No hot water or not enough? O5 Plumbing diagnoses and repairs water heaters fast. Tank and tankless, gas and electric. When repair isn't the answer, we install quality replacements with upfront pricing and same-day service when available.
Most water heater failures don't happen without warning. The unit usually shows signs weeks or months before it completely fails inconsistent hot water, longer recovery times, strange noises, discolored water, or visible rust on the unit or connections. Catching these early makes the difference between a planned repair and an emergency replacement with standing water in your utility room.
San Antonio's hard water is especially hard on water heaters. The high mineral content causes accelerated scale buildup on heating elements and inside the tank, reducing efficiency and shortening service life. Annual flushing significantly extends heater life most San Antonio homeowners don't do it and end up replacing units 3-5 years earlier than necessary.
Failed heating element, burned-out pilot, bad thermocouple, or a tripped reset. We diagnose which component failed and whether it's worth repairing.
Mineral sediment settled at the bottom of the tank gets heated and pops. It reduces efficiency and stresses the tank the unit should be flushed or replaced.
Rusty water from hot taps means the inside of the tank is corroding a clear sign the unit is near the end of its service life.
Leaks from the pressure relief valve, drain valve, or the tank body itself all require prompt attention. A leaking tank will not fix itself.
Honest Work Quality Materials Fair Pricing
Repair when it makes sense. Replacement when it doesn't. Honest advice either way.
Heating element replacement, thermostat repair, pilot light service, anode rod replacement, pressure relief valve testing, and sediment flushing. Most repairs extend unit life by 3-5 years and cost a fraction of replacement.
When a unit is rusted out, leaking from the tank body, or simply too old to repair economically, we supply and install a quality replacement properly sized for your household, correctly vented, and code-compliant. Ask about current offers.
Tankless unit descaling (critical in San Antonio's hard water), igniter service, flow sensor repair, and full replacement. We also handle new tankless installations for homeowners upgrading from tank units for energy savings and endless hot water.
The T&P (temperature and pressure) relief valve is a critical safety device. If yours is leaking, corroded, or hasn't been tested in years, we test, reset, or replace it. This is not a component to defer.
San Antonio's hard water deposits significant sediment in tank heaters over time. Annual flushing improves efficiency, reduces noise, and extends tank life. We also inspect the anode rod and connections during maintenance service.
Adding a second water heater, upgrading to a larger unit, or installing a point-of-use heater for a remote bathroom or addition we handle new installations with proper permits, correct venting, and code-compliant connections.
Both are solid options. The right choice depends on your household size, budget, and hot water usage patterns.
Some plumbers push replacement on everything. We look at what's actually wrong, explain the repair path vs. replacement path, and let you make the call. If a smaller repair can extend the life of a unit in good shape, that's what we'll recommend. If the unit is rusted out and past its service life, we'll tell you that too.
Call Now Ask About Current OffersRepair vs. replace advice based on the unit's actual condition not what makes us more money.
After we assess the issue, you approve the scope and quote before work begins. No billing surprises on parts or labor.
Cold water is an emergency. We move quickly and keep replacement units in stock.
TX Master Plumber Lic # M44165. Accountability on every job.
"Our 12-year-old water heater finally quit. Called O5 at 8am and had hot water back by 3pm the same day. New unit, properly installed, the current offer exactly as advertised. The tech explained what failed in the old unit and what to watch for going forward. Couldn't ask for better service."
"I expected to need a full replacement O5 came out, diagnosed a failed heating element, replaced it in under an hour, and the unit has worked perfectly since. They could have sold me a new heater but didn't. That honesty matters to me. These are my plumbers."
"Had O5 install a tankless unit to replace our old 40-gallon tank. The tech walked me through the options, sized it correctly for our family, and handled the gas line upgrade needed. Installation was clean and professional. Energy bill is noticeably lower three months in."
Straight answers about repair, replacement, and maintenance.
Tank water heaters typically last 8-12 years in San Antonio. The city's hard water among the hardest in Texas deposits mineral scale that degrades heating elements and corrodes tanks faster than in soft-water markets. With annual flushing and anode rod replacement every 3-5 years, you can push that to 12-15 years. Tankless units last 15-20 years with proper annual descaling maintenance.
Yes. Turn off the cold water supply to the heater (the valve on the cold inlet line) and turn off power to the unit either the circuit breaker for electric, or the gas valve for gas heaters. Then call us. Where the leak is coming from matters: the pressure relief valve, the drain valve, and the tank body itself all indicate different problems with different solutions. Don't let a leaking heater sit water damage accumulates quickly.
A good rule of thumb: if the unit is under 8 years old and the repair cost is less than 50% of replacement cost, repair makes sense. If the tank is leaking from the body (internal corrosion), replacement is always the answer that cannot be repaired. If the unit is over 1012 years old, a repair may extend its life only a year or two before the next component fails. We give you honest numbers for both options and let you decide.
Sediment buildup at the bottom of the tank is the most common culprit. As mineral scale accumulates, it insulates the water from the heating element, reducing the effective capacity of the tank and extending recovery time. A sediment flush often restores normal performance. A failed lower heating element (on electric units) also dramatically reduces capacity only the upper element heats, giving you a fraction of normal hot water.
For many San Antonio households, yes especially larger families or homes that frequently run out of hot water. Tankless units run 20-30% more efficiently and last significantly longer. The higher upfront cost is often recovered over time through energy savings. The key requirement in San Antonio is annual descaling due to hard water skip this and you'll significantly shorten the unit's life.
Call O5 Plumbing for same-day water heater repair and replacement. Ask about current offers and financing this month.
(830) 293-4141Serving the greater San Antonio metro area and surrounding communities.
