Starting January 1, 2026, California’s Title 24 energy code will prohibit natural gas heaters in new pool and spa construction.
New Rules for Heaters
Existing natural gas heaters are not affected—you can continue using your current system without modification. This update applies only to new builds and major renovations, and it introduces important changes for homeowners planning spa projects. Cookie Cutter Pools is here to help guide you through the new requirements. If you want to add a custom gunite spa to your pool project, then here are the highlights of the new rules. The new rules mostly impact in-ground, gunite spas since gas heaters are the preferred method to heat a spa to get to them to the high temperatures. Another option is to add a prefabricated spa to your pool project instead of building a gunite spa.
Key Updates for Spa Projects
California homeowners building a new spa in 2026 will need to adjust to new heating requirements:
Permit deadlines matter: Projects permitted before December 31, 2025 follow current rules.
New construction only: Existing pools and spas with natural gas heaters are grandfathered in.
Natural gas heaters prohibited: New builds cannot rely on natural gas heating as the primary source.
Propane heaters permitted: Propane-fired heaters remain an option, provided you have or install a propane tank.
Heat pumps or solar thermal required: These systems must serve as the primary heating method.
Dual systems for spas: Many spa/pool combos will require a heat pump or solar system paired with a propane backup, or a hybrid gas/electric heater. Hybrid systems will require both a gas line to be installed plus electrical upgrades.
Why This Matters for Spa Owners
No retrofits required: If you already own a natural gas heater, you can keep it.
Higher upfront costs: New builds may require additional equipment and electrical upgrades.
Lower operating costs: Heat pumps are efficient and reduce monthly bills.
Cleaner energy use: Aligns with California’s climate goals while meeting Title 24 spa compliance standards.
Propane flexibility: A practical option for rural or off-grid properties.
Why Gas Heaters Are Still Preferred for Spas
Gas heaters remain the fastest and most reliable way to heat a spa to 100+ degrees, far outperforming heat pumps in speed and temperature range. Heat pumps, while efficient for pools, cannot reach spa temperatures as rapidly. For homeowners who want reliable spa heating under the new code, options include:
Hybrid systems: Units that combine electric and gas heating to meet Title 24 requirements.
Dual setups: Using a heat pump or solar system for compliance, paired with a propane heater for spa performance.
Final Takeaways
The 2026 California pool energy code update applies only to new construction and major renovations. Existing natural gas heaters are grandfathered in and can continue operating without changes—no retrofits or replacements required. For new spa projects, homeowners must plan for heat pumps, solar or propane systems—often in hybrid configurations—to stay compliant while still enjoying the comfort of a properly heated spa. Reach out to Cookie Cutter Pools to help guide with with the new regulations.
Working with professional pool contractors, like the expert team at Cookie Cutter Pools, ensures that your vision is grounded in what’s actually possible. We help you avoid mistakes, save money, and enjoy a smooth, stress-free pool-building experience from concept to the first exhilarating splash!
At Cookie Cutter Pools, we specialize in crafting beautiful, functional, and fully customized in-ground pools and spas that bring your vision to life, without sacrificing safety, durability, or budget. Our expert pool contractors offer in-depth site assessments, honest advice, and detailed planning to help you make confident choices from day one.
Contact us today or give us a call at (916) 824-6899 to schedule your consultation and take the first step toward a perfectly designed backyard escape.
FAQ
- Do I need to replace my existing spa heater?
No. Existing natural gas heaters are grandfathered in and can continue operating. - Can I still use propane gas heaters for my spa?
Yes. Propane-fired heaters remain permitted under the new code. - Why shouldn’t I use electric heat pumps for a spa?
Electric heaters cannot reach spa temperatures effectively, and hybrid heaters will be needed that use both electric and gas.
