The current schedule
Air District materials list phased implementation by appliance type and capacity.
- Small natural-gas water heaters: January 1, 2027 schedule.
- Applicable natural-gas furnaces: January 1, 2029 schedule.
- Larger water heaters and boilers: later phases may apply.
What buyers should do
Treat this as a project-planning input, not a product-page badge. A contractor should confirm appliance type, manufacture date, project jurisdiction, electrical capacity, and any adopted exception or extension before purchase.
Primary sources
Use these agencies as the source of truth. Summit summarizes them for equipment planning and does not provide legal, tax, engineering, or permit advice.