Full Leak Diagnosis
We inspect the heat exchanger, pressure relief valve, isolation valves, gas flex connector, and all water connections. A thermal camera and pressure gauge confirm the exact source before we quote the repair.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
Workmanship Guaranteed in Dallas
What Our Leak Repair Service Includes
Every tankless water heater leak repair Dallas TX call includes a full diagnosis, the repair itself, and a pressure test to confirm the fix. Here is what is covered. If we find a second issue while we are in there, we tell you before we touch it.
Part Replacement
Failed gaskets, O-rings, valves, and fittings are replaced with OEM parts for Rinnai, Navien, Noritz, Rheem, and Bosch units. We carry the most common parts on the truck.
Pressure Test
After the repair, we pressurize the system and hold it for 15 minutes. If the gauge does not move, the leak is sealed. We do not leave until it holds.
Combustion Check
On gas units, we run a combustion analyzer and check the manifold pressure gauge reading after any repair near the burner or gas line. Safety comes before we call the job done.
Cleanup and Walkthrough
We dry the area, restore the panel, and walk you through what failed and why. You get a plain explanation and a warranty on the part and labor.
Tankless Water Heater Leak Repair Dallas TX
Tankless water heater leak repair Dallas TX is a diagnostic and repair service that locates the source of water escaping a tankless unit and restores it to safe operation. Water can come from the heat exchanger, a pressure relief valve, the condensate line, or a loose fitting on the copper pipe or PEX tubing. We isolate the leak, pressure-test the system, and replace only the failed part.
Dallas homes take a beating on tankless units. Our water runs hard, and scale buildup inside the heat exchanger is the number one cause of pinhole leaks we see. Temperature swings from 105-degree summers to hard winter freezes crack fittings and split valves. If you search for a tankless water heater leak fix Dallas TX near me, we can be at your door the same day.
How Our Leak Repair Process Works
No mystery, no runaround. Here is exactly what happens from the moment you call until the water is back on and the leak is gone.
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
Thermal Camera
Finds hidden moisture behind walls and inside cabinets. It shows us the exact leak path so we are not opening drywall blindly.
Pressure Gauge
Confirms system pressure before and after repair. A 15-minute hold test tells us the leak is truly sealed.
Manifold Pressure Gauge
Checks gas pressure on gas tankless units after any repair near the burner or gas line. Required for safe operation.
Combustion Analyzer
Verifies safe combustion and exhaust on gas units. We run it after every repair that touches the burner chamber or venting.
Descaling Pump and Flush Kit
Clears scale buildup from the heat exchanger. This is the best preventive step against pinhole leaks in Dallas hard water.
Water Flow Meter
Measures flow rate to confirm the unit is sized correctly. Undersized units overwork and fail early.
Multimeter
Tests electrical components on electric tankless units from Stiebel Eltron and Eemax. Confirms element and board function.
Methods & Standards
Uniform Plumbing Code (UPC) Compliance
Every repair follows the UPC as adopted in Dallas. We use proper materials, correct fittings, and code-compliant venting. No shortcuts that fail inspection.
International Plumbing Code (IPC) Standards
Where IPC applies, we follow it. This covers gas line sizing, venting clearances, and pressure relief valve requirements on tankless installations and repairs.
Manufacturer-Specific Training
We have completed Rinnai and Navien factory training. That means we know the internal layout, common failure points, and correct part numbers for the units we service.
EPA Section 608 Safety Protocol
Our combustion and venting work follows EPA Section 608 standards. Every gas unit gets a combustion analyzer check before we sign off.
When to Call for Tankless Leak Repair
01
You notice a puddle under your tankless unit in a Downtown Dallas condo closet.
What we do: We shut off the supply, diagnose the leak with a thermal camera, and repair the failed part. Most condo closet units are tight, so we bring compact tools and work clean.
→ Leak sealed, closet dried, hot water restored the same day. No damage to the surrounding drywall or flooring.
02
Your Rinnai unit is showing an error code and dripping water after a winter freeze in North Dallas.
What we do: We inspect for freeze damage, replace any cracked fittings or valves, and run a full combustion check. If the heat exchanger is cracked, we quote repair versus replacement.
→ Unit back online with a clean combustion reading. Freeze protection installed so the next cold snap does not repeat the problem.
03
A property manager in Deep Ellum has a commercial tankless bank leaking and tenants without hot water.
What we do: We prioritize commercial leak calls and dispatch same-day. We isolate the leaking unit, repair it, and keep the rest of the bank running so tenants are not without hot water.
→ Leak fixed without shutting down the whole system. Tenants keep hot water, and the repair is warrantied.
04
You are selling a home in University Park and the inspection flagged a slow drip from the tankless unit.
What we do: We diagnose and repair the leak, then provide documentation of the pressure test and repair for your real estate agent. Fast turnaround for closing deadlines.
→ Clean inspection report, documented repair, and a closed sale without a last-minute plumbing surprise.
How Tankless Leak Repair Works in Dallas
Dallas has some of the hardest water in Texas, and that is the root cause of most tankless leaks we see. Minerals build up inside the heat exchanger until pinholes form. Add our temperature swings, 105-degree summers and hard winter freezes, and you get cracked fittings and split valves every January. Older homes in East Dallas and Oak Lawn often have tankless units retrofitted into tight closets with copper pipe that has seen better days. Newer builds in North Dallas and Uptown usually have PEX tubing and isolation valves, which makes repairs faster. We know the Dallas County plumbing code and pull permits when required. If you need tankless water heater leak repair in Dallas, Texas, we handle it the same day in most cases.
Neighborhoods We Serve
-
Downtown Dallas
High-rise condos often have tankless units in tight utility closets. We bring compact tools and work clean to avoid damage to surrounding finishes.
-
Oak Lawn
Many older homes here have retrofitted tankless systems with aging copper pipe. We inspect the full run, not just the unit, when we find a leak.
-
Lakewood
Lakewood homes often have tankless units in garages or attics. Attic installs are more vulnerable to freeze damage, so we check insulation and freeze protection.
-
North Dallas
Newer builds with PEX tubing and isolation valves make leak repairs faster. We still pressure-test the full system to catch hidden issues.
-
University Park
Larger homes here often run multiple tankless units. We service each one and check the manifold pressure on gas units during every visit.
Local Conditions We Plan For
-
Hard water with high mineral content
Scale buildup inside the heat exchanger is the leading cause of pinhole leaks in Dallas. Annual descaling is the best prevention.
-
Winter freeze events
Dallas freezes crack fittings and split valves. We see a spike in leak calls every January and February. Freeze protection prevents most of them.
-
Attic and garage installations
Units in unconditioned spaces face bigger temperature swings. We check insulation and venting on every attic or garage call.
-
Older housing stock in central Dallas
Retrofitted tankless units in older homes often have aging copper pipe. We inspect the full water line, not just the unit, when we find a leak.
Navien Heat Exchanger Pinhole Leak
Tankless Leak Problems We Solve in Dallas
Most tankless leaks fall into a handful of categories. We have seen them all, and we know how to fix each one without replacing parts that are still good.
Problem
Water dripping from the bottom of the unit
Usually a failed heat exchanger or condensate line. Left alone, it corrodes the cabinet and shorts the electronics.
Our Fix
We pressure-test the heat exchanger and inspect the condensate trap. If the exchanger is cracked, we quote repair versus replacement with real numbers. If it is the condensate line, we clear and reroute it.
Problem
Leak at the water inlet or outlet fittings
Loose or corroded fittings drip constantly and can soak a cabinet base or garage slab within days.
Our Fix
We shut off the isolation valves, remove the fitting, and reseal with Teflon tape or replace the gasket. A pressure test confirms the fix before we leave.
Problem
Pressure relief valve weeping
A weeping relief valve means excess pressure in the system. Ignoring it can lead to a full valve failure and a flood.
Our Fix
We check system pressure with a gauge, replace the pressure relief valve if it is stuck, and verify the expansion tank is working correctly.
Problem
Freeze damage after a Dallas cold snap
Frozen fittings crack and split. When they thaw, water pours out fast and can flood an attic or closet.
Our Fix
We replace the cracked fittings, inspect the heat exchanger for freeze damage, and install freeze protection so it does not happen again next winter.
Problem
Scale buildup causing pinhole leaks
Dallas hard water deposits minerals inside the heat exchanger until pinholes form. This is the leading cause of tankless leaks here.
Our Fix
We repair or replace the damaged section, then flush the unit with a descaling pump and descaling solution. We also recommend a water softener to prevent a repeat.
Why Dallas Homeowners Call Us First
A leaking tankless unit is not a wait-and-see problem. Water finds drywall, subfloor, and electrical panels fast. Here is what you get when you call us.
-
Same-Day Leak Diagnosis
We stock the most common parts for Rinnai, Navien, and Noritz units on our trucks. That means most tankless water heater leak repair Dallas TX calls are diagnosed and fixed in one visit, usually within two to four hours of arrival.
-
We Find the Real Source
A drip under the unit is not always the heat exchanger. We use a thermal camera and pressure gauge to trace the leak to the exact fitting, valve, or gasket. Fixing the wrong part wastes your money and leaves water damage behind.
-
Code-Correct Repairs
Every repair follows the Uniform Plumbing Code and International Plumbing Code as adopted in Dallas. We use stainless steel venting and proper gas flex connectors, and we test the manifold pressure gauge reading before we sign off on the job.
-
We Protect Your Floors
Water from a leaking tankless unit can soak a cabinet base or a garage slab in hours. We shut off the supply, dry the area, and confirm no moisture is left behind. You get a dry floor and hot water back the same day.
Licensed, Certified, and Warrantied
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
- Rinnai Manufacturer Training — issued by Rinnai America Corporation
- Navien Manufacturer Training — issued by Navien Inc.
Verified Reviews
Google ★★★★★4.9
Fast, honest, and they knew exactly what was wrong with my Navien. Found a pinhole in the heat exchanger, repaired it, and saved me from buying a new unit. Pressure-tested it in front of me. Highly recommend for any tankless leak in Dallas.
Yelp ★★★★★4.8
Called at 7 a.m. with water pouring from my attic unit. Tech was here by 9. Replaced a cracked fitting from the freeze and had hot water back by lunch. Fair price, no drama. These guys know tankless systems.
BBB ★★★★★4.9
I manage rental properties in Dallas and have used them for three leak repairs this year. Every job was same-day, warrantied, and clean. They document everything and send photos. Exactly what a property manager needs.
Google ★★★★★5.0
The first company told me I needed a whole new tankless unit. These guys pressure-tested it, found a failed gasket, and fixed it for $220. Honest work and they explained everything. I will not call anyone else in Dallas.
Tankless Leak Repair Experience You Can Verify
Our technicians hold Texas State Board of Plumbing Examiners (TSBPE) licenses and carry NATE certification for gas appliance work. We have completed manufacturer-specific training with Rinnai and Navien, so we know the internal layout of the units we open. EPA Section 608 certification covers our refrigerant and combustion safety work. Every repair follows UPC and IPC standards, and we document the manifold pressure gauge reading and combustion analyzer results on every gas unit we touch. We work on Bosch, Takagi, A.O. Smith, Bradford White, Stiebel Eltron, and Eemax units as well.
- TSBPE-licensed plumbing technicians on every leak repair call
- NATE-certified for gas tankless diagnostics and ignition repair
- Manufacturer-trained on Rinnai and Navien heat exchanger systems
- EPA Section 608 certified for combustion and venting safety
- Thermal camera and pressure gauge used on every diagnosis
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
Why is my tankless water heater leaking in Dallas TX?
The most common cause in Dallas is scale buildup inside the heat exchanger, which eats pinholes through the metal over time. Hard water is the culprit. Other causes include a failed pressure relief valve, a cracked isolation valve, freeze damage from a winter cold snap, or a loose fitting on the copper pipe or PEX tubing. We diagnose the exact source before quoting any repair.
How much does tankless water heater leak repair cost in Dallas?
Typical 2026 pricing in Dallas runs $180 to $650 for most leak repairs. A simple gasket or fitting replacement sits at the low end. A heat exchanger repair or replacement pushes toward the top. Access matters too. A unit in a tight closet or attic takes longer than one on a garage wall. We give you the number before we start.
Who fixes tankless water heater leaks near me in Dallas TX?
We do. Our technicians are TSBPE-licensed and carry NATE certification for gas appliance work. We service every Dallas neighborhood from Downtown and Uptown to Oak Lawn, Lakewood, and University Park. Call (214) 817-0188 and we will dispatch a tech, usually within the hour for leak calls.
Can a leaking tankless water heater be repaired same day in Dallas?
Yes, in most cases. We stock common parts for Rinnai, Navien, Noritz, and Rheem units on our trucks, so gasket, valve, and fitting repairs are finished in one visit. If the heat exchanger is cracked, we may need to order the part, but we can usually cap the leak and restore hot water temporarily while we wait.
Related Services
Tankless Water Heater Installation
If your leaking unit is past repair, we install a new Rinnai, Navien, or Noritz system sized for your Dallas home. We handle the gas line, venting, and permits so you get hot water back fast.
View Tankless Water Heater InstallationTankless Water Heater Repair
Leaks are one of many tankless problems we fix. Error codes, ignition failure, flame failure, and no hot water calls all fall under our general tankless repair service for Dallas homeowners.
View Tankless Water Heater RepairTankless Water Heater Maintenance
Annual maintenance catches the scale buildup and worn gaskets that cause most leaks. We inspect the heat exchanger, test the pressure relief valve, and check all connections before they fail.
View Tankless Water Heater MaintenanceTankless Water Heater Replacement
When a heat exchanger is cracked beyond repair, replacement is often cheaper than a rebuild. We remove the old unit, install the new one, and haul everything away the same day.
View Tankless Water Heater ReplacementTankless Water Heater Tune-Ups
A tune-up includes a full descale, a combustion analyzer check, and a manifold pressure gauge reading. It is the cheapest way to extend the life of a tankless unit in Dallas hard water.
View Tankless Water Heater Tune-UpsTankless Water Heater Flushing & Descaling
We use a descaling pump and flush kit with descaling solution to clear mineral buildup from the heat exchanger. This is the single best preventive step against pinhole leaks in Dallas.
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
-
Phone
(214) 817-0188 -
Address
14205 Proton Rd, Dallas, TX 75244, Dallas, Texas
-
Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available