visit. Will use them for all our Dallas units.
Google ★★★★★5.0
Professional, licensed, and they actually answer the phone. Descaling service on our Noritz took about an hour and hot water is back to full temperature. Scheduling the annual flush with them now.
Heat Exchanger Expertise You Can Verify
Our technicians hold Texas State Board of Plumbing Examiners (TSBPE) licenses and carry NATE certification plus EPA Section 608 for refrigerant work on hybrid systems. We complete manufacturer-specific training on Rinnai and Navien platforms every year, and we work to Uniform Plumbing Code (UPC) and International Plumbing Code (IPC) standards on every job. That means code-correct venting, gas sizing, and pressure relief valve installation, not shortcuts. We have pulled, cleaned, and replaced thousands of exchangers across Dallas County, from Downtown high-rises to Lakewood bungalows.
- TSBPE-licensed plumbing contractor with NATE-certified technicians on staff
- EPA Section 608 certified for gas and hybrid tankless systems
- Annual Rinnai and Navien factory training on exchanger diagnostics
- UPC and IPC code compliance on every venting and gas connection
- OSHA safety certification on all field crews and job sites
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
Why does my tankless water heater heat exchanger fail in Dallas TX?
Hard water scale is the number one cause in Dallas, followed by freeze damage. Our water averages 8 to 12 grains per gallon, and that calcium cooks onto the copper every cycle. After 3 to 5 years without descaling, the core clogs, overheats, and cracks. Winter freezes split outdoor units too.
How much does tankless water heater heat exchanger repair cost in Dallas?
Most repairs run $350 to $850 in 2026, and full replacements run $600 to $1,400 depending on brand. Descaling alone is $180 to $350. Rinnai and Navien cores cost more than Takagi or Bosch. We quote the exact number after diagnosis, before any work starts.
Who repairs tankless water heater heat exchangers near me in Dallas TX?
We do, across Dallas County. Our TSBPE-licensed techs cover Uptown, Oak Lawn, Deep Ellum, Lakewood, University Park, and every ZIP from 75098 to 75237. Call (214) 817-0188 and we will confirm the arrival window on the phone.
Can a tankless water heater heat exchanger be repaired same day in Dallas?
Yes, in most cases. We stock common exchangers for Rinnai, Navien, Noritz, and Rheem on the truck, so a same-day swap is routine. If your brand is unusual, we can usually source the part within 24 hours and schedule the return visit.
Related Services
Tankless Water Heater Installation
New installs in Dallas include proper sizing, stainless steel venting, and isolation valves from day one, which prevents the scale and freeze problems that lead to heat exchanger failure later.
View Tankless Water Heater InstallationTankless Water Heater Repair
Error codes, ignition failure, and no-hot-water calls often trace back to the exchanger. We diagnose the whole unit, not just the symptom, so you are not paying twice for the same problem.
View Tankless Water Heater RepairTankless Water Heater Maintenance
Annual maintenance catches scale before it cooks onto the exchanger. Dallas homeowners on our maintenance plan get priority scheduling and typically double the life of their heat exchanger.
View Tankless Water Heater MaintenanceTankless Water Heater Replacement
When the exchanger is cracked and the unit is past 12 years, replacement beats repair. We handle the swap, disposal, and code-correct venting in a single visit across Dallas.
View Tankless Water Heater ReplacementTankless Water Heater Tune-Ups
A tune-up includes a flush, filter check, and burner inspection. It is the cheapest way to protect a heat exchanger and keep your Rinnai or Navien running at rated efficiency.
View Tankless Water Heater Tune-UpsTankless Water Heater Flushing & Descaling
Our descaling service uses a flush kit and food-grade solution to strip calcium from the exchanger. Dallas water makes this a yearly job, not a five-year one, if you want the core to last.
View Tankless Water Heater Flushing & DescalingContact Our Dallas Tankless Team
Call (214) 817-0188 any time, day or night, and we'll get a real person on the line. For non-emergency work, most Dallas jobs get a same-day or next-day appointment. You can also email info@waterheaterrepairs.com and we'll respond within one business day.
Water Heater Repairs
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Phone
(214) 817-0188 -
Address
14205 Proton Rd, Dallas, TX 75244, Dallas, Texas
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Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available