Plenty of Torrance garages hold an A. O. Smith tank, and when one misbehaves the repair list is short and familiar. Before anyone arrives, read the label, record how the heater behaves, and decide how much you are willing to put into an older tank. Our water heater repair hub shows how a visit is arranged.
Which parts fail on these tanks?
Six faults cover most calls on an A. O. Smith tank: a burner that drops out, a pilot that will not catch, a dead electric element or thermostat, a dripping relief valve, sediment noise, and a leaking shell. Match what you notice to the part below. The brand matters mainly when parts are ordered, since failure modes are shared across makers.
| What you notice | Likely part | Repairable? |
|---|---|---|
| Gas burner lights, then drops out | Flame sensor or thermocouple | Yes |
| Pilot will not catch | Pilot assembly or gas control | Often |
| Little hot water, electric | Lower element or thermostat | Yes |
| No hot water, electric | Upper element, thermostat or breaker | Yes |
| Drip at the side valve | Temperature and pressure relief valve | Yes |
| Rumbling while heating | Sediment on the tank floor | Sometimes |
| Puddle beneath the tank | Fitting, valve or the tank shell | Shell: no |
The valve at the side deserves respect. A dripping relief valve is the tank warning you about pressure or temperature, so do not cap it or plug it.
A shell leak is the one finding that ends the repair conversation. Once the steel liner has corroded through, nothing seals it, and you are pricing a new tank.
What should be on my notepad before the call?
Photograph the data label stuck to the tank. You want the model number, serial number, fuel, gallon size and any warnings. With those, a plumber can pull the right element or gas control and check the maker's literature. The serial also carries a build date that the manual explains how to decode.
Jot down what the heater does, not what you suspect. Does a light on the gas control blink, and how often? Is the pilot lit? Is water coming from the top, the side valve or beneath? Is the problem constant, or only in the morning?
Age is the other fact that steers the decision. Federal energy guidance gives a storage tank 10 to 15 years. When the serial date puts the unit near that range, the talk shifts from fixing to replacing, particularly if it also leaks.
How much can I do before a plumber comes?
Check the easy stuff only: breaker on, reset button flat on an electric tank, thermostat not set to its lowest notch, gas valve handle parallel to the pipe. Anything inside the burner compartment, the gas control or the flue belongs to a contractor. Electric elements also wait for a plumber, because water and power meet inside.
If gas has an odor, nothing gets lit and no switch gets flipped. The utility answers gas calls on 1-800-427-2200, so step outside and use it. If a person is in danger, that is 911. Per SoCalGas, if the meter was ever closed, only its staff reopen it.
When you do open an electric tank's cover, kill the breaker first and test for dead wires. Wet insulation or a scorched terminal means you put the cover back and call. If the answer ends up being a new electric tank, our electric replacement cost page is the next stop.
Does an older A. O. Smith tank deserve a repair?
Often not. A single failed part on a tank under ten years old is worth fixing. Replace when the shell leaks, or when an aged tank throws a second fault. If a repair estimate eats a big slice of what a new tank costs, the old one has told you something.
Guides from 2026 vary widely. A mid-size tank, 40 or 50 gallons, costs $800 up to $2,500 fitted, and many households pay $900 to $1,800. Fuel, venting, permit and code upgrades decide where a Torrance job lands. For the line items, open replacing a water heater.
Swapping a tank is regulated work. Websites of Torrance contractors say the city requires a permit for the swap, plus current code, strapping included. The city's own page would not load for me, so verify with Torrance Building and Safety. Usually the plumber obtains it.
What happens during a visit?
The plumber reads the plate, tests gas or power, finds the dead part and quotes in writing before touching anything. An element or thermocouple is typically a short job. If the shell has given up, the quote changes to a new tank, and you choose whether to proceed. Nothing starts until you agree.
Find out what is inside the price: parts, labor, removal of the old tank, permit, new connectors and valves. Ask also whether the maker's warranty could still apply, since terms depend on the model and purchase date. To start, request a quote and paste in the label details. Our desk reads requests on weekdays, nine until five.
Common questions
What makes the tank pop or rumble?
Sediment, nearly always. Minerals pile up at the bottom, water gets trapped beneath them and flashes to steam. Draining a young tank may help. Heavy layers in an old one often mean the tank is near retirement, and a plumber should inspect before you spend anything.
What keeps killing the pilot flame?
Often a thermocouple or flame sensor that has aged out. After that come drafts across the burner and a weak gas control, so the fix depends on a proper diagnosis rather than another relight. Relighting only postpones the problem. Have the cause found. The parts involved are described under pilot light repair.
Does water around the heater always mean a new tank?
No. A loose fitting, the relief valve or even condensation can leave a puddle. A leak through the shell does mean replacement. Dry the floor, watch where the first bead forms, and close the cold inlet valve while you wait. If you can't trace it, treat it as the tank.
Which temperature setting is best?
Energy Department advice is 120 F for typical homes, which limits scald risk and slows scale. When a household member has a health condition, ask a professional before turning it down. After any change, allow a few hours for the tank to settle.
This guide is one of many on plumber in Torrance.
Sources used
- U.S. Department of Energy, Energy Saver guide (tank life 10 to 15 years, 120 F setting)
- SoCalGas, shut off natural gas in an emergency
- Published 2026 cost guides for water heater replacement, national, checked November 2026
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