Straight answers from 300+ real San Antonio jobs. Updated July 2026.
A standard tank water heater costs $1,150–$1,900 installed in San Antonio (40–50 gallons, gas or electric, to current code with permit). Tankless conversions run $2,800–$4,500. Repairs, when the tank is still sound, run $149–$389.
The unit itself is only half the bill. A legitimate installed price in San Antonio includes the permit, code-required expansion tank, drain pan, proper venting, haul-away of the old unit, and pressure testing. Quotes that look $400 cheaper usually just leave those out and add them on install day.
Bexar County's hard water is the other budget factor: sediment cuts tank life here to 8–12 years versus the 12–15 you'll read online. Flushing the tank yearly and replacing the anode rod around year 5 genuinely stretches that.
Common San Antonio jobs this covers
40-gal gas or electric tank, installed to code
50-gal tank, installed to code
Power-vent tank (closet/interior installs)
Tankless (replacing a tank, incl. gas/vent upgrades)
Tankless annual descale service
Repair (element, thermostat, gas valve, T&P)
Every job is quoted up front, free, before any work starts.
What affects the job
Location in the home: attic and interior-closet installs need pans, drains, and sometimes power venting; garage installs are the cheapest
Gas vs. electric vs. tankless: tankless needs bigger gas lines and different venting, which is most of its install premium
Code catch-up: if your last install skipped the expansion tank or proper strapping, the new install must add them
Brand/warranty tier: 6-year vs. 10-12-year warranty tanks differ a few hundred dollars; in our hard water the longer anode is usually worth it
Common questions
Is tankless worth it in San Antonio?
For gas homes with 2+ bathrooms that run out of hot water: often yes, endless hot water and 20-year service life offset the install premium. For small electric-only homes, a quality tank is usually the smarter spend. We'll run your actual usage rather than pitch a category.
How long does replacement take?
A like-for-like swap takes 2–3 hours once we're on site, and we install same-day in most cases. Tankless conversions typically take a full day.
My water heater is leaking: repair or replace?
Leak from a valve or fitting: repairable. Leak from the tank body: the tank is done, replacement is the only honest fix. Shut off the cold inlet and the gas/breaker, then call and we'll walk you through it.
Get your free quote
Skip the guessing: call (210) 555-0134 or send the form and a San Antonio plumber will walk you through the job and confirm the scope, free.