No hot water: what is usually wrong
No hot water is the most common call we take, and the cause depends on the fuel. On a gas tank, a pilot that will not stay lit often points to a worn thermocouple. On an electric tank, a tripped breaker or a failed heating element is the usual culprit.
We start at the controls and work toward the tank, testing before we replace anything. A part that costs little but is diagnosed correctly beats a tank that gets replaced for the wrong reason.
| Symptom | Likely cause | Typical next step |
|---|---|---|
| Cold water only, gas unit | Thermocouple, gas valve or pilot assembly | Test and replace the failed part |
| Lukewarm water, electric unit | Failed lower or upper element or a bad thermostat | Meter the elements and swap the bad one |
| Hot water runs out fast | Sediment buildup or a broken dip tube | Flush the tank and inspect the dip tube |
| Rumbling or popping | Sediment hardened on the tank floor | Flush now, or plan replacement if the tank is old |
| Water around the base | Leaking fitting, relief valve or the tank itself | Tighten or replace the fitting, or replace the tank |
When a leaking tank is an emergency
Water pooling under the heater changes the call from repair to urgent. A leaking fitting or relief valve can be fixed the same day. A tank that leaks through its shell cannot be patched, because the steel liner has failed, and the answer becomes water heater replacement.
We tell you which it is before any work starts. If the leak is at the tank, we can set up a temporary shutoff so you keep cold water to the rest of the house, and we schedule the replacement, often the same day when stock and a crew allow.
Cold water valve
Turn the handle on the cold supply pipe above the heater clockwise until it stops.
Power or gas
Set electric units to off at the breaker. Set a gas control to pilot and never relight a unit sitting in water.
Open one hot tap
Opening a hot faucet upstairs breaks the vacuum and lets the tank drain more evenly if you decide to drain it.
Protect belongings
Lift boxes off the garage floor and take photos of the water for your records.
Gas, electric, hybrid and tankless repair
Gas and electric tanks make up most of the repairs we see around Contra Costa Boulevard, and the fixes are routine. Heat pump hybrid units add a compressor and air filter to the list, and they need clear space around the unit so the compressor can breathe.
Tankless units fail differently. Scale on the heat exchanger, a blocked intake or a flame sensor that needs cleaning will show up as an error code or lukewarm water. Our tankless water heater page covers flushing and descaling in detail.
No hot water this morning?
Call the 24/7 line and tell us whether the unit is gas, electric or tankless. We will talk through the checks you can safely do while the tech is on the way.
Code details that matter on any repair
Water heater work in California follows the California Plumbing Code, and the City of Martinez's own water heater handout, which cites those code sections, is a useful snapshot of what inspectors look for. It lists seismic strapping with two straps and a third on tanks over 52 gallons, a temperature and pressure relief drain that ends 6 to 24 inches above the ground, and a gas shutoff valve beside the unit.
Permit rules differ from one city to the next, so ask the Pleasant Hill building division whether your repair needs a permit. We follow the handout's items on every job because they protect your home regardless of who inspects.
Anode rods and tank life
The anode rod is a sacrificial metal rod that corrodes so the tank does not. Checking it every few years can add life to a tank, and a rod that has worn to a thin wire is a warning that the liner is next.
If your heater is well past ten years old, we will price both the repair and replacement so you can decide with real numbers, not a sales pitch.
What affects water heater repair cost
We quote after diagnosis and before work starts. The main factors:
Insurance usually pays for sudden water damage from a failed heater, but not for the heater itself when it simply wore out. Check your policy and keep photos.
Want your real number? Describe the job on the call and we quote it before work starts.
Service area
We repair heaters across 94523 and the nearby ZIP codes 94595 and 94596 near Walnut Creek. If you are in Martinez or Clayton, the same 24/7 line applies, and the Martinez page explains how permits work on that side of the county.
Repairs we make follow the manufacturer's instructions and the California Plumbing Code, which is based on the Uniform Plumbing Code (UPC). Relief valves, drains and gas shutoffs are checked on every visit, not only when they fail.
Common questions
Yes. The line runs 24/7. If the tank is leaking, shut off the cold water valve and call, and we will book the earliest visit available.
If the leak is from a fitting or relief valve, usually yes. If water is coming through the tank shell, replacement is the only fix.
Sediment can take up room in the tank, and a broken dip tube mixes cold water into the supply. A flush or a new dip tube often solves it.
Many tanks are near the end of life after about ten years. We price repair and replacement side by side so you can choose.
Follow the manufacturer's label, and never relight when you smell gas or the unit is wet. If a pilot keeps going out, call us.
Yes. We flush scale, clean flame sensors and replace failed parts. If an error code points to a heat exchanger failure, we explain options before replacing it.
Still have a question about your situation? Call (855) 575-2890 any hour and describe what you are seeing.