Water Heater Repair and Replacement in San Jose

The work

Water heater calls that follow San Jose's checklist

Switching to a heat pump unit in the garage
The city's page allows a heat pump water heater in a garage, basement or other conditioned space when it complies with the Northwest Energy Efficiency Alliance's Advanced Water Heater Specification at Tier 3 or higher. It needs both a plumbing and an electrical permit, which a single-family owner or contractor can take out together in one session at SJPermits.org. If the plan is to claim San José Clean Energy's EcoHome Rebate, the application has to be approved before installation begins.
An expansion tank on a closed system
The city's checklist requires an expansion tank wherever the water system is closed, and gives the example of a house with a pressure-reducing valve at the water service. Heated water has nowhere to expand in that case, so expect the inspector to look for the tank. Where the heater sits in a basement and its relief valve cannot drain by gravity, the city allows a special drainage provision.
A bigger tank needs more straps
Moving up a size changes the bracing. San José's list calls for three straps on a 75-gallon unit, four on a 100-gallon unit and one more for every additional 25 gallons. Its page passes on two methods from the Division of the State Architect: 24-gauge plumber's tape wrapped around the heater and lag-screwed to a 2x4 ledger bolted to the wall framing, or the conduit method using thinwall conduit with the same tape.
Tankless units on an outside wall
A tankless heater listed for exterior use may hang on a side or back wall, but in an HOA or planned development the CC&Rs have to allow it. Most units use positive-pressure vents, usually stainless steel, and Type B vent is not acceptable for them. An outdoor unit's receptacle must be GFCI-protected under a weatherproof bubble cover, or the unit hard-wired, and the city wants gas line sizing calculations on its worksheet at the first inspection.
A gas tank that also heats the floors
Some radiant floor systems are fed by a gas storage water heater rather than a boiler. The Air District's October 2026 proposal would give that hydronic use a time-limited exemption from the zero-NOx standard, for heaters manufactured before January 1, 2033 and only with an exemption certificate obtained before installation. In an Eichler, the city's standards also note that the original slab systems are nearing or past their service life, so ask what the heater actually serves before pricing it.

Hotel Valencia at Santana Row in San Jose. Photo: Payton Chung, CC BY 2.0, via Wikimedia Commons.

The houses here

No attic in an Eichler, a car beside the tank in a tract garage

Where a San Jose water heater sits shapes most of the job. For a heater in an attached garage, the city's installation page has its own rules on burner height and combustion air, and a bollard drawing for protection from a car. San Jose's Eichlers are another case. The city's Eichler design standards describe houses with no attic space, plumbing under a concrete slab and radiant heating embedded in it, which leaves few concealed routes for a new vent or line. For a house with a basement, the city's page sets out a separate list for that location, from a 3-inch base under the heater to drainage for a relief valve that cannot drain by gravity.

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Permits and local rules

The rules a San Jose water heater bid should name

The city's installation requirements
San José's Water Heaters page, updated in April 2026, applies to every property type. Beyond the permit, it lists where gas heaters may not go unless direct-vent, the strap count by tank size, the NEEA Tier 3 condition for heat pump models, the expansion tank on a closed system, a bollard illustration for garage installations, and, for tankless units, combustion air openings within the top and bottom 12 inches of an enclosure. The permit card, the manufacturer's instructions and the listed vent's instructions must all be on site for every inspection.
City of San José, Water Heaters (opens in a new tab)
Rule 9-6: the October 2026 proposal
The Air District's staff report proposes moving the zero-NOx date for water heaters of 75,000 BTU per hour or less from January 1, 2027 to January 1, 2028, and for larger units from 2031 to 2033. It adds exemptions with a certificate obtained before installation: owners at or below 80 percent of area median income or housing cost-burdened, and one-time exemptions for a space under 700 cubic feet that cannot be ventilated, a garage ceiling below 7.2 feet, or electrical limits a licensed contractor documents.
Bay Area Air District, Rule 9-6 staff report (opens in a new tab)
Smoke and carbon monoxide alarm affidavit
State law requires verification that smoke and carbon monoxide alarms are properly installed whenever a building permit is obtained for an alteration to a home, and San José's code enforcement guidance explains how that works. For jobs where no inspector needs to come inside, and the city names water heater replacements in a garage as one, the owner or a licensed contractor signs the Affidavit of Smoke Alarm and Carbon Monoxide Alarm Installation instead. The alarms must be models approved and listed by the State Fire Marshal.
City of San José, Code Enforcement (opens in a new tab)
San José Clean Energy's EcoHome Rebate
The city's community energy provider offers its EcoHome Rebate to current San José Clean Energy customers replacing a gas water heater with a heat pump model, and the primary PG&E account holder must apply. Applications must be approved before installation begins, approved funds are reserved for 120 days, the old gas appliance should be removed and its gas line capped, and proof of final permit is required for every installation. Owners may use any contractor or install the unit themselves.
San José Clean Energy (opens in a new tab)

State license for this work: C-36 Plumbing, C-20 Warm-Air Heating, Ventilating and Air-Conditioning, C-10 Electrical. Look up a contractor's license on the CSLB website (opens in a new tab).

Timing

Before the Air District's November vote

The Air District's Board will hold its public hearing on the Rule 9-6 amendments on November 4, 2026, and public comments close on November 1. Until the Board acts, the adopted rule's January 1, 2027 date for small water heaters stands. The rule follows the date a heater was manufactured and applies only when an existing unit is replaced, so a gas tank that fails in the coming months can still be replaced with a gas unit made before the compliance date. A heat pump upgrade timed around the rebate's 120-day reservation is the other path.

Before you hire

Settle these with the plumber first

Is the heat pump model you are quoting rated NEEA Tier 3 or higher, and where in the garage will it stand?
Does our house have a pressure-reducing valve, and is the expansion tank included in your price?
Will you wait for the EcoHome Rebate approval before starting, and cap the old gas line afterward?
Who signs the smoke and carbon monoxide alarm affidavit, and are our alarms State Fire Marshal listed?
Is your C-36 Plumbing license current on the cslb.ca.gov lookup?

Questions

Questions San Jose owners ask about water heaters

Can a heat pump water heater go in my San Jose garage?

Yes, if the model complies with NEEA's Advanced Water Heater Specification at Tier 3 or higher, which San José requires for garages, basements and conditioned spaces. The room also has to give the unit enough air, and its condensate needs a proper drain. If a car parks near it, ask about the bollard detail on the city's installation page.

Why does the San Jose inspector want an expansion tank on our new water heater?

Because the city's checklist requires one in a closed system, and its example is a house with a pressure-reducing valve at the water service. With that valve in place, water heated in the tank has nowhere to expand. Ask the plumber to check for a regulator at the service before quoting.

Our Eichler has no attic. Where can a tankless heater or heat pump unit go?

In the Fairglen Additions, the city's Eichler standards keep exterior mechanical equipment out of sight from the street: at ground level beside or behind the house, on a side or rear wall that does not face the street, or on the rear half of the roof, screened if visible. They also allow plumbing pipes to be embedded in the rigid roof insulation.

Can I still replace a broken gas water heater with gas in San Jose next year?

Under the rule as adopted, small gas water heaters manufactured after January 1, 2027 must meet the zero-NOx standard. The Air District's October 2026 proposal would move that date to January 1, 2028 and add exemptions, but it is not final until the Board votes on November 4, 2026.

Will San José Clean Energy pay a rebate if the heat pump is already installed?

No. The EcoHome Rebate requires the application to be approved before installation begins, and a reservation has to be in place before any work starts. It also asks for proof of final permit, so the city permit and its inspections are part of qualifying, not an extra step.

Does the inspector need to come inside for a garage water heater swap?

Usually not for the alarms. San José lets the owner or a licensed contractor self-certify smoke and carbon monoxide alarms on its affidavit when the permitted work, such as a water heater replacement in a garage, does not require an interior inspection.

Keep exploring

More on water heater work and San Jose

Other trades in San Jose

Guides and smaller jobs

Where this page belongs

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

San Jose water heaters: garage rules, Eichler slabs, the 2026 vote

Water heater calls that follow San Jose's checklist

Switching to a heat pump unit in the garage

An expansion tank on a closed system

A bigger tank needs more straps

Tankless units on an outside wall

A gas tank that also heats the floors