Quick answer
A tankless water heater heats water only when you open a tap, so it never runs out and uses less energy than keeping a tank hot all day. Gas tankless units typically last 20 years with yearly descaling. Installation usually requires upgrading the gas line, venting and sometimes electrical service.
Tankless Water Heaters you can count on
Tankless water heaters are one of the most popular upgrades for Dallas–Fort Worth homes, especially for growing families who are tired of cold showers. Wall-mounted units free up the space a tank took up in the garage or closet and can cut water-heating energy use.
Getting tankless right depends on sizing and installation. We calculate the flow rate your household needs, check that your gas line can deliver enough fuel, install proper stainless venting and add isolation valves so the unit can be descaled easily every year.
Signs you need tankless water heaters
- Hot water runs out during back-to-back showers
- Tank water heater is near the end of its life
- You want to free up garage or closet space
- Planning a remodel or adding a bathroom
- Tankless unit shows an error code
- Tankless output is lukewarm or fluctuating
Noticing any of these? Get it checked before it gets worse.
(469) 555-0142How our tankless water heaters service works
- 1
Size the unit
We match the unit to how many fixtures run at once and your incoming water temperature.
- 2
Check gas and venting
We confirm gas pipe sizing and plan the venting route to meet code and manufacturer specs.
- 3
Professional install
Installed with isolation valves, sediment filter and a clean, labeled layout.
- 4
Maintenance plan
Annual descaling keeps the heat exchanger clean, protects the warranty and extends the unit's life.

What affects the cost of tankless water heaters?
Tankless installation costs more upfront than a standard tank because of the unit itself and the gas, venting and electrical work. Your price depends on the model, whether your gas line needs to be upsized and where the unit is mounted. Many homeowners recover part of the difference through lower energy bills and a longer service life.
Tankless Water Heaters in Dallas–Fort Worth: local insight
Because Dallas–Fort Worth water tends to be moderately hard to hard, scale builds up inside tankless heat exchangers. Yearly descaling, or pairing the unit with a water softener, keeps it running at full efficiency and protects the manufacturer's warranty.
Why homeowners choose Mr. Plumber & HVAC
Flat, upfront price
You approve the price before we start. No hourly meter running.
Same-day & 24/7
Live dispatch around the clock for urgent problems.
Licensed in Texas
Licensed, insured, background-checked technicians.
Written guarantee
If it's not right, we come back and make it right.
Tankless Water Heaters near you
We provide tankless water heaters throughout Dallas–Fort Worth, including:
- DallasDallas County
- Fort WorthTarrant County
- PlanoCollin County
- FriscoCollin & Denton Counties
- McKinneyCollin County
- ArlingtonTarrant County
- IrvingDallas County
- GarlandDallas County
- RichardsonDallas & Collin Counties
- AllenCollin County
- CarrolltonDallas, Denton & Collin Counties
- Grand PrairieDallas, Tarrant & Ellis Counties




