Diagnosis Before Any Major Work
We verify the failure point (valves, burner or ignition, thermostat, elements, heat exchanger, venting or controls) so you're not paying for guesswork.
Residential Repair Service
Water Heater Repair San Francisco
No hot water, a leak or a rumbling tank? Get a clear diagnosis and a lasting repair before a small fault gets worse.
- Tank and tankless diagnostics
- Gas and electric equipment
- Leaks, pilots and no-hot-water calls
San Francisco Water Heater Repair
When hot water stops, you need two things: hot water back on and reassurance that a small issue isn't turning into a bigger one. We repair common tank and tankless failures, including leaks, pilot or ignition faults, temperature swings, popping noises and low hot-water output.
Older homes often hide the heater in a tight closet, basement or under-stair space where access and ventilation matter. In multi-unit buildings, shared shutoffs and small mechanical rooms change how a repair is planned, and garage installs, common in the Sunset and Richmond, bring their own venting and drain checks.
If your heater is actively leaking, shut off the cold water supply to the unit and avoid using hot water until it's inspected.
Repair Standards
What You Get With Every Repair Visit
Clear Options When Repair vs. Replacement Is the Question
Some breakdowns are worth fixing and others aren't. We explain the risk, parts availability and what to watch for next.
Safety Checks That Match the Equipment
Gas units get combustion and venting checks, electric units get wiring and element checks, and tankless units get error-code and flow checks.
Care in Tight Spaces
Many calls involve narrow hallways, stacked laundry areas or small mechanical closets. We come prepared to work cleanly and carefully.
Urgent Calls First
When hot water is out, timing matters. We prioritize no-hot-water and active-leak calls whenever possible.
Problems We Fix on Tank and Tankless Units
Most of the calls we get are for water heater repair. San Francisco CA homes with older plumbing tend to show the same handful of faults, and getting the category right sets expectations for parts, timing and whether the problem will come back.
On tank heaters, frequent issues include failed thermostats or heating elements (electric), pilot or thermocouple problems (gas), a failing gas control valve, a leaking temperature and pressure relief (TPR) valve, a dripping drain valve and noise from sediment. If the tank itself leaks from the seam or body, repair is rarely the long-term answer.
On tankless units, we often see ignition or flame-sensing problems, flow sensor faults, scale in the heat exchanger, venting or intake faults, and error codes tied to gas supply or condensate drainage. A proper tankless repair confirms flow and temperature rise at real faucets and showers, not just a cleared error code.
Whatever the style, we look at the installation around it: shutoffs that actually work, expansion control where needed, safe discharge piping for the relief valve and sound venting on gas units. Many heaters have been swapped several times over the decades, and small shortcuts add up.
From Triage to Verification
How a Repair Visit Works
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01
Quick Triage and Safety Check
We check for active leaking, gas odor or electrical issues, then make the unit safe while we inspect.
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02
Pinpoint the Failure
We test the parts that match your symptoms: heat source (burner, igniter, elements), controls (thermostat, gas valve, board) and water-side parts (valves, dip tube, heat exchanger flow).
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03
Explain Repair Options in Plain Language
You get a clear scope: what we recommend, what it costs, what the repair changes and any red flags that could affect reliability.
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04
Complete the Repair and Verify Performance
After the fix, we confirm stable temperature at fixtures, proper cycling and no leaks at fittings, valves or condensate connections.
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05
Leave You With Next Steps
We share simple maintenance tips and the symptoms that should prompt another check, especially on older units.
Planning Your Repair
What Repairs Usually Cost
Most repairs run about $250 to $900. Simple valve, thermostat or element jobs usually land between $250 and $450, while gas controls, tankless diagnostics or venting corrections run toward the $900 end.
Price depends on heater type, the failed part, access in tight closets or garages and whether other worn parts show up during testing. We confirm pricing after diagnosing your unit.
Common Questions
Repair Questions We Hear Often
Is a leaking water heater always repairable?
No. Leaks from fittings, valves or the TPR discharge can often be repaired, but a tank leaking through the body or bottom seam has usually failed. If water is pooling at the base, shut off the cold supply to the unit and call us.
What causes rumbling, popping or banging noises?
On tank heaters, those sounds usually come from sediment at the bottom of the tank trapping and releasing steam bubbles as the burner heats. The fix may involve flushing, checking the anode and drain valve, and confirming the thermostat setting. On an older, corroded tank, noise can mean it's near the end of its life.
Why does my hot water run out faster than it used to?
On a tank, it can point to a failing dip tube, a thermostat or element problem, or heavy sediment taking up space. A tankless unit may be restricted by scale, have a flow sensor fault or be undersized. We measure temperature at fixtures and check recovery, not just the display.
Can you repair both gas and electric water heaters?
Yes. Gas repairs often involve ignition, burner operation, gas control valves and venting, while electric repairs focus on elements, thermostats, wiring and breakers. On both, we also check shutoffs, expansion control and leak points.
Do you work on tankless water heaters?
Yes. Tankless repairs include troubleshooting error codes, checking gas supply and airflow, cleaning inlet screens, clearing scale from the heat exchanger and checking condensate drainage on condensing models.
When does it make more sense to replace instead of repair?
Usually when the tank is leaking, when a major part fails on an older unit with other worn parts, or when the repair cost approaches the price of a new setup. Comparing the repair with a full San Francisco water heater replacement shows what you'd gain in reliability and corrected installation details.
Service Area
We work in homes throughout the city.
No Hot Water This Morning?
Tell us what your water heater is doing and where it's located. We'll set up a visit and give you a clear repair plan once we've diagnosed it.