Starting January 1, 2027, it becomes illegal to sell or install a new gas water heater — tank or tankless — anywhere in the nine-county Bay Area (BAAQMD Rule 9-6). When your gas unit fails after that date, the only legal replacement is an electric heat pump water heater. The upside: switching now stacks utility rebates of $2,000–$5,500+ depending on your city. Here's exactly what the rule means and what you can claim.
What the 2027 Ban Actually Says
In March 2023 the Bay Area Air Quality Management District adopted amendments to Rule 9-6, setting a zero-NOx (nitrogen-oxide) standard for residential water heaters under 75,000 BTU. The only appliances that meet it today are electric. The key facts:
- It's a point-of-sale rule, not a teardown. You can keep and repair your existing gas water heater. The ban only applies when you buy or install a new one.
- It covers tank and tankless gas units alike — including Navien, Rinnai, and Noritz tankless models.
- It applies to all nine Bay Area counties, including every city in Santa Clara County: San Jose, Santa Clara, Cupertino, Campbell, Sunnyvale, Mountain View, Palo Alto, Los Gatos, Saratoga, Milpitas, Los Altos, and Morgan Hill.
- After Jan 1, 2027, no licensed contractor can legally install a new gas water heater, and retailers can't sell them in the region.
Why a Heat Pump Water Heater Is the Replacement
A heat pump water heater (HPWH) doesn't burn anything — it moves heat from the surrounding air into the tank, the same way a refrigerator works in reverse. That makes it 3 to 4 times more efficient than a gas unit, with no NOx, no carbon-monoxide risk, and no gas line. For a typical Santa Clara Valley home it's the compliant, lowest-operating-cost path once you switch to an electrification-friendly utility rate.
A standard 240V heat pump model needs a dedicated 30-amp circuit. Older San Jose homes on a 100-amp panel may need a panel upgrade — or a newer 120V plug-in HPWH that runs off a standard outlet with no panel work. We assess this before you buy, so there are no surprises.
Every Rebate, by City (Verified June 2026)
This is where the math turns in your favor. Your rebate depends on which utility serves your city — for a heat pump water heater replacing gas:
| Santa Clara (Silicon Valley Power) | $5,500 ($6,500 income-qualified) |
| Mountain View (SVCE + City) | up to $5,000 |
| Palo Alto (CPAU) | $3,500 or $2,300 turnkey |
| San Jose (San José Clean Energy) | $2,500 ($3,500 in EJ areas) |
| Cupertino · Campbell · Sunnyvale · Los Gatos · Saratoga · Milpitas · Morgan Hill · Los Altos (SVCE) | $2,000 (+$1,000 income-qualified) |
| Plus panel-upgrade & pre-wiring add-ons | $1,000–$2,000 |
Amounts verified from each utility's program (SVP, SVCE FutureFit, San José Clean Energy EcoHome, CPAU), June 2026. Final totals depend on income eligibility, equipment, and fund availability. We confirm your exact number during a free assessment.
Several cities also offer 0% financing or interest-free payment plans — San José Clean Energy's EcoHome plan covers up to $5,000 — and income-qualified households on CARE/FERA or FRAP/LIHEAP qualify for higher amounts.
2026 Is Your Window — Here's Why Timing Matters
You don't have to do anything while your gas unit works. But if it's 8+ years old, planning the switch now beats getting caught by a failure after the deadline. Wait, and you risk:
- Inventory crunch: as 2027 nears, suppliers stop stocking gas units to avoid stranded inventory.
- Permit and panel delays: an emergency heat-pump conversion can need electrical work that takes weeks — leaving you without hot water.
- Rebate uncertainty: programs are first-come, first-served and funding changes year to year.
Plan it on your terms and you capture today's rebates, choose the right equipment, and schedule the work when it's convenient — not during a cold-shower emergency.
What About Hard Water?
Santa Clara Valley water is hard, and scale shortens the life of any water heater. Heat pump units are more forgiving than tankless heat exchangers, but we still recommend a scale inhibitor or softener and a periodic tank flush to keep efficiency high across the unit's 12–15+ year life. We build the right water treatment into every install.