California water heater requirements in 2026
The California Energy Commission says the 2025 Energy Code applies to permit applications submitted on or after January 1, 2026. Water-heater replacement follows the applicable alteration provisions; the correct path depends on the existing and proposed system.
The CEC's current alteration guidance includes conditional gas, propane and heat-pump options and provisions for existing electric-resistance systems. It does not support a blanket claim that every California gas replacement is banned. Local rules also need to be checked.
CEC: 2025 Energy Code · CEC: water-heater alterations
City-specific installation guides
San Diego water heater installation: compare replacement and tankless permit routes, then make inspection responsibilities clear.
Sacramento water heater replacement: check city permits, virtual inspection and separate SMUD heat-pump eligibility and cost evidence.
A documented permit example: San Diego
San Diego's simple plumbing/gas permit guidance includes ordinary water-heater replacement in a no-plan permit route. It excludes tankless replacements from that particular route. A tankless exclusion does not mean no permit is needed; ask which application applies.
San Diego plumbing and gas permit guidance
Use your own building department if the property is in Los Angeles, San Jose, Sacramento, San Francisco or another jurisdiction. Do not apply San Diego's route, fees or timing to a different city.
Questions to put in the installation scope
- Applicable permits, inspection arrangements and energy-code documentation
- Whether seismic restraint or other protective work is required
- Model-specific venting, combustion air and gas-supply requirements
- Electrical supply and circuit changes
- Drain pan, relief discharge and heat-pump condensate arrangements
- Garage, closet or other location-specific requirements
The installer and authority should determine which requirements apply. This list is a conversation guide, not an installation specification.
Rebates are not the former federal tax credit
For a new 2026 installation, do not count on the former federal §25C credit. The IRS states that property placed in service after December 31, 2025 is ineligible. Utility and state rebates are separate programmes with their own eligibility, funding and application requirements.
Current IRS credit guidance · DOE state-administered rebate information
Before you approve a quote
Confirm the exact model, full installed price, excluded work, permit responsibility and separate equipment and labour warranties. Ask the provider to explain the local requirements for your address and verify their current credentials through the appropriate authority.
Reviewed October 6, 2026. This is an information guide, not a guarantee of provider availability or an exhaustive statement of California law.
California installation questions
Does replacing a water heater in California need a permit?
Ask the city or county building department for your address. San Diego includes ordinary replacement in a simple plumbing/gas permit route, but tankless replacements use a different route. This is not a permit exemption.
Which California Energy Code applies in 2026?
The California Energy Commission says the 2025 Energy Code applies to permit applications submitted on or after January 1, 2026. Check the applicable alteration path and local requirements.
What should a California installation quote cover?
Ask about the exact model, permits, inspection, applicable seismic or protective work, venting, gas or electrical supply, drainage, removal and disposal. The requirements depend on the home and chosen equipment.