Water heaters Cupertino

Cupertino water heaters: the instant permit, the noise sheet, the attic

Cupertino sorts a water heater replacement by fuel. A standard gas tank of the same or lower BTU rating, at a house outside an HOA, can be permitted instantly online by a licensed contractor. A heat pump water heater cannot: it needs a permit even when the owner installs it, filed in person or by email with the unit's clearances, decibel rating and a sound worksheet. Either way the city inspects the heater and then gives a final.

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  • Rules on this page checked against 14 public sources, October 2026
Apple Park in Cupertino, from the air
Apple Park in Cupertino, from the air. Photo: Daniel L. Lu, CC BY-SA 4.0, via Wikimedia Commons.
Gas tank swap
Instant permit: standard tank, same or fewer BTUs, no HOA
Heat pump unit
Not on the online portal; filed in person or by email
Inspections
Water heater inspection, then the final building inspection
Gas in existing buildings
25% of Cupertino's greenhouse gas emissions

Permits and local rules

Three Cupertino handouts and one Air District answer

  1. Water Heater Installation and Replacement

    Revised in 2024, the Building Division's guideline sets out the 2022 California Plumbing Code minimums for a replacement and requires a plumbing permit for every water heater installation. It places seismic straps within the upper and lower thirds of the tank, keeps the lower strap at least 4 inches above the controls, and sends any alternative bracing to the Seismic Safety Commission's guidelines with the city's approval. A closed system gets a listed expansion tank meeting IAPMO Z1088, on the building side of the check valve and sized to the manufacturer's instructions.

    Source: City of Cupertino Building Division (cupertino.gov)

  2. Home Upgrade Permit Guide

    The city's one-page guide for replacing a water or space heater says a heat pump water heater needs a permit even when the owner installs it, and that rebates require the city permit. It starts with a call to Silicon Valley Clean Energy's Go Electric Advisor, notes that heat pump permits are not available on the Accela Citizen Access portal, and has the finished installation inspected on request by phone or email. The Title 24 CF-1R energy form is asked for on HVAC jobs only, not on water heaters.

    Source: City of Cupertino (cupertino.gov)

  3. Instant Permits (Residential Only)

    Cupertino's instant permits are open only to licensed contractors with an active Accela Citizen Access account, in four steps: check that the project qualifies, register or log in, apply under the Building tab, and receive the permit. The water heater line is written to exclude a heat pump unit and to allow only a standard gas tank, not tankless, with no HOA and the same number of BTUs or fewer. Anything outside the list goes through a standard building permit.

    Source: City of Cupertino Building Division (cupertino.gov)

  4. Rule 9-6 and the 100-amp assumption

    The Air District's FAQ on its appliance rules says the 2027 zero-NOx date for small water heaters was set around the projected availability of units able to run on standard 100-amp residential service, the first of which reached consumers in fall 2022. It also says the amendments require no change-out of working appliances and apply only to newly installed ones. For a Cupertino ranch house still on low service, the district points to lower-voltage heat pump water heaters as a way around a panel upgrade.

    Source: Bay Area Air District (baaqmd.gov)

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 (cslb.ca.gov).

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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Two wall-mounted tankless water heaters plumbed with copper supply lines
Two wall-mounted tankless water heaters plumbed with copper supply lines. Photo: Behrat, CC BY-SA 3.0, via Wikimedia Commons.

The houses here

Orchard-era tracts, Eichler slabs and Cliff May ranch houses

Most Cupertino houses went up in the 1950s and 1960s on land that had been prune, apricot and cherry orchard, and two groups among them change how a water heater gets replaced. Fairgrove's 220 Eichlers from the early 1960s were built on concrete slabs with heat running through the floors and low or flat roofs overhead, which leaves no hidden route under the house for a new line. Rancho Rinconada's Cliff May ranch houses were built in the 1950s as low-cost, single-story homes, and many have since given way to two-story houses of 3,000 to 3,500 square feet. An original and a rebuild meet a heat pump water heater very differently, and in a modest 1950s house the electrical panel is the first thing to check.

The work

The swaps Cupertino's water heater handout already answers

  1. Same-size gas tank, instant permit

    A licensed contractor with an Accela Citizen Access account can pull the permit online and have it issued at once, as long as the new unit is a standard gas tank, not tankless, rated at the same or fewer BTUs, on a property outside a homeowners association. The city's handout then lists what the inspector checks beyond the tank itself: a sediment trap downstream of the appliance shutoff valve, a bonding jumper of at least 6 AWG copper on aboveground gas piping other than CSST, and insulated hot water piping.

  2. A heat pump in place of the gas tank

    Cupertino's heat pump handout asks for more than an application. It wants the product specifications with installation clearances and noise ratings, and a floor and site plan marking every indoor and outdoor unit, where the main electrical panel is and how big it is, and how far any outdoor unit stands from the property lines. The Sound Rating Worksheet then tests each unit's rating and setback against the noise ordinance in Chapter 10.48, so the spot chosen for the equipment has to work for the neighbors as well as the plumbing.

  3. Tankless units go the long way

    Tankless heaters are left out of Cupertino's instant permit, so even a straight swap goes in as a standard plumbing permit. The Air District groups most gas tankless units with larger heaters, whose zero-NOx date in the adopted rule is 2031, and its FAQ makes a point owners tend to miss: every gas-fired tankless water heater needs electricity for its control system, so it will not run during a power outage.

  4. A heater in the attic or above a finished ceiling

    Where a heater sits in an attic or an under-floor space, the handout wants an opening and passageway at least 22 by 30 inches and never smaller than the unit's largest part, solid flooring at least 24 inches wide, and a level 30 by 30 inch platform on the service side, with a receptacle and a permanent light. Where a leak would damage a ceiling or floor assembly below, a watertight, corrosion-resistant pan at least 1-1/2 inches deep drains through a 3/4-inch pipe to an approved spot.

  5. A relief valve drain the inspector can see

    Cupertino's handout reads like a checklist for the temperature and pressure relief discharge. The pipe runs full size with no valve or obstruction, drains by gravity through an air gap or to the outside, and ends pointing down between 6 inches and 2 feet above the ground, with an unthreaded end where anyone can see it discharge. It may not be trapped, may not empty into the heater's pan and must be made of material rated for the system's operating temperature.

Before you hire

Ask the Cupertino contractor before anything is ordered

  • Is this a standard gas tank at the same or lower BTU rating, and do you hold the Accela account the instant permit needs?
  • For a heat pump, which spec sheet gives the decibel rating for the Sound Rating Worksheet, and how far will any outdoor unit sit from the property line?
  • Do we have a check valve or backflow device, so the quote includes a listed expansion tank on the house side?
  • Will the hot water piping at the heater be insulated, and a bonding jumper run to the gas piping, as the city's handout requires?
  • Is your C-36 Plumbing license current on cslb.ca.gov, or C-20 if an HVAC contractor installs the heat pump?

Timing

When a Cupertino water heater job can happen

Cupertino allows construction on weekdays from 7 a.m. to 8 p.m. and on weekends from 9 a.m. to 6 p.m. On holidays it is prohibited, except that a homeowner or resident of a single-family house using domestic tools may work from 9 a.m. to 6 p.m. A heat pump permit sent by email to the permit center is processed in two to three business days, while a complete application brought in person is issued at the counter. Inspections are booked with the building inspectors once the unit is in.

Free, no obligation. Next, add your details in the request form.

Questions

Cupertino water heater questions, answered from the city's handouts

Can I install a heat pump water heater myself in Cupertino?

Yes, with a permit. The city's Home Upgrade Permit Guide says a permit is required for a heat pump water heater even if you are installing it yourself, and the heat pump permit handout allows the permit to be issued to either the property owner or a licensed contractor. Keep the permit card: the guide also notes that rebates require you to provide the city permit.

Our townhouse is in an HOA. Can the plumber use Cupertino's instant permit for a new gas tank?

No. The instant permit's water heater entry excludes properties with an HOA, so the replacement goes through a standard plumbing permit, with the same water heater and final inspections. Check the association's own rules as well before the plumber orders a different type or size of unit.

Does Cupertino require new or rebuilt homes to be all-electric?

Not anymore. The city adopted a policy in 2020 that required all new construction to be fully electric, then removed it after legal rulings. In its place the City Council approved a higher energy efficiency building code on September 17, 2024, for new residential, multifamily and commercial buildings. A water heater replaced in an existing house answers to the plumbing code and the Air District's rule instead.

What does the Cupertino inspector look for at the gas vent?

The handout wants the vent installed to the manufacturer's instructions, with no screw or rivet through the inner wall of a double-wall vent except at the transition from the draft hood or connector. A Type B or Type L vent ends at least 5 feet above the highest connected draft hood or flue collar, passes through roof flashing to a listed cap, and stays 3 feet above any forced-air inlet within 10 feet. Decorative shrouds are allowed only if listed.

Our original 1950s Rancho Rinconada house still has its old electrical panel. Is a heat pump water heater realistic?

Often. The Air District says many newer heat pump water heaters plug into a standard 120-volt outlet and that panel upgrades are not needed in every home. Cupertino's heat pump permit still asks for the main panel's size and location so staff can judge whether the house can carry the new load. If the house has never been rewired, have a licensed electrician look at the panel before a unit is chosen.

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.

  • cupertino.gov: waterheater updated 2024 (cupertino.gov)
  • cupertino.gov: heat pump permit requirement (cupertino.gov)
  • cupertino.gov: hp permitting guide (cupertino.gov)
  • cupertino.gov: Instant Permits Residential Only (cupertino.gov)
  • cupertino.gov: Building Division FAQ (cupertino.gov)
  • cupertino.gov: Switch from Gas to Electric (cupertino.gov)
  • cupertino.gov: reachcodes (cupertino.gov)
  • cupertino.gov: eichler handbook (cupertino.gov)
  • baaqmd.gov: 20260713 faq appliance rules 07062026 pdf (baaqmd.gov)
  • baaqmd.gov: 20260901 appliance rules myths vs facts 8312026r pdf (baaqmd.gov)
  • cupertinomuseum.org: ranchoRinconada
  • en.wikipedia.org: Cupertino, California

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