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- Mesquite Chamber of Commerce Member
- 30+ Years Experience
Tankless Water Heaters in Garland, TX
Running out of hot water is a solvable problem. A tankless water heater warms water the moment you call for it instead of storing forty gallons and reheating them all day.
For Garland families with back-to-back showers, a full laundry schedule, and a dishwasher that never rests, going tankless usually means two things: hot water that does not quit, and a lower gas or electric bill.
James Armstrong Plumbing installs, repairs, and maintains tankless water heaters across Garland.
Call 214-918-6109 for straight answers and a firm quote.
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 Garland Homeowners Call Us for Tankless Work
Licensed & Certified Technicians
Tankless installs live or die on gas sizing and venting. James Armstrong holds the highest plumbing license Texas issues, and that is exactly the job it exists for.
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
Same story in review after review: on time, on quote, fixed once.
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.
Most installations in the Dallas-Fort Worth area run $2,500 to $6,500 including equipment and labor. Simple swaps can come in lower. Gas line upsizing or new venting adds to the total, and we price all of it in a firm written quote before any work starts.
Gas units deliver more hot water at once and recover faster, which suits most families here. Electric units fit smaller households and homes without a convenient gas supply. We quote both when the choice is genuinely close.
Most installs finish in a single day. Add time when the job includes a gas line upgrade or a new venting run, and you will know that before we start, not after.
For typical households, ENERGY STAR rates tankless units up to about 34 percent more efficient than standard tanks, because nothing is kept hot while you sleep or work. Your actual savings depend on how much hot water you use.
Add up the fixtures you realistically run at once, using the flow table above. Two showers and a sink is roughly 6 GPM. We confirm the math during the estimate and factor in colder winter groundwater, which trims every unit's real-world output.
Once a year. Our hard water scales heat exchangers faster than most of the country, and annual descaling protects both performance and your manufacturer warranty.
Most error codes, ignition problems, and flow issues are repairable, especially when caught early. Heavy internal scaling on an older unit is where replacement starts making more financial sense. We give you both numbers and let you decide.
Yes, with a caution. Built-in freeze protection requires electricity, so an extended power outage in a hard freeze can damage the unit. We walk you through the drain-down procedure at installation so you can protect it in a storm.
Often, yes. Tankless units demand more gas at peak than the tank they replace, and an undersized line is the most common defect we find in previous installs. We verify your line and meter capacity as part of every estimate.
Yes. Tankless installation is permitted work with a city inspection, and we handle both as part of the job.
We service all major tankless brands and stock common parts. On new installs, we recommend units with strong local parts availability and warranty support, and we will explain the choice for your specific home.
Yes. James Armstrong holds Texas Master Plumber license M-39428 with a gas endorsement, and we carry full insurance on every job.
Comparison
Tankless vs Tank: The Honest Comparison
| Factor | Tankless | Traditional Tank |
|---|---|---|
| Hot water supply | Continuous, does not run out | Limited to tank capacity |
| Energy use | Heats only on demand | Reheats stored water all day |
| Typical lifespan | 20 or more years with maintenance | 8 to 12 years |
| Upfront cost | Higher | Lower |
| Space needed | Wall-mounted, frees a closet | Full closet or garage corner |
| Flood risk | No stored water to dump | 40 to 50 gallons if the tank fails |
| Maintenance | Annual descaling in our hard water | Annual flush recommended |
| Best fit | Larger households, long-term owners | Tight budgets, low hot water use |
Tankless is not automatically the answer. A small household with modest hot water use may never recoup the higher install cost, and we will say so during the estimate rather than sell you the bigger ticket.
What Size Tankless Unit Does Your Home Need?
Sizing is where DIY and low-bid installs go wrong. A unit that is too small delivers lukewarm water the moment two fixtures run at once. Add up your realistic peak demand:
| Fixture | Typical Flow |
|---|---|
| Shower | 2.0 to 2.5 GPM |
| Kitchen sink | 1.5 GPM |
| Bathroom sink | 1.0 GPM |
| Dishwasher | 1.5 GPM |
| Washing machine | 2.0 GPM |
Two showers plus a kitchen sink at the same time is roughly 6 GPM, which calls for a properly sized gas unit, not the small model on sale. We run this math with you during the estimate, along with the winter factor: incoming water is colder in January, which lowers every unit’s real output exactly when you want hot showers most.