Water heater: repair or replace, cost, permits and rebates

For Silicon Valley homes · Updated October 2026 · Sources below

Most tank water heaters last about 10 to 15 years. A leak from the tank itself means it's time to replace it; most other problems (no hot water, a pilot that won't stay lit, a bad thermostat) can often be repaired. A replacement needs a city permit and earthquake straps, and heat pump models come with local rebates.

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Smell gas? Leave the house and call PG&E at 1-800-743-5000 or 911 from outside. Don't switch lights on or off.

The short version

Typical tank life: about 10-15 years
Water leaking from the tank itself can't be repaired - plan to replace
Every replacement needs a permit and seismic straps in California
Heat pump water heaters use 2-3 times less energy than standard electric ones and qualify for local rebates
Bay Area rule: new gas water heaters are set to be phased out starting 2027 - working ones can stay

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What it costs

Replace a tank water heater$600 - $2,500
Install a tankless water heater$1,400 - $3,900
Repair a water heater$228 - $1,017

Size, gas vs. electric, venting and permit needs change the price.

Typical ranges from published cost guides - mostly national figures. Bay Area prices usually run higher. Your actual price depends on your home and the job, and a pro gives you the real number. Source: HomeAdvisor cost guide (national) (Jun 2026). Have a quote? Check it with the Quote Explainer

Signs it's time to replace

Water pooling around the base of the tank
Rusty or discolored hot water
Popping or rumbling sounds that get louder
Running out of hot water faster than before
The tank is more than 10-12 years old (the date is in the serial number on the label)

Repair or replace?

Usually worth repairing: a bad thermostat or heating element, a gas valve or thermocouple, a leaking relief valve or drain valve.
Usually time to replace: a leaking tank, heavy rust, or a tank past 10-12 years that needs a costly repair.
If you replace, decide first between another tank, a tankless gas unit or a heat pump water heater - it changes the venting, the electrical work and the rebates.

In Silicon Valley

Bay Area Air District rule: starting January 2027, new water heaters sold in the Bay Area are set to be zero-emission (like heat pump models). The rule applies when you replace a water heater, not to working ones. In July 2026 the Air District proposed moving the date to January 2028 and adding exemptions; check the Air District's page for the latest.
Earthquake country: California law requires every water heater to be braced or strapped, and a seller must certify it in writing when a home is sold.
Local electricity providers (San José Clean Energy, Silicon Valley Clean Energy, Silicon Valley Power, Palo Alto Utilities) and BayREN offer rebates for heat pump water heaters when you replace a gas one.

Questions homeowners ask

How long does a water heater last?

The U.S. Department of Energy puts typical water heater life at about 10 to 15 years. Hard water, no maintenance and a garage install in a hot space can shorten it.

My water heater is leaking. What should I do right now?

Turn off the cold-water valve above the tank, turn off the gas (or the breaker for an electric unit), and put down a pan or towels. If the water is coming from the tank itself, it needs to be replaced; a leak at a pipe fitting or valve can often be fixed.

Do I need a permit to replace a water heater?

Yes. In California, replacing a water heater needs a plumbing permit, and a heat pump model usually also needs an electrical permit for its circuit. Your plumber normally pulls it, and the inspector checks the venting, gas line and earthquake straps.

Is a heat pump water heater worth it in the Bay Area?

Often, yes: they can be 2 to 3 times more efficient than a standard electric water heater, our mild climate suits them, and local rebates can cover a big part of the cost. They need some space around them and usually a 240-volt circuit, so ask the plumber to check your panel.

Will I have to replace my gas water heater because of the new Bay Area rule?

Not if it's working. The rule applies to new water heaters at the time of replacement. It's set for January 2027, and the Air District has proposed moving it to January 2028.

How much does a new water heater cost?

National cost guides put a tank replacement at about $600 to $2,500 and a tankless install at about $1,400 to $3,900. Bay Area prices usually run higher, and permits, venting, electrical work and rebates all change the final number.

Do you need a permit?

Yes - replacing a water heater needs a plumbing permit (and sometimes electrical).

General guidance based on California's building code - your city can have stricter rules, and zoning, historic and HOA rules can apply too. Check with your city's building department before you start.

Check the rule for your city

Rebates: Heat pump water heater

San José Clean Energy EcoHome Rebates
Silicon Valley Clean Energy Home Rebates
Silicon Valley Power Residential Rebates
City of Palo Alto Utilities Rebate Hub
Ava Community Energy rebates

Rebate programs change often and money runs out. Amounts are from each program's page as of Oct 2026 - always confirm on the program page, and check whether you must apply before you buy or install.

See the rebates for your ZIP

Questions to ask the pro

Is the permit included in the price?
What size do you recommend for my household, and why?
Tank, tankless or heat pump - what would each need in my home (venting, gas line, circuit)?
How long are the tank and the labor warrantied?
Can you help me apply for the heat pump rebate before you install?

Before you sign, check the contractor's license at cslb.ca.gov. How to hire a contractor in California

Go deeperReplacing a water heater: tank, tankless or heat pump?

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