Service Brief
Tankless Water
Heater Install
Tankless heaters deliver endless hot water in a fraction of the space — when they're sized, gas-fed, and installed correctly. S.W.A.T. Plumbing handles the install the right way: load calc, gas line resizing, vent path, and city sign-off.
BBBA+ · Since 2014- TX Master PlumberLicense#M-39596
- Family-OwnedFoundedServing North Texas Since 2013
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When You Need This
The longer you wait,
the worse it gets.
A tankless water heater isn't a drop-in replacement for a tank — it's a different system. The flow rate has to match your fixture demand, the gas line usually needs upsizing to feed the higher BTU input, the venting has to be approved for the unit, and the permit and inspection are non-negotiable. S.W.A.T. Plumbing handles the full install: load calculation, gas sizing, venting, condensate management, water treatment recommendations, and Atmos coordination when needed.
Warning Signs
- Tank heater leaking, rusting, or at end-of-life (10+ years)
- Running out of hot water during back-to-back showers or peak use
- Wanting to free up garage or utility-closet space
- Considering a tankless upgrade to lower long-term operating cost
- Existing tankless unit error code or no-hot-water condition
- Tankless needs annual descaling and hasn't been serviced
- Adding a primary bath or remodel that increases hot-water demand
- Solar-thermal pre-heat integration with a tankless backup
Mission Operations
How we execute
from call to close.
- 01.
Size
Match BTU to Demand.
We calculate your peak hot-water demand — bathrooms, kitchen, laundry, simultaneous use patterns — and match a tankless unit's GPM and BTU output. Undersized tankless heaters disappoint. Oversized ones waste money. We get the spec right before ordering.
- 02.
Plan
Gas, Vent, Water, Power.
Most tankless installs require gas line resizing — a 199,000 BTU unit needs a 3/4-inch or 1-inch run, not 1/2-inch. Venting (Category III/IV stainless, concentric, or PVC depending on unit) and condensate management are planned. We confirm electrical and recommend a softener if water hardness warrants it.
- 03.
Install
Permitted. Mounted. Connected.
We pull the permit, remove the old tank (or rough-in for new construction), mount the tankless unit, run new gas, install vent path, connect water supplies, electrical, condensate drain, and any required isolation valves for service flushing. Installs typically complete in one day.
- 04.
Commission + Inspect
Started, Tested, Signed Off.
Unit is commissioned per manufacturer spec — gas pressure verified, temperature setpoints confirmed, flow rate tested at multiple fixtures. City inspector signs the permit. You receive the manufacturer warranty registration, install documentation, and a walkthrough of annual maintenance.
Scope of Service
What’s included
in this service.
Every dispatch is fully equipped. Here’s what we cover under Tankless Water Heaters.
- Tankless water heater installation (whole-house gas)
- Tank-to-tankless conversion
- Tankless replacement (existing unit failure or upgrade)
- Gas line upsizing for tankless BTU demand
- Concentric, Category III/IV, and PVC venting installation
- Condensate management and neutralizer installation
- Annual descaling service (vinegar or descaler flush)
- Error-code diagnosis and repair
- Recirculation loop installation (instant-hot integration)
- Outdoor and point-of-use tankless installations
Why S.W.A.T.
Built different.
For this exact problem.
Brand-Agnostic Install.
- Rinnai, Navien, Rheem, Noritz, Bosch — all installed to spec
- Brand recommendation based on demand profile and warranty terms
- No installer rebates pushing one brand over another
Right-Sized Gas Line.
- Load calc against full home appliance demand
- 3/4-inch and 1-inch upsizing handled in-house
- CSST, black iron, or polyethylene routed and code-compliant
Annual Maintenance Included.
- First-year descaling and inspection included on new installs
- Annual service plan locks in maintenance pricing
- Hard-water area? Softener recommendation comes free
Verified Reviews
Real homes.
Real results.
S.W.A.T. Plumbing has dispatched to thousands of tankless water heaterscalls across North Texas. Here's what it actually sounds like.
“My A/C was leaking because of a backup in the main drain pipe. The tech Tyler was beyond communicative, patient, and tenacious to fix this. He stayed until almost 6p troubleshooting and sticking with the plan of action that freed the issue. Great guy and great service. As a bonus, I requested the soonest available service and when there was a cancellation that pulled my appointment forward by one day. One earlier day with A/C in Mya in Texas. Win! I was provided them through my home warranty service. I will definitely request them again. Tyler was the man!”
Marcus Combs5 months ago“Very professional. They installed a faucet that out of the box had a leak. No fault of theirs. Came out 1st thing next morning and replaced and tested it. All good. Thanks.”
Bryan Frye2 weeks ago“Gerald was awesome. Prompt service. Polite. Wore booties upon entering. Explained the repairs. Great work and would highly reccomend swat plumbing after his Great service. Please recognize this tech because he’s an asset for your company. Top notch !”
Jon Gmur2 months ago
Common Questions
Answered before
you have to ask.
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Need Tankless Water Heaters
right now?
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Last updated: June 2026