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Water heater repair
in the Bay Area
Two things decide how long a water heater lasts around here, and neither is the brand on the label. The first is water hardness — Bay Area minerals settle into the bottom of a tank and bake onto the heating surfaces until the burner is firing through a layer of rock. The second is whether anyone has ever flushed it. A heater that gets drained once a year routinely outlives one that doesn't by half a decade.
Symptoms
What we see most.
If any of this sounds like your unit, the diagnosis is usually straightforward and the repair is same-visit.
No hot water at all
On a gas heater this is usually the thermocouple, the pilot assembly or the gas control valve — not the tank itself, which is the expensive assumption people arrive at first.
No hot water at all
One of the two heating elements has burned out, or the upper thermostat has failed. A tripped high-limit reset is worth checking before anything is replaced.
Pilot lights then goes out
A weak thermocouple that stops telling the gas valve a flame is present. It's a contained repair and one of the most common calls we take.
Runs out of hot water too fast
Sediment is taking up the space hot water used to occupy, or the lower element on an electric unit has quit and you're running on the top half of the tank.
Rumbling or popping while heating
Water trapped under a sediment layer boiling through it. Harmless-sounding, and it's the clearest warning that a flush is overdue.
Water pooling around the base
Could be a fitting, the T&P valve or the drain — all repairable. If the tank itself has rusted through, it can't be patched, and we'll tell you straight.
Hot water looks rusty or smells
A depleted anode rod. Replacing it is minor work; leaving it means the tank lining goes next, and that ends the heater.
Tankless throwing an error code
Usually scale in the heat exchanger, a flow sensor or ignition. These units self-diagnose well, so we read the code and verify it rather than guessing.
What we service
Tank & tankless — gas and electric.
Storage tank heaters
The standard 40 to 75 gallon gas or electric unit in a garage, closet or basement. Simple, repairable and very sensitive to water quality.
- Thermocouple and pilot assembly repair
- Gas control valve replacement
- Heating element and thermostat swaps
- Anode rod and T&P valve service
Tankless water heaters
On-demand units that heat water as it passes through a heat exchanger. Nothing to corrode, but scale hits them harder and faster than a tank.
- Descaling and flush service
- Flow sensor and igniter repair
- Error code diagnosis
- Venting and combustion air checks
Recirculation & controls
Pumps and timers that keep hot water waiting at the tap instead of running it down the drain.
- Recirculation pump repair
- Timer and controller faults
- Thermostatic valve service
- Expansion tank inspection
Common causes
Why it breaks down.
Sediment builds up from hard water
Minerals drop out of the water and settle on the tank floor. On a gas heater the burner then has to fire through that layer, which wastes fuel and overheats the steel above it.
The anode rod gets used up
That rod exists to corrode instead of the tank. Once it's gone the tank lining is next, and a rusted-through tank is a replacement, not a repair.
Thermocouples are wear parts
They sit in a flame their whole life and eventually stop generating enough signal to hold the gas valve open. Common, cheap and fixable.
Heating elements scale over
On electric units minerals coat the elements until they overheat and fail. The same hard water that fills a tank with sediment does this.
Tankless heat exchangers scale faster than tanks
There's no reservoir to hide deposits in — everything lands in a narrow passage. Skipping the annual descale is what kills these units early.
Age catches up around year twelve
A standard tank is engineered for roughly ten to fifteen years. Past that, a failure is usually the end of the equipment rather than a fault worth chasing.
Care tips
Keep it running longer.
- Flush the tank once a yearThe single highest-value thing on this list in a hard-water area. Draining a few gallons off the bottom clears sediment before it bakes on.
- Have the anode rod checked around year fiveA rod is a modest part. The tank it protects is not. Checking it midlife is what turns a ten-year heater into a fifteen-year one.
- Set the thermostat to 120°FHot enough for the house, cool enough to slow scale and cut standby loss — and it's the temperature that stops a tap from scalding.
- Test the T&P valve yearlyLift the lever, let it discharge briefly, let it snap back. It is the safety device on a pressurised tank of very hot water and it should not be ignored.
- Check the seismic strapsCalifornia requires water heaters to be strapped against earthquakes, upper and lower third of the tank. We check them on every visit and tell you if they're missing or loose.
- Descale a tankless unit annuallyNot optional maintenance on these. A yearly descale is the difference between a long service life and an early error code.
Pricing
Priced after diagnosis, not before.
Parts and labor for water heater repair vary too much by brand and fault to publish a flat rate honestly. A technician diagnoses the issue on site and gives you the exact price in writing — nothing starts until you approve it, and the diagnostic fee is applied to the repair.
Brands we service
Rheem, A.O. Smith, Bradford White, State, Navien, Rinnai, Noritz, Takagi, Bosch, American Standard
Service area
Water heater repair across the Bay Area.
Same technicians, same warranty, same pricing rules, from San Francisco down to the South Bay and out to Marin. Pick your city for local response times and what we see most in your neighborhood.
Questions
Before you call.
My pilot light keeps going out. Is the heater finished?
Almost certainly not. That symptom points at the thermocouple far more often than anything else — it's the sensor that tells the gas valve a flame is present, and when it weakens the valve shuts the gas off. That's the safety system doing its job on bad information, and it's a contained repair.
Is a leaking water heater always a replacement?
No, and it's worth finding out which kind of leak you have before spending anything. Fittings, the drain valve and the T&P valve all leak and all get repaired. A tank that has rusted through is a different matter — that one can't be patched, and we'll say so plainly rather than sell you a repair that won't hold.
Why does my water heater make a rumbling noise?
Water boiling underneath a layer of sediment on the tank floor. It's the clearest signal you'll get that a flush is overdue, and it's worth acting on — that sediment is also making the burner work harder and overheating the steel above it.
How often should a tankless unit be descaled?
Once a year in this area, and that's a real requirement rather than an upsell. Tankless units have no reservoir to hide mineral deposits in, so scale lands directly in the heat exchanger and output drops off from there.
Are earthquake straps really required in California?
Yes — state code calls for the tank to be strapped in the upper and lower third. It's frequently missing on older installs and on heaters swapped out in a hurry. We check it on every visit and flag it, because it's both a safety matter and something an inspector or insurer will look for.
When does replacing beat repairing?
Roughly at year twelve on a standard tank, or whenever the tank itself has corroded through. Under that age, most failures are a thermocouple, an element, a thermostat or a valve, and repair wins comfortably. We'll give you the honest arithmetic rather than defaulting to the bigger job.
Book a technician
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