A plumber fixes most water heater faults on the day of the visit: a dead thermostat, a worn igniter, a leaking valve, a tank full of sediment. We'll arrange for a local plumber to come to your Los Angeles home, find the fault and give you a written quote before any work starts. If the tank itself has failed, the honest answer is replacement, and the quote says so.
This page covers what usually goes wrong, what repairs cost, when to stop repairing, and the Los Angeles rules that apply to the work. It sits under the main page for City of Angels Plumbing, and it links to the detail pages for each fault and each brand.
Do plumbers fix water heaters?
Yes. Repairing and replacing water heaters is routine plumbing work, and it covers gas tanks, electric tanks and tankless units. A plumber tests the thermostat, heating element, igniter, thermocouple, valves and the tank for leaks, replaces the failed part, and tells you whether the heater has enough life left to be worth fixing.
Some jobs sit across trades. A gas heater that will not light may be a gas supply problem, a vent problem or a part failure. A heat pump water heater has a refrigerant circuit and control board as well as the plumbing. When you ask for a quote, say what type of unit you have and the brand on the label, so the right person comes with the right parts.
If you only want to know who to call to check a hot water heater, it is a plumber. An electrician handles the circuit feeding an electric unit, and a plumber handles everything on the water and gas side. Most faults are found in the first visit.
What is the most common problem with a hot water heater?
The most common faults are a failed heating element or thermostat on electric units, a dirty or failed igniter or thermocouple on gas units, sediment build-up in the tank, and leaks from valves or fittings. A leak from the tank body itself is the one fault that usually ends the heater's life.
Here is how they show up:
- No hot water at all: a tripped breaker, a failed element or thermostat (electric), or a pilot or igniter that will not stay lit (gas). Our page on why you have no hot water walks through the checks.
- Lukewarm water that runs out fast: one failed element, a broken dip tube, or a tank half full of sediment.
- Rumbling or popping: sediment baked onto the bottom of the tank. LADWP recommends flushing a water heater at least once a year, because minerals drop out of heated water and build up as sand-like deposits.
- Water around the base: a loose fitting or a failed relief valve is cheap to fix. A rusted tank is not. See how to repair water heater leakage.
Hard water makes sediment worse. LADWP reports average hardness of 147 mg/L as calcium carbonate in the San Fernando Valley and western Los Angeles, 168 mg/L around Silver Lake, downtown and South Los Angeles, and 279 mg/L in eastern Los Angeles and the Harbor area. Where you live in the city changes how fast a tank fills with scale.
Is it cheaper to repair a water heater or replace it?
Repair is cheaper while the tank is sound and the heater is under about ten years old. A common rule is to replace when the repair costs more than half the price of a new unit, when the tank leaks, or when a storage heater is past 10 to 15 years, the range the U.S. Department of Energy gives for storage heaters.
Age matters more than the fault. A $300 element on an eight-year-old tank is a fair repair. The same $300 on a 14-year-old tank buys a few months. Ask the plumber to put both numbers on the quote: the repair, and a replacement price for the same size.
Replacement is also the moment to ask about the alternatives. Our comparison of tank vs tankless water heaters shows what changes in cost, space and gas line work, and the guide to water heater replacement cost lists the prices for each type.
How much does water heater repair cost in Los Angeles?
Most standard tank repairs in Southern California fall between about $150 and $650, and tankless repairs usually run $200 to $1,100. These are guide figures from published prices, not a quote. The real price depends on the part, how easy the heater is to reach and whether a permit is needed.
| Repair | Guide range |
|---|---|
| Service call and diagnosis | $75 to $150 |
| Thermocouple, pilot or igniter repair | $175 to $400 |
| Tank flush | $150 to $275 |
| Most standard tank repairs | $150 to $650 |
| Major tank-heater repairs | $500 to $1,500 |
| Tankless water heater repair | $200 to $1,100 |
These figures come from published prices of Southern California plumbing businesses and from the Angi and HomeAdvisor cost guides, checked in November 2026. They vary by business, so treat them as a guide and use the written quote as the real number. For the call-out fee on its own, see plumber service call cost.
What pushes a quote up: a water heater in an attic or a tight closet, a part that has to be ordered, venting that no longer meets code, and an old shut-off valve that will not close and has to be replaced first.
What do Rheem, Navien, Rinnai and Noritz repairs involve?
Brand matters for parts and for tankless units. Rheem makes both tank and tankless models, so the fix depends on which you have. Navien, Rinnai and Noritz are mainly tankless, where the usual faults are a scaled-up heat exchanger, a blocked intake or exhaust, a flame sensor, or an error code on the display.
For a tankless unit, give the plumber the model number and the error code before the visit. Many codes point straight at the cause: flame failure, ignition failure, or a venting problem. A scaled heat exchanger is cleared by descaling the unit, which suits Los Angeles homes with hard water.
We have separate pages for Rheem electric water heater repair and for gas water heater repair. A Whirlpool or A. O. Smith tank follows the same logic as any gas or electric tank: test, find the failed part, decide whether the tank is worth saving.
Heat pump water heaters are a different case. They use a compressor and refrigerant, so ask whether the plumber handles the whole unit or only the plumbing connections, and ask for the manufacturer's support line if the fault is in the heat pump section.
What do thermostat and igniter repairs involve?
A thermostat or element repair on an electric heater means shutting off power, draining enough water to reach the part, replacing it and testing the temperature. An igniter or thermocouple repair on a gas heater means checking the gas supply, cleaning or replacing the part and confirming the flame is stable. Both are quick when the tank is healthy.
Gas faults deserve care. If you smell gas, leave the building, then call SoCalGas on 1-800-427-2200 from outside, and call 911 if you are in danger. Do not touch light switches or try to repair anything. Gas piping work needs a plumber with a California contractor license under California law, so DIY stops at relighting a pilot as the label describes. Our page on the water heater pilot light repair covers what is safe to check.
Set the thermostat to about 120 degrees. The U.S. Department of Energy gives 120 degrees as the usual home setting, and hotter water raises scald risk, especially for children and older adults.
What are the Los Angeles rules for water heater work?
Replacing a water heater in the City of Los Angeles normally needs a plumbing permit from LADBS. The exception is a contractor registered in the LADBS contractor registration program, which can replace a heater of the same gallon size, BTU rating and vent capacity without a separate permit. Water heaters in California are also strapped against earthquakes.
Three things to know:
- Permit: LADBS says a plumbing permit is generally required to replace a gas water heater in a single-family home. Ask the plumber who pulls the permit, and keep the paperwork. See our page on the plumbing permit for a water heater.
- Strapping: California requires a water heater to be braced against earthquakes, with two straps on the tank. A good plumber checks them on every visit.
- Gas heater emissions: South Coast Air Quality Management District adopted Rule 1146.2 in June 2024 with zero-emission dates that begin in 2026 for some new-building units and come later for existing buildings. The rule targets larger gas units such as tankless models. Ask the plumber which rules apply to your heater before you choose a replacement.
If you rent, restoring hot water is generally the landlord's job. Look at our page on no hot water in an apartment building.
What about dip tubes, drain valves and mobile home heaters?
A broken dip tube makes the heater run out of hot water quickly, because cold water mixes with the hot at the top of the tank. A leaking drain valve is a small part that is replaced after draining the tank. Mobile home heaters are smaller and vented differently, so the part list changes, but the diagnosis is the same.
LADWP notes that older plastic dip tubes can turn brittle and shed white flakes into the hot water. If you see white bits in your faucet screens and only on the hot side, say so on the quote request. A plumber replaces the tube, flushes the tank and cleans the aerators.
For a drain valve, a plumber often swaps the valve while the tank is drained for a flush, which saves a second visit. In a mobile home, tell the plumber the make and model, because the heater may be a mobile-home-rated unit and not every tank fits.
Does a plumber near me, or in Torrance, cover my address?
We cover homes in the City of Los Angeles. Torrance is its own city, outside that area, so a Torrance address is not part of this service. Within Los Angeles, a local plumber comes to you: tell us your neighborhood on the quote form and the job is arranged from there.
Use the quote page to describe the heater: gas or electric, tank or tankless, the brand, the age if you know it, and what it is doing. A photo of the label on the side of the tank helps the plumber bring the right part.
What size water heater do I need?
Water heater installation starts with sizing. Size depends on how much hot water your household uses in the busiest hour, not only on how many people live there. A plumber reads the first-hour rating on the heater's yellow energy label and compares it with your morning and evening use. A larger family, two bathrooms in use at once or a soaking tub all push the size up.
For a swap, many homes keep the existing size, which also keeps the LADBS paperwork simple. If you want to move from 40 to 50 gallons, or to tankless, the venting and gas line may change, and so may the permit. Ask for the first-hour rating of the new unit, not just its tank size.
What is the anode rod, and does it matter?
The anode rod is a metal rod inside a storage tank that corrodes in place of the tank walls. Once it is used up, the steel starts to rust. Replacing it can add years to a tank, but only if the tank is still sound. Check it on tanks that are around five to eight years old.
If the rod is already gone and the heater is more than ten years old, replacing the rod usually costs more than it saves. See anode rod water heater replacement for the details.
Common questions
Do plumbers replace water heaters?
Yes. Replacement is one of the most common water heater jobs. A plumber removes the old tank, sets and straps the new one, connects water, gas or power, fits a relief valve and discharge line, and in Los Angeles makes sure the permit is handled. See plumber for water heater replacement for the steps.
What is the new law for water heaters in California?
There is no single new statewide rule that covers every home. Air district rules matter most. South Coast Air Quality Management District adopted zero-emission standards for some gas units in June 2024, with dates from 2026 for certain new buildings and later for existing ones. Ask the plumber what applies to your heater and address.
What is the average lifespan of an electric hot water heater?
The U.S. Department of Energy says most storage water heaters last 10 to 15 years, and tankless units can last more than 20. Electric tanks often reach the top of that range in soft-water areas and fall short where hard water scales the elements. Flushing once a year helps.
How much does it cost to fix a tankless water heater?
Published prices for Los Angeles put tankless repairs at roughly $200 to $1,100. The low end is a cleaning or a sensor, the high end a heat exchanger or control board. Descaling often fixes error codes in hard-water areas. Use the written quote, not these figures, as the real price.
Can plumbers fix heating?
Plumbers fix water heating: the heater, its valves, pipes and gas connection. Heating and air conditioning systems for the rooms of the house, such as furnaces and heat pumps for space heating, belong to a heating and air conditioning contractor. A combined system needs both, so describe the equipment when you ask for a quote.