Water Heater Repair in Union City & the Bay Area
Lost your hot water, or found a puddle under the tank? We diagnose and repair gas, electric and tankless water heaters, usually the same day. You get the fault explained and the price agreed before any work starts, and there is never an overtime charge for evenings, weekends or holidays.
Replacing rather than repairing? See water heater installation and replacement.
- No hot water, or hot water that runs out far too soon
- Leaks from the tank, fittings, valves and connections
- Pilot, thermocouple, igniter and gas control valve faults
- Electric elements, thermostats and tripped high-limit cut-outs
- Rumbling, popping and sediment build-up from hard water
- Rusty or discoloured hot water
- Emergency same-day repair, 24 hours a day
Signs Your Water Heater Needs Attention
Catching these early is almost always cheaper than waiting for the failure.
No hot water at all
On gas, this usually points to a pilot that has gone out, a failed thermocouple or thermopile, or a gas control valve that has given up. On electric, it is normally a burnt-out element, a failed thermostat or a tripped high-limit cut-out. All are testable in minutes.
Hot water runs out early
If a shower that used to be comfortable now goes cold halfway through, the likely causes are a broken dip tube, a lower element that has failed while the upper one still works, or a thick sediment bed stealing capacity from the bottom of the tank.
Water pooling under the unit
Not every puddle means the tank has gone. It can be a weeping relief valve, a leaking drain valve, a loose union or condensation on a cold day. What matters is telling those apart quickly, because a genuine tank leak only ever gets worse.
Rumbling, popping or kettling
That noise is water flashing to steam underneath a layer of hardened sediment. Bay Area water is hard, so scale builds steadily. It makes the heater work longer for the same hot water and puts heat stress on the bottom of the tank.
Rusty or discoloured hot water
If only the hot side is discoloured, suspect a spent anode rod or corrosion starting inside the tank. If cold water is affected too, the problem is more likely in the supply pipework, which matters in older homes still running original galvanised pipe.
Pilot will not stay lit
A pilot that lights then dies within seconds is the classic thermocouple or thermopile fault. Repeated outages can also mean a blocked flue, a dirty burner or poor draught. Because it involves gas and combustion, this one is worth checking properly rather than relighting again.
Gas, Electric and Tankless — Different Failures
The symptoms look similar from the outside. What has actually failed is not.
Gas water heaters
Faults cluster around the combustion side: thermocouple or thermopile, pilot assembly, igniter, burner, gas control valve and flue draught. We also check the temperature and pressure relief valve, the discharge pipe and the seismic straps, because those are the parts that cause real damage when they are wrong.
Electric water heaters
Two elements and two thermostats do the work, plus a high-limit cut-out that trips when something goes wrong. Lukewarm water usually means the lower element, no hot water at all usually means the upper one or the reset. Elements scale up quickly in hard water, which shortens their life.
Tankless water heaters
Tankless units log error codes, which speeds diagnosis considerably. The common culprits are scale in the heat exchanger, a dirty inlet filter, a flow sensor that has stopped reading, ignition faults, and venting or gas supply that cannot keep up when more than one outlet runs.
How We Repair a Water Heater
Find out what actually failed
We test rather than guess: gas pressure and thermocouple output, element and thermostat continuity, or the stored error code on a tankless unit. Knowing the real fault is what stops you paying for a part that was never the problem in the first place.
Safety checks before anything else
On gas units we check for leaks at the connections, look at flue draught and combustion clearances, and confirm the relief valve and its discharge pipe are correct. We also check the seismic strapping, which California requires on tank water heaters.
Quote before we start
You get the parts, the labour and any code corrections laid out and approved before we touch anything. If the honest answer is that the unit is not worth repairing, we will tell you that instead of selling you a repair that buys a few weeks.
Repair, refill and test
We fit the parts, purge air from the system, bring the unit back up to temperature and check recovery at the taps. On gas we confirm a clean burner flame and proper draught before we leave, not just that hot water has come back.
Tell you where you stand
Before we go, you get a straight view of the condition of the rest of the unit: sediment load, anode condition, valve condition and what to watch. That way the next decision is planned rather than made in a hurry with a flooded garage.
Water Heater Repair in Bay Area Homes
Water across much of the East Bay and South Bay is hard, and hard water is what quietly kills water heaters here. Dissolved minerals drop out as scale every time the water is heated, forming a crust on the bottom of a tank or inside the heat exchanger of a tankless unit. That layer insulates the burner from the water, so the metal above it runs hotter than it was designed to. Rumbling, slower recovery and premature failure all trace back to it.
The second common thread is location. Bay Area heaters live in garages, tight closets, crawl spaces and side returns, often installed years apart from the rest of the plumbing. Access dictates how a repair goes, and older installations frequently need small corrections at the same time: proper seismic straps, a relief valve discharge that actually terminates safely, or a drain pan under a unit sitting above living space.
Not every water heater fault is worth repairing, and we will say so. A failed thermocouple, element, thermostat, dip tube or gas valve is a sensible repair on a sound tank. A tank that is leaking from the shell is not repairable at any price, because the steel has corroded through from the inside. Check the rating plate for the date of manufacture and the warranty term, and weigh a repair against that before spending.
When there is no hot water, or worse, water on the floor, speed matters. We run 24/7 including holidays with no overtime charges, we target a 30-minute response and average around 15 minutes to reply. If you can send photos of the unit and its rating plate, we can often tell you what the fault is likely to be, and what it will take to fix, before we arrive.
What Affects the Price
We quote every job up front, so you approve the price before anything starts. These are the things that move it:
- Which part has failed — a thermocouple is a very different job to a gas control valve
- Gas, electric or tankless, and how much of the unit has to come apart
- Where the heater sits: garage, closet, attic, roof or crawl space
- Whether the tank itself is leaking, in which case repair is off the table
- How much sediment has built up and whether a full flush is needed
- Parts availability on older or discontinued models
- Any code corrections needed at the same time, such as seismic straps, a drain pan, relief valve discharge or an expansion tank
Most quotes are free and can be done from photos or video you send us. Some on-site estimates carry a fee based on distance, and we tell you that before we come out.
Maintenance That Actually Helps
Draining a few gallons off the bottom carries out loose sediment before it hardens. In hard water areas this is the single most useful thing you can do, and it keeps recovery time and running noise where they should be.
The anode corrodes so the tank does not. Once it is spent, the steel is next. Checking it periodically, and replacing it while the tank is still sound, is what separates heaters that last from heaters that leak.
Lift the lever on the temperature and pressure relief valve briefly and let it snap shut. It should discharge and then seal. A valve that weeps afterwards, or one that never moves, needs replacing — it is the last line of defence.
We sit close to the Hayward Fault, and California requires tank water heaters to be strapped. Make sure both straps are present, tight and anchored into structure, not just drywall, and that the gas connector is not under strain.
Tankless heat exchangers scale up in hard water, and scale shows first as fluctuating temperature or error codes. A periodic descale, plus cleaning the inlet screen, keeps the unit at full output and prevents avoidable component failures.
Water Heater Repair — Frequently Asked Questions
Straight answers, without the sales pitch.
My water heater is leaking. Can it be repaired?
It depends where from. Leaks at the drain valve, relief valve, unions, nipples or the cold and hot connections are all repairable, and often cheap to fix. A leak from the body of the tank itself is not repairable — the steel has corroded from the inside out and the only fix is replacement. First job is to work out which one you have.
How fast can you get to a no hot water call?
We run 24/7 including holidays, we target a 30-minute response and our average reply is around 15 minutes. Most no hot water calls in our service area are handled the same day. Send a photo of the unit and its rating plate when you call and we can usually narrow the fault down before we arrive.
Why does my water heater rumble and pop?
Sediment. Hard Bay Area water leaves mineral scale on the bottom of the tank, and water trapped underneath it boils and escapes as steam bubbles, which is the popping you hear. It is a sign the heater is working harder than it should be. A flush usually helps, though heavy long-standing build-up may not clear completely.
How do I know whether to repair or replace?
Look at three things: the date on the rating plate, what has failed, and whether the tank is sound. Valves, elements, thermostats, dip tubes and igniters are sensible repairs. Repeated failures, a badly scaled tank or any leak from the tank body point to replacement. We give you the honest read and you decide.
My tankless unit is showing an error code. Can you fix it?
Usually, yes. Error codes are helpful — they point at ignition, flow, venting, gas supply or over-temperature conditions rather than leaving us guessing. Common repairs are descaling the heat exchanger, cleaning the inlet filter, replacing a flow sensor or igniter, and correcting a gas or venting issue that leaves the unit short of what it needs.
The hot water looks rusty. Is that the heater?
If only the hot side is affected, it usually is: a spent anode rod, or corrosion inside the tank. If the cold side is discoloured too, the pipework is the more likely source, which is common in Bay Area homes still running original galvanised supply pipe from before the 1960s. We test both sides to tell them apart.
Do you charge extra for nights, weekends or holidays?
No. We do not add overtime charges, ever. The rate you are quoted is the same whether we come out on a Tuesday morning or at 2am on a holiday weekend.
Are you licensed and insured?
Yes. Power Plumbing USA holds California contractor license #1082507 and carries full liability insurance. All work is performed to California Plumbing Code, and we pull permits where the job requires them.
Where We Provide This Service
We cover 15 Bay Area cities from our Union City base. See the full service area →