New Tankless Unit
We supply the replacement unit in the size and brand that fits your home, whether that is a Rinnai, Navien, Noritz, or Rheem. We confirm the model with you before ordering.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
Workmanship Guaranteed in Dallas
What Our Tankless Replacement Includes
Every tankless water heater replacement Dallas TX job we run covers the full swap, not just the unit. Here is what is in the standard scope, and what we quote separately if your home needs it.
Gas and Water Reconnect
New gas flex connector, copper pipe or PEX tubing, isolation valves, and a pressure relief valve. Every threaded joint gets Teflon tape and a leak check before startup.
Venting and Combustion Test
Stainless steel or PVC venting installed to code, then verified with a combustion analyzer. We confirm the unit burns clean and the venting pulls properly.
Permit and Inspection
We pull the Dallas permit where required and meet the inspector on-site. You get the signed-off paperwork for your records and your warranty file.
Startup and Walkthrough
We fire the unit, set the outlet temperature, and run hot water at every fixture. You get a walkthrough on the display, the filter, and the descaling interval.
Old Unit Haul-Away
We disconnect the old unit, drain it, and haul it off. No tank or tankless carcass left on your curb or in your garage.
Tankless Water Heater Replacement Dallas TX Explained
Tankless water heater replacement Dallas TX is a licensed plumbing service that removes a failed or aging tankless unit and installs a new one on the same gas, water, and venting connections. We isolate the water and gas, drain the old heat exchanger, pull the unit off the wall bracket, and set the new one. Then we reconnect the copper pipe or PEX tubing, swap in fresh isolation valves and a pressure relief valve, and pressure-test the whole run before we light it.
Most Dallas homeowners call us when the unit throws error codes, the water never gets hot, or the heat exchanger starts leaking. Hard water across Dallas County scales up heat exchangers fast, and freeze damage from a February cold snap can crack a manifold overnight. If you need a tankless water heater swap Dallas residents trust, we stock common Rinnai and Navien models on the truck so a same-day tankless water heater swap in Dallas 24/7 is often possible.
Our Tankless Replacement Process
Five steps, two to four hours, and a clean wall when we leave. Here is exactly what happens from the first phone call to the final hot-water test.
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.
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Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Tools and Methods We Use
Tools & Equipment
Combustion analyzer
Verifies clean burn and proper venting on every gas tankless startup. If the reading is off, we adjust before we leave.
Manifold pressure gauge
Checks incoming and manifold gas pressure against the manufacturer spec. Wrong pressure is a common cause of ignition failure.
Thermal camera
Finds hidden leaks and hot spots behind the wall and along the venting run without opening drywall.
Descaling pump and flush kit
Pumps descaling solution through the heat exchanger to remove Dallas hard-water scale and restore flow rate.
Water flow meter
Measures actual gallons per minute at the fixture so we size the replacement unit correctly.
Multimeter
Tests electrical connections, sensors, and control boards on electric and gas tankless units.
Tube brush and pressure gauge
Cleans inlet filters and confirms system pressure after the swap.
Methods & Standards
Uniform Plumbing Code (UPC) compliance
We install to UPC standards for gas, water, and venting. That keeps the job inspection-ready and protects your manufacturer warranty.
International Plumbing Code (IPC) cross-check
Where Dallas adopts IPC provisions, we cross-check venting clearances and gas sizing so the install passes the first inspection.
Manufacturer-specific training (Rinnai, Navien)
We follow Rinnai and Navien install specs exactly, from vent length to gas pressure. Off-spec installs void the warranty and cause callbacks.
OSHA safety protocol
Gas isolation, ventilation, and lockout procedures on every job. We treat every replacement like a live gas job because it is one.
Post-install pressure and leak test
We pressure-test the water side and leak-check every gas joint before startup. No shortcuts, no callbacks.
When to Replace Your Tankless Unit
01
Your tankless unit is 15 years old and still running, but hot water is inconsistent.
What we do: We assess the heat exchanger, gas pressure, and flow rate. If the unit is at end of life, we quote a like-for-like swap with a modern condensing model.
→ Steady hot water at every fixture and lower gas use, usually within a single visit.
02
You just bought a Dallas home with an undersized tankless unit that cannot run two showers.
What we do: We calculate flow rate and temperature rise, then recommend a properly sized unit. We handle the swap and any gas or venting changes.
→ Two showers and the dishwasher at once, with no temperature swing.
03
Your unit failed during a cold snap and the manufacturer part is on backorder.
What we do: We source a comparable Rinnai or Navien unit from local stock and install it on the existing connections where possible.
→ Hot water back in a day instead of a week, with a warranty on the new unit.
04
You are converting a rental property and want a reliable unit with low maintenance.
What we do: We install a unit with isolation valves, a water filter, and a descaling schedule. We document the install for the warranty file.
→ Fewer tenant calls, a clean inspection record, and a unit that lasts.
How Tankless Replacement Runs in Dallas
Dallas water runs hard, and that shapes every tankless water heater replacement in Dallas, Texas we run. Scale builds up in heat exchangers faster here than in softer-water markets, so we recommend a water filter and an annual descaling schedule on every install. North Texas cold snaps are the other factor. A hard freeze can crack a manifold or split copper pipe overnight, and we see a spike in emergency calls after every freeze event. Older homes in East Dallas and Oak Lawn often have undersized gas lines and venting that needs rerouting, while newer builds in North Dallas usually take a like-for-like swap. We pull the Dallas permit, install to UPC and IPC, and test combustion with an analyzer before we leave. If you need a tankless water heater replacement in East Dallas or a tankless water heater replacement in University Park TX, we cover the whole county.
Neighborhoods We Serve
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Lakewood
Older homes with original gas lines often need upsizing before a high-BTU tankless unit goes in.
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University Park
Larger homes with multiple bathrooms usually need a bigger unit or two units plumbed in series.
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Deep Ellum
Lofts and mixed-use buildings need venting routed to code without disturbing neighboring units.
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North Dallas
Newer construction typically takes a like-for-like swap with minimal venting changes.
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Oak Lawn
Mid-century homes often have tight mechanical closets that limit venting options.
Local Conditions We Plan For
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Hard water across Dallas County
Scale coats heat exchangers and drops flow rate. We add a water filter and set a descaling schedule on every replacement.
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North Texas freeze events
Freeze damage cracks manifolds and splits pipe. We install freeze protection and insulate exposed lines on every job.
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Older housing stock in East Dallas
Undersized gas lines and outdated venting often need upgrades during a swap. We quote those changes up front.
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Dallas permit and inspection requirements
We pull the permit and meet the inspector so the install is signed off and your warranty stays valid.
12-Year-Old Rinnai Swap in Lakewood
Problems We Solve With Tankless Replacement
Most Dallas replacements start with one of these failures. If any of them sound familiar, a swap is usually the cheaper path forward.
Problem
No hot water and repeated error codes
You are stuck with cold showers and a unit that resets but fails again within days. Ignition failure and flame failure codes often point to a heat exchanger past its useful life.
Our Fix
We read the code, test the igniter and gas valve, and check the heat exchanger. If the repair cost approaches half the price of a new unit, we quote a replacement and let you decide.
Problem
Leaking water from the unit or fittings
A slow drip corrodes the wall bracket and can damage drywall, flooring, and nearby electrical. A cracked heat exchanger leaks internally and cannot be patched.
Our Fix
We isolate the water, pull the unit, and inspect the wall behind it. If the leak is a fitting we repair it. If the heat exchanger is cracked, we replace the unit and pressure-test the new install.
Problem
Scale buildup and pressure drop
Dallas hard water coats the heat exchanger with scale, which drops flow rate and raises gas use. Eventually the unit cannot keep up with a single shower.
Our Fix
We descale first with a flush kit and descaling solution. If flow does not recover, the heat exchanger is too far gone and we quote a replacement with a water softener integration to prevent a repeat.
Problem
Freeze damage after a North Texas cold snap
A hard freeze cracks manifolds and splits copper pipe. You end up with no hot water and water damage at the same time.
Our Fix
We replace the damaged unit, insulate the lines, and set freeze protection on the new unit. We also check the venting for ice blockages before we leave.
Why Dallas Homeowners Replace Tankless Units
A new tankless unit restores endless hot water, cuts standby losses, and protects your walls from a leaking heat exchanger. Here is what a proper replacement gets you.
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Endless Hot Water Restored
A new unit delivers 7 to 11 gallons per minute, so two showers and the dishwasher can run at once without a temperature swing. No more waiting on recovery between loads.
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Lower Gas and Electric Bills
Modern condensing units run 0.95 UEF or better, which trims 10 to 20 percent off water heating costs versus a 10-year-old unit. That adds up over a Dallas summer of high utility bills.
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Code-Correct Venting and Gas
We size stainless steel venting and gas flex connectors to Uniform Plumbing Code and International Plumbing Code, so the install passes inspection and the combustion analyzer reads clean at startup.
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Fewer Emergency Call-Outs
Fresh isolation valves, a water filter, and a descaling schedule cut scale buildup and ignition failure. You avoid the 2 a.m. no-hot-water call and the emergency premium that comes with it.
Licensed, Certified, and Reviewed
Licensed & Certified
- State-Licensed Plumbing Contractor — issued by Texas State Board of Plumbing Examiners (TSBPE)
- NATE Certification — issued by North American Technician Excellence
- EPA Section 608 Certification — issued by U.S. Environmental Protection Agency
- Manufacturer-Specific Training — issued by Rinnai and Navien
- OSHA Safety Certification — issued by Occupational Safety and Health Administration
Verified Reviews
Google ★★★★★4.9
Quoted my tankless swap in the morning and had it installed by the afternoon. They rerouted the venting, upsized the gas line, and tested every fixture. Hot water has been steady since.
Yelp ★★★★★4.8
Our unit cracked during the freeze and they came out the next day. Clean install, no mess, and they walked me through the descaling schedule. Fair price for the work.
BBB ★★★★★4.9
We manage a building in Deep Ellum and needed a swap that would not disrupt tenants. They worked around our schedule and passed inspection the first time.
Google ★★★★★5.0
Straight answers on whether to repair or replace. They showed me the cracked heat exchanger and quoted both options. Went with the replacement and could not be happier.
Tankless Expertise Built in Dallas
Our techs hold Texas State Board of Plumbing Examiners (TSBPE) licenses and carry NATE certification and EPA Section 608 credentials for refrigerant and gas work. We train on Rinnai and Navien platforms directly, which matters when a manufacturer-specific venting or gas-pressure spec decides whether the warranty holds. We work on Rinnai, Navien, Noritz, Takagi, Bosch, Rheem, A.O. Smith, Bradford White, Stiebel Eltron, and Eemax units every week, from a single-family home in Lakewood to a commercial kitchen in Deep Ellum.
- State-licensed plumbing contractor with TSBPE credentials on every job
- NATE-certified techs trained on Rinnai and Navien platforms
- EPA Section 608 certification for gas and refrigerant handling
- Combustion analyzer and thermal camera on every replacement call
- Uniform Plumbing Code and International Plumbing Code compliance built in
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
How much does tankless water heater replacement cost in Dallas TX?
Most residential swaps in Dallas run $1,800 to $3,800 in 2026, including the unit, labor, venting, and permit. A like-for-like Rinnai or Navien swap sits at the low end. Upsizing gas lines, adding a recirculation pump, or switching from tank to tankless pushes the number higher. We quote the full price before we start.
How long does a tankless water heater replacement take in Dallas?
A straight swap takes two to four hours. If we need to reroute stainless steel venting, upsize the gas line, or add a water softener loop, plan on a full day. We give you a time window when we book and call ahead when we are on the way.
When should I replace my tankless water heater in Dallas?
Plan on 15 to 20 years for a well-maintained unit. Replace sooner if you see a leaking heat exchanger, repeated ignition failure, or error codes that come back after a descaling. Dallas hard water accelerates scale buildup, so annual flushing stretches the unit's life.
Can I replace a tankless water heater myself in Dallas?
No. Texas requires a licensed plumber for gas and water connections, and the work must meet Uniform Plumbing Code and pass city inspection. DIY gas work also voids the manufacturer warranty. We handle the permit, the install, and the inspection so you are covered.
Related Services
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First-time tankless installs for Dallas homes, including gas line sizing, venting, and permit work. We handle the full conversion from a tank unit and test every fixture before we leave.
View Tankless Water Heater InstallationTankless Water Heater Repair
Error code diagnostics, ignition and burner repair, and heat exchanger fixes for Dallas units. If a repair beats a replacement on cost, we tell you straight and do the fix.
View Tankless Water Heater RepairTankless Water Heater Maintenance
Annual service that keeps your Dallas unit running at spec. We check gas pressure, clean the inlet filter, and inspect the venting so small issues do not become replacements.
View Tankless Water Heater MaintenanceTankless Water Heater Tune-Ups
A quick tune-up resets your unit for peak efficiency. We run a combustion analyzer, verify flow rate, and adjust the outlet temperature for Dallas water conditions.
View Tankless Water Heater Tune-UpsTankless Water Heater Flushing & Descaling
Dallas hard water scales heat exchangers fast. We pump descaling solution through the unit with a flush kit and restore flow before scale causes a replacement.
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Electric tankless installs for Dallas homes without gas service. We size the panel, run the circuit, and mount the unit for steady hot water at every fixture.
View Electric Tankless Water Heater InstallationContact 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