Water heater replacement in Texas: cost, types, and when to switch to tankless
Water heaters die quietly until they don't. The day yours fails, you're making a 10-year decision under pressure with a flooded garage. Here's the reasoning a Texas plumber would walk you through if you had time to think about it.
What a new water heater costs in Texas (2026)
Installed prices, including permit, pull-and-haul of the old unit, new pan, expansion tank where required, and standard venting:
- 40-gal electric tank: $1,400–$2,400
- 50-gal gas tank: $1,800–$3,200
- 50-gal heat-pump tank: $2,800–$4,500 (federal IRA rebate may apply)
- Tankless gas (whole-home): $4,000–$7,500
- Tankless electric (point-of-use): $1,200–$2,200
Add $300–$1,500 if your install requires a new gas line, ¾-inch supply upgrade, or attic relocation. Tankless gas in particular often needs a larger gas meter and a longer vent run.
Why Texas water heaters die early
Texas municipal water hardness varies by metro:
- Houston: 250–350 ppm
- Dallas: 130–200 ppm
- Austin: 200–300 ppm
- San Antonio: 250–350 ppm
- El Paso: 250–500 ppm (some of the hardest in the country)
- Lubbock: 200–300 ppm
Hard water builds scale on heating elements and along the bottom of tank water heaters, where it traps heat and cracks the glass lining. Once that lining fails, the tank rusts from the inside and leaks. Annual flushing — drain a few gallons through the bottom drain valve — slows that down considerably.
Tank vs. tankless: the honest tradeoff
Tank water heater
- Cheaper up-front, simpler to install
- Recovers slower — three back-to-back showers will run cold
- 10–12 year lifespan typical (less in hard-water markets)
- Standby heat loss costs $50–$100/year extra on the gas bill
Tankless water heater
- Endless hot water for any single demand at the rated flow
- 15–20 year lifespan
- Needs annual descaling in Texas hard water — skip it and warranty is void
- Higher up-front cost but lower operating cost over its life
- Requires larger gas line and venting in most retrofits
Heat-pump tank water heater
- 2–3× more efficient than electric resistance
- Federal IRA rebate up to $1,750 for income-qualified households
- Needs a conditioned space with adequate ambient air (works well in Texas garages outside winter cold snaps)
- Slight noise from the compressor — not ideal in tight closets
Signs yours is failing now
- Rust-colored water from hot tap only
- Popping or rumbling noise from the tank (sediment buildup)
- Water pooling around the base of the unit
- Water gets hot slower than it used to, or runs out faster
- Unit is over 10 years old (check the date on the manufacturer plate)
What to ask a plumber before signing
- What's the warranty on the tank vs. the labor? (6/8/10/12-year tank options exist; longer warranty often = thicker glass lining)
- Will you pull the city permit and schedule the inspection?
- Is an expansion tank included? (Required by Texas plumbing code in most municipalities)
- Will you install a new pan and drain to outside?
- For tankless: does the gas line need upsizing?
Prevent the next early failure
- Flush the tank annually — 10 minutes, free
- Install a whole-house water softener if hardness exceeds 200 ppm and you're seeing scale
- Replace the anode rod every 4–5 years (sacrificial — protects the tank from corrosion)
- For tankless: descale annually with vinegar or commercial solution