Water Heater Repair in San Francisco, CA
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San Francisco's mild but long cold season and shaky power both wear on a water heater
San Francisco homes need heat from November through May, seven months of the year, and winter nights average 45°F from December through February. Incoming water stays cold through that stretch, so a water heater's burner or heating element has to run longer and more often to keep up. That extra run time wears on the igniter and the thermostat first, and you notice it as water that takes longer to heat or never gets as hot as it used to.
Power matters too. Statewide, 17% of households went at least 24 hours without power in 2024, and the county has logged 50 damaging wind events over the past ten years. Most gas water heaters with electronic ignition will not relight on their own once power comes back, so after an outage you may find you have no hot water until the igniter is reset.
- 45°F
- the average winter night, and colder incoming water means longer heating
- 7 months
- November through May, the months homes here need heat
- 17%
- of California households lost power for a day or more in 2024, and a heater with an electric element or electric ignition stops without it
NOAA nClimDiv, 1991–2020 normals
A new water heater would cut about $110 a year off hot water for a typical California home.
Estimates for a typical California home, compared with an older unit built to the federal minimum, from EIA household energy data and California fuel prices. Your home will differ.
Repair makes sense when an element, thermostat or gas valve has failed.
Replacement makes sense when the tank itself is leaking.
- Why is my water heater leaking from the bottom?
- The most common reason is that the tank itself has rusted through and is failing. Sediment builds up on the bottom of the tank over years, and it corrodes the steel from the inside until a crack or hole forms. Once the tank is leaking, it can't be patched or sealed, it needs to be replaced. A leak can also come from a loose drain valve or a fitting near the bottom, which a contractor can check before condemning the whole tank.
- Why won't the pilot light on my water heater stay lit?
- Usually the thermocouple has worn out and stopped sensing the flame. The thermocouple is a small sensor that sits in the pilot flame and tells the gas valve it's safe to keep gas flowing. When it fails, the valve shuts off the gas as soon as you let go of the button, even though the pilot lit just fine. A dirty pilot orifice or a draft blowing the flame out can cause the same thing, so a contractor will check both before replacing anything.
- Can a tankless water heater be repaired?
- Yes, most problems with a tankless water heater are repairable. Common issues include a clogged inlet filter, a buildup of scale on the heat exchanger, or a failed igniter, and all of these can be fixed without replacing the unit. Scale buildup is worth asking about specifically, since tankless units need periodic descaling to keep working properly. A contractor can run the error code the unit is showing and tell you what's actually wrong with it.