- BBB A+ Rated
- Mesquite Chamber of Commerce Member
- 30+ Years Experience
Tankless Water Heater Installation in McKinney, TX
James Armstrong Plumbing installs and services tankless water heaters in McKinney, TX. Master Plumber James Armstrong holds Texas License M-39428 with a gas endorsement, which matters here more than on any other plumbing job, because a tankless conversion is as much gas and venting work as it is plumbing.
We size the gas line, spec the venting, pull the McKinney permit, and give you a flat written quote that includes all of it rather than surprising you with it later.
Same-Day Service — Call Before Noon • Most calls are answered within 15 minutes
Licensed Master Plumber
License #M39428
The “Armstrong Clean Promise".
We leave your home cleaner than we found it, or we pay for the cleaning. No mess, no stress — that's our guarantee.
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Our Services
Comprehensive Plumbing Solutions for Homes & Businesses
Most Requested 
Plumbing Repairs and Installation
Get fast help from a trusted plumber in the DFW for leaks, fixture installs, and upgrades. We restore your plumbing with smooth, reliable work.
Water Heater Services
From quick fixes to full replacements, our water heater services in Dallas-Fort Worth, keep your hot water steady. We work on all standard and tankless models.
Most Requested 
Drain Cleaning Services
Stubborn clogs disappear with our drain-cleaning solutions in Texas. We clear the buildup fully so your drains flow the way they should.
Sewer Line Plumbing
Our team handles sewer line plumbing in the DFW , with careful inspection and precise repairs. We keep wastewater moving safely away from your home.
Gas Line Plumbing
Safe and reliable gas line plumbing in the DFW, is just a call away. Whether it’s a leak, repair, or new line, we follow strict safety standards.
Emergency Service
Emergency Service — Available 24/7
Burst pipe? Major leak? Don’t wait. Our emergency team serves the entire DFW area around the clock.
Technician available now
Proudly partnered with leading brands
Meet James Armstrong
Meet the Master Plumber Serving DFW: James Armstrong
James Armstrong has been a Mesquite-resident Master Plumber since 1995. What began as helping neighbors fix leaky faucets turned into a career — and eventually a family business, built on one simple rule: treat people right, do the job with integrity, and always stand behind your work. Today, James and his crew serve Mesquite, Rowlett, Sachse, Garland, and the broader east DFW metro, with most calls dispatched and on-site within 25 minutes of the Mesquite headquarters at 844 Dalworth Dr.
“In thirty years working Rowlett, Garland, and the Lake Ray Hubbard side of the metro, the drain calls almost always come down to two things: tree roots in the older Rowlett neighborhoods near the lake, and grease and hair buildup in the newer developments off Liberty Grove and Schrade Road. We camera-inspect first, then choose hydro-jetting or snaking based on what we actually see — not on what gets you to the highest invoice.”
James Armstrong, Master Plumber • Texas License M-39428 • Founder, James Armstrong Plumbing
Every job comes with the Armstrong Clean Promise — we leave your home cleaner than we found it, guaranteed. No excuses, no mess, no shortcuts. It’s the kind of commitment that’s earned us thousands of repeat customers and a reputation across the DFW metroplex for honest, reliable work.
Why Choose Us
Why McKinney Homeowners Choose James Armstrong
Licensed & Certified Technicians
Our plumbers are fully licensed, professionally trained, and committed to delivering quality workmanship that meets today’s industry standards.
Transparent, Upfront Pricing
No hidden fees and no surprises. Just clear, honest pricing you can trust before we begin any repair or installation.
Fast & Friendly Service
We respect your time. Our technicians arrive promptly, work efficiently, and treat you and your home with courtesy and care.
The Armstrong Clean Promise
Floor protection, shoe covers, and a meticulous cleanup on every job. If your home isn’t cleaner than we found it, we pay for the cleaning.
5-Star Rated by Homeowners Like You
Local families choose us for reliable plumbing and friendly service. Your comfort, safety, and satisfaction are the reasons we do what we do.
Emergency Response Available
Afterhours and weekend emergency calls accepted. $199 emergency service fee — no surprises. Call (214) 918-6109.
Emergency Calls Accepted After Hours & Weekends as well.
Our Process
What to Expect When You Call
Call or Book Online
Speak with a real person, not a call center. We schedule at your convenience.
Same-Day Inspection
A licensed plumber evaluates your issue on-site. No guesswork.
Upfront Quote
You approve the price before work begins. The number you see is final.
Clean, Expert Work
Armstrong Clean Promise — we leave your home better than we found it.
Follow-Up Guarantee
We check in within 24 hours and follow up to ensure everything holds.
Free estimate · No obligation · Real person answers
Service Areas
Serving Communities Across Dallas-Fort Worth
- Allen
- Anna
- Arlington
- Azle
- Balch Springs
- Bedford
- Benbrook
- Blue Mound
- Blue Ridge
- Burleson
- Celina
- Colleyville
- Combine
- Dallas
- Everman
- Fairview
- Farmersville
- Flower Mound
- Forest Hill
- Fort Worth
- Frisco
- Garland
- Grand Prairie
- Plano
- Richardson
- Rowlett
- Sunnyvale
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FAQ
Frequently Asked Questions
Have questions? We’ve got answers. Can’t find what you’re looking for? Give us a call anytime.
Yes. A tankless conversion is planned work with a scheduled start date, which is the kind of job we take in McKinney from our Mesquite shop about 40 minutes away. Master Plumber James Armstrong holds Texas License M-39428 with a gas endorsement, so the gas line and venting work is done in-house rather than subcontracted.
It will shorten its life if the unit is never maintained. McKinney is supplied by the North Texas Municipal Water District, and third-party testing puts hardness near 9 to 10 grains per gallon. A tankless heats water in a narrow exchanger, which is where scale builds. Manufacturers require periodic descaling to keep warranty coverage. If you will keep it on a descaling schedule, a tankless works well here. If you will not, a tank is the better buy.
Usually, yes. A tank runs roughly 40,000 BTU while a whole-house tankless runs 150,000 to 199,000, so most existing runs sized for a tank cannot feed one. Depending on the house that means upsizing the line, running a dedicated line, or confirming the meter can carry the total load. Any quote that does not mention your gas line has not looked at it.
No. Tankless units require their own approved venting, either stainless steel rated for the appliance category or a sealed concentric run depending on the model. Condensing units also produce acidic condensate that needs a neutralizer and a drain, which is an extra consideration on an attic install.
Yes. Applications go through the City of McKinney Citizen Self-Service portal and the work is inspected. Because a conversion touches water, gas, and venting, the inspection covers more than a straight tank replacement. We pull the permit as part of the job. Confirm current requirements with City of McKinney Building Inspections at 469-617-4800.
Leave the building immediately. Do not operate light switches, use a phone inside, or touch any valve. From a safe distance outside, call 911, then your gas utility. Most of McKinney is served by Atmos Energy at 866-322-8667, and parts of Collin County are served by CoServ Gas at 844-330-0763. Check your gas bill if you are unsure which serves your address. Call a plumber only after the utility has made the property safe.
The honest answer is that it depends more on your house than on the unit. Gas line upsizing, meter capacity, venting path and material, condensate routing, and sizing for your peak demand all move the number, and the spread is wide enough that a published figure would mislead you. We assess on site and give one flat written quote covering all of it, with a tank replacement quoted alongside for comparison.
Probably not. The payback on a tankless comes from service life and operating cost over years, and a conversion in McKinney often carries gas and venting work that a tank replacement does not. If you are moving within a couple of years, a properly installed tank is usually the better financial call.