When you need water heater repair in San Antonio, TX, Zeus Plumbing is the call. We repair and replace tank and tankless water heaters — gas and electric — across the area. Cold water, a pilot that won't stay lit, a leaking tank: we diagnose the problem the same day and give you written pricing before any work begins.
No hot water is a same-day problem. Same-day scheduling is available, and emergency texts to 210-698-5003 are answered around the clock. Most repairs are done in one visit — and when replacement is smarter, we can usually do it the same day.
Water heater repair services in San Antonio
- Tank water heater repair (gas and electric)
- Tankless water heater repair and descaling
- Water heater replacement and new installs
- Thermostat, element and thermocouple replacement
- Gas valve, pilot assembly and igniter service
- Anode rod inspection and replacement
- Expansion tank installation and replacement
- T&P relief valve repair
- Water heater flushing and sediment removal
- Code-compliant venting, pans and drain setup
What does water heater replacement cost? · What does a tankless water heater cost?
Every visit starts with a full diagnosis, followed by written pricing before work begins.
Repair or replace? Making the right call
Most tank problems are repairable: a failed thermostat or element, a bad gas valve or thermocouple, a dripping drain valve or a worn T&P relief valve. If the tank isn't leaking and the unit is in the first half of its expected life, repair is the smart money — one visit for a fraction of replacement cost.
Tankless units fail differently: igniters, flow sensors, control boards and gas supply issues cause most no-heat calls, and descaling restores a mineral-clogged heat exchanger. Tankless heaters are worth repairing more often than tanks — but in San Antonio's hard water, skipping descaling kills them early.
A tank leaking from the body cannot be repaired — replacement is the only option. Other signals: rust at the base, rust-colored hot water, age past about 10 years, or rumbling sediment. San Antonio's limestone-aquifer water is hard on heaters: scale burns out elements, sediment overworks the tank, and corrosion eats anode rods fast.
Water heater FAQ
When is water heater repair in San Antonio worth it — and when is replacement smarter?
Repair when the tank itself is sound and the failed part is replaceable — thermostat, element, gas valve, thermocouple or igniter. Replace when the tank leaks, the base shows rust, or the unit is past its expected life. A tank leaking from the body can't be repaired.
How long does a water heater last in San Antonio's hard water?
Tank heaters that last 10 to 12 years elsewhere fail sooner here: scale coats elements and sediment overheats the tank bottom. Annual flushing and anode rod checks add years. Tankless units can last 15 to 20 years — but only with scheduled descaling; skip it and hard water chokes the heat exchanger.
Is a tankless water heater worth it?
For many households, yes: continuous hot water and less standby energy loss than a tank reheating all day. Tradeoffs: higher upfront cost and strict descaling in San Antonio's hard water. We can size either option for your home and show you written pricing first.
My water heater is leaking — what should I do right now?
If it's safe, shut off the cold-water feed and turn the thermostat down or off — gas to pilot, electric at the breaker. Then call or text 210-698-5003. A tank leaking from the body can't be repaired, but we can usually replace it the same day.
Need water heater repair in San Antonio?
Same-day scheduling is available. Call now or request service online and our team will confirm your window.
Request service online · Emergency texts answered 24/7/365
Want an estimate first? Email pictures or a short video of the problem to service@zeusplumbing.com — we can often provide an estimate without an in-person trip.