On-site systems: solar, pool heating, EV readiness and related controls

Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:

• CRC § 110.4 High relevance — show source text

  A solar pool heating system with a solar collector surface area that is equivalent to the following: A. For nonresidential and multifamily buildings, 65 percent or greater of the pool and/or spa surface area. B. For single-family buildings, 60 percent or greater of the pool and/or spa surface area. 2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The supplementary heater can be of any energy source; or 3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy. 4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater; or 5. A pool heating system determined by the Executive Director to use no more energy than the systems specified in Items 1, 2, 3, or 4 above.

  Exception 1 to Section 110.4(c): Portable electric spas compliant with 20 CCR §1605.3(g)(7) of the Appliance Efficiency Regulations.

  Exception 2 to Section 110.4(c): Alterations to existing pools and/or spas with existing heating systems or equipment.

  Exception 3 to Section 110.4(c): A pool and/or spa that is heated solely by a solar pool heating system without any backup heater.

  Exception 4 to Section 110.4(c): Heating systems that are used exclusively for permanent spa applications in existing buildings with gas availability.

  Exception 5 to Section 110.4(c): Heating systems that are used exclusively for permanent spa applications where there is an inadequate Solar Access Roof Area (SARA) as specified in Section 150.1(c)14 for a solar pool heating system to be installed.

  (d) Controls for heat pump pool heaters with supplementary heating. Heat pump pool heaters with supplementary heaters shall have controls that meet the following:

  1. A supplementary heater shall not operate when the heating load can be met by the heat pump pool heater alone; and
  2. The cut-on temperature for heat pump heating is higher than the cut-on temperature for supplementary heating, and the cut-off temperature for heat pump heating is higher than the cut-off temperature for supplementary heating.

  SECTION 110.5—NATURAL GAS CENTRAL FURNACES, COOKING EQUIPMENT, POOL AND SPA HEATERS, AND FIREPLACES: PILOT LIGHTS PROHIBITED

  Any natural gas system or equipment listed below may be installed only if it does not have a continuously burning pilot light:

  (a) Fan-type central furnaces.

  54 2025 CALIFORNIA ENERGY CODE

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  ALL OCCUPANCIES—MANDATORY REQUIREMENTS FOR THE MANUFACTURE, CONSTRUCTION AND INSTALLATION OF SYSTEMS, EQUIPMENT AND BUILDING COMPONENTS

  (b) Household cooking appliances.

  Exception to Section 110.5(b): Household cooking appliances without an electrical supply voltage connection and in which each pilot consumes less than 150 Btu/hr.

  (c) Pool heaters.

  (d) Spa heaters.

  (e) Indoor and outdoor fireplaces.

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code.

• CRC § 110.0 Medium relevance — show source text

  110.0 Systems and Equipment—General . . . . . . . . . . . . . . . 39

  110.1 Mandatory Requirements for Appliances . . . . . . . . . 39

  110.2 Mandatory Requirements for Space-Conditioning Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

  110.3 Mandatory Requirements for Service Water-Heating Systems and Equipment . . . . . . . . . . . . . . . . . . . . . . . 52

  110.4 Mandatory Requirements for Pool and Spa Systems and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

  110.5 Natural Gas Central Furnaces, Cooking Equipment, Pool and Spa Heaters, and Fireplaces: Pilot Lights Prohibited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

  110.6 Mandatory Requirements for Fenestration Products and Exterior Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

  110.7 Mandatory Requirements to Limit Air Leakage . . . . 57

  110.8 Mandatory Requirements for Insulation, Roofing Products and Radiant Barriers. . . . . . . . . . . . . . . . . . 57

  110.9 Mandatory Requirements for Lighting Controls. . . . 59

  110.10 Mandatory Requirements for Solar Readiness. . . . . 60

  110.11 Mandatory Requirements for Electrical Power Distribution System . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

  110.12 Mandatory Requirements for Demand Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

  SUBCHAPTER 3 NONRESIDENTIAL, HOTEL/MOTEL OCCUPANCIES, AND COVERED PROCESSES—MANDATORY REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

  120.0 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

  120.1 Requirements for Ventilation and Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

  120.2 Required Controls for Space-Conditioning Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

  120.3 Requirements for Pipe Insulation . . . . . . . . . . . . . . . . 75

  120.4 Requirements for Air Distribution System Ducts and Plenums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

• CRC § 110.4 Medium relevance — show source text

  Solar pool heating system with a solar collector surface area that is equivalent to 65 percent or greater of the surface areas of the pool or spa or a combination of both respectively; or 2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The control for the heat pump pool heater shall meet the requirements specified in Section 110.4(d). The supplementary heater can be of any energy source; or 3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy; or 4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater;

  or

  5. A pool heating system determined by the Energy Commission Executive Director to use no more energy than the systems specified in Item 1, 2, 3, or 4 above.

  Exception 1 to A5.204.1.1: Portable electric spas compliant with 20 CCR, Section 1605.3(g)(7) of the Appliance Efficiency Regulations.

  Exception 2 to A5.204.1.1: A pool or spa that is heated solely by a solar pool heating system without any supplementary heater.

  Exception 3 to A5.204.1.1: An existing building with inadequate Solar Access Roof Area (SARA) as specified in Section 140.10(a) for a solar pool heating system to be installed.

  Exception 4 to A5.204.1.1: Heating systems which are used exclusively for permanent spa applications in existing buildings with gas availability.

  SECTION A5.211—RESERVED

  SECTION A5.212—ELEVATORS, ESCALATORS AND OTHER EQUIPMENT

  A5.212.1 Elevators and escalators. In buildings with more than one elevator or two escalators, provide systems and controls to reduce the energy demand of elevators and escalators as follows. Document systems operation and controls in the project specifications and commissioning plan.

  A5.212.1.1 Elevators. Traction elevators shall have a regenerative drive system that feeds electrical power back into the building grid when the elevator is in motion.

  A5.212.1.1.1 Car lights and fan. A parked elevator shall turn off its car lights and fan automatically until the elevator is called for use.

  A5.212.1.2 Escalators. An escalator shall have a Variable Voltage Variable Frequency (VVVF) motor drive system that is fully regenerative when the escalator is in motion.

  A5.212.1.4 Controls. Controls that reduce energy demand shall meet requirements of CCR, Title 8, Chapter 4, Subchapter 6 and shall not interrupt emergency operations for elevators required in CCR, Title 24, Part 2, California Building Code.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-15

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  SECTION A5.213—ENERGY EFFICIENT FRAMING

• CRC § 110.4 Medium relevance — show source text

  TABLE 110.4-A—HEATING EQUIPMENT STANDARDS	Col2
  HEATING ENERGY SOURCE	STANDARD
  Electric Resistance	UL 1261
  Gas-fired	ANSI Z21.56/CSA 4.7a
  Heat Pump	AHRI 1160 and one of the following: CSA C22.2 No. 236, UL 1995, or UL/CSA 60335-2-40
  Solar	ICC/APSP 902/SRCC 400 for solar pool heaters, ICC 901/SRCC 100 for solar collectors

  2. Piping. At least 18 inches of horizontal or vertical pipe shall be installed between the filter and the heater or dedicated suction and return lines, or built-in or built-up connections shall be installed to allow for the future addition of solar heating equipment;
  3. Covers. Outdoor pools and/or spa with electric or gas heating equipment shall be installed with a pool cover.
  4. Directional inlets and time switches for pools. If the system or equipment is for a pool: i. The pool shall have directional inlets that adequately mix the pool water; and ii. A time switch or similar control mechanism shall be permanently installed as part of a pool water circulation control system that will allow all pumps to be set or programmed to run only during off-peak electric demand period, and for the minimum time necessary to maintain the water in the condition required by applicable public health standards.

  (c) Heating source sizing. Heating systems or equipment for pools and/or spas shall meet one of the sizing requirements 1 through 5 below:

  1. A solar pool heating system with a solar collector surface area that is equivalent to the following: A. For nonresidential and multifamily buildings, 65 percent or greater of the pool and/or spa surface area. B. For single-family buildings, 60 percent or greater of the pool and/or spa surface area.
  2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The supplementary heater can be of any energy source; or
  3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy.
  4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater; or
  5. A pool heating system determined by the Executive Director to use no more energy than the systems specified in Items 1, 2, 3, or 4 above.

  Exception 1 to Section 110.4(c): Portable electric spas compliant with 20 CCR §1605.3(g)(7) of the Appliance Efficiency Regulations.

  Exception 2 to Section 110.4(c): Alterations to existing pools and/or spas with existing heating systems or equipment.

  Exception 3 to Section 110.4(c): A pool and/or spa that is heated solely by a solar pool heating system without any backup heater.

  Exception 4 to Section 110.4(c): Heating systems that are used exclusively for permanent spa applications in existing buildings with gas availability.

  Exception 5 to Section 110.4(c): Heating systems that are used exclusively for permanent spa applications where there is an inadequate Solar Access Roof Area (SARA) as specified in Section 150.1(c)14 for a solar pool heating system to be installed.

• CRC § 204.1 Medium relevance — show source text

  ** Buildings complying with the second level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on building type and the type of energy systems included in the building project. If the newly constructed building or addition does not include indoor lighting or mechanical systems, then no additional performance requirements above Title 24, Part 6 are required.

  1. For nonresidential building projects that include indoor lighting or mechanical systems, but not both: No greater than 90 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
  2. For nonresidential building projects that include indoor lighting and mechanical systems: No greater than 85 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
  3. For high-rise residential and hotel/motel building projects: No greater than 95 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.

  Note: For Energy Budget calculations, high-rise residential and hotel/motel buildings are considered nonresidential buildings.

  SECTION A5.204—MANDATORY REQUIREMENTS FOR ALTERATIONS TO EXISTING BUILDINGS

  A5.204.1 Energy efficiency . Alterations to existing nonresidential buildings shall comply with Section A5.204.1.1.

  A5.204.1.1 Altered pool and/or spa heating for existing nonresidential buildings . Alteration of existing nonresidential pool and/or spa heating system shall meet the following.

  Heating source sizing. Heating systems or equipment for pools or spas shall meet one of the sizing requirements of Items 1 through 5 below:

  1. Solar pool heating system with a solar collector surface area that is equivalent to 65 percent or greater of the surface areas of the pool or spa or a combination of both respectively; or
  2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The control for the heat pump pool heater shall meet the requirements specified in Section 110.4(d). The supplementary heater can be of any energy source; or
  3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy; or
  4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater;

  or

  5. A pool heating system determined by the Energy Commission Executive Director to use no more energy than the systems specified in Item 1, 2, 3, or 4 above.

  Exception 1 to A5.204.1.1: Portable electric spas compliant with 20 CCR, Section 1605.3(g)(7) of the Appliance Efficiency Regulations.

  Exception 2 to A5.204.1.1: A pool or spa that is heated solely by a solar pool heating system without any supplementary heater.

  Exception 3 to A5.204.1.1: An existing building with inadequate Solar Access Roof Area (SARA) as specified in Section 140.10(a) for a solar pool heating system to be installed.

  Exception 4 to A5.204.1.1: Heating systems which are used exclusively for permanent spa applications in existing buildings with gas availability.

  SECTION A5.211—RESERVED

  SECTION A5.212—ELEVATORS, ESCALATORS AND OTHER EQUIPMENT

• CRC § 207.3.2 Medium relevance — show source text

  A6.207.3.2 Efficiency. Equipment shall meet the applicable requirements of the Appliance Efficiency Regulations as required by Section A6.210.1, subject to the following:

  1. If more than one standard is listed in the Appliance Efficiency Regulations, the equipment shall meet all the standards listed; and
  2. If more than one test method is listed in the Appliance Efficiency Regulations, the equipment shall comply with the applicable standard when tested with each test method; and
  3. Where equipment can serve more than one function, such as both heating and cooling or both space heating and water heating, it shall comply with all the requirements applicable to each function; and
  4. Where a requirement is for equipment rated at its “maximum rated capacity” or “minimum rated capacity,” the capacity shall be as provided for and allowed by the controls, during steady-state operation.

  A6.207.3.3 Installation. Any service water-heating system or equipment may be installed only if the system or equipment complies with all of the applicable requirements of this subsection for the system or equipment.

  A6.207.3.3.1 Outlet temperature controls. On systems that have a total capacity greater than 167,000 Btu/hr, outlets that require higher than service water temperatures as listed in the ASHRAE Handbook, Applications Volume, shall have separate remote heaters, heat exchangers or boosters to supply the outlet with the higher temperature.

  A6.207.3.3.2 Temperature controls for public lavatories. The controls shall limit the outlet temperature to 110°F.

  A6.207.3.3.3 Insulation. Unfired service water heater storage tanks and backup tanks for solar water-heating systems shall have:

  1. External insulation with an installed R -value of at least R-12; or

  2. Internal and external insulation with a combined R -value of at least R-16; or

  3. The heat loss of the tank surface based on an 80°F water-air temperature difference shall be less than 6.5 Btu per hour per square foot.

  A6.207.3.3.4 Service water heaters in state buildings. Any newly constructed building constructed by the State shall derive its service water heating from a system that provides at least 60 percent of the energy needed for service water heating from site solar energy or recovered energy.

  Exception: Buildings for which the state architect determines that service water heating from site solar energy or recovered energy is economically or physically infeasible.

  A6.207.4 Natural gas central furnaces, cooking equipment and pool and spa heaters: Pilot lights prohibited.

  Any natural gas system or equipment listed below may be installed only if it does not have a continuously burning pilot light:

  1. Fan-type central furnaces.

  2. Household cooking appliances. Exception: Household cooking appliances without an electrical supply voltage connection and in which each pilot consumes less than 150 Btu/hr.

  3. Pool heaters.

  4. Spa heaters.

  A6.207.5 Controls for space-conditioning systems. Space- conditioning systems shall be installed with controls that comply with the applicable requirements of Subsections A6.207.5.1 through A6.207.5.5.

  A6.207.5.1 Thermostatic controls for each zone. The supply of heating and cooling energy to each space-conditioning zone or dwelling unit shall be controlled by an individual thermostatic control that responds to temperature within the zone and that meets the applicable requirements of Section A6.207.5.2.

• CRC § 25218.5 Medium relevance — show source text

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code.

  SECTION 110.4—MANDATORY REQUIREMENTS FOR POOL AND SPA SYSTEMS AND EQUIPMENT

  (a) Certification by manufacturers. Any pool theater for a pool, spa, or a pool and spa combination shall be installed only if the manufacturer has certified that the system or equipment has all of the following:

  1. Efficiency. Equipment subject to State or federal appliance efficiency standards shall comply with the applicable provisions of Section 110.1; and

  2. On-off switch. A readily accessible on-off switch, mounted on the outside of the heater that allows shutting off the heater without adjusting the thermostat setting; and

  3. Instructions. A permanent, easily readable and weatherproof plate or card that provides the energy efficiency rating and instruction for the energy efficient operation of the pool and/or spa heater; and

  2025 CALIFORNIA ENERGY CODE 53

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  ALL OCCUPANCIES—MANDATORY REQUIREMENTS FOR THE MANUFACTURE, CONSTRUCTION AND INSTALLATION OF SYSTEMS, EQUIPMENT AND BUILDING COMPONENTS

  (b) Installation. Any pool and/or spa system or equipment shall meet the following requirements:

  1. Heating equipment. Equipment installed to heat water for pools and/or spas shall be selected from equipment meeting the standards shown in Table 110.4-A.

  TABLE 110.4-A—HEATING EQUIPMENT STANDARDS	Col2
  HEATING ENERGY SOURCE	STANDARD
  Electric Resistance	UL 1261
  Gas-fired	ANSI Z21.56/CSA 4.7a
  Heat Pump	AHRI 1160 and one of the following: CSA C22.2 No. 236, UL 1995, or UL/CSA 60335-2-40
  Solar	ICC/APSP 902/SRCC 400 for solar pool heaters, ICC 901/SRCC 100 for solar collectors

  2. Piping. At least 18 inches of horizontal or vertical pipe shall be installed between the filter and the heater or dedicated suction and return lines, or built-in or built-up connections shall be installed to allow for the future addition of solar heating equipment;
  3. Covers. Outdoor pools and/or spa with electric or gas heating equipment shall be installed with a pool cover.
  4. Directional inlets and time switches for pools. If the system or equipment is for a pool: i. The pool shall have directional inlets that adequately mix the pool water; and ii. A time switch or similar control mechanism shall be permanently installed as part of a pool water circulation control system that will allow all pumps to be set or programmed to run only during off-peak electric demand period, and for the minimum time necessary to maintain the water in the condition required by applicable public health standards.

  (c) Heating source sizing. Heating systems or equipment for pools and/or spas shall meet one of the sizing requirements 1 through 5 below: 1.

• CRC § 6.5 Medium relevance — show source text

  2. Internal and external insulation with a combined R -value of at least R-16; or

  3. The heat loss of the tank surface based on an 80°F water-air temperature difference shall be less than 6.5 Btu per hour per square foot.

  A6.207.3.3.4 Service water heaters in state buildings. Any newly constructed building constructed by the State shall derive its service water heating from a system that provides at least 60 percent of the energy needed for service water heating from site solar energy or recovered energy.

  Exception: Buildings for which the state architect determines that service water heating from site solar energy or recovered energy is economically or physically infeasible.

  A6.207.4 Natural gas central furnaces, cooking equipment and pool and spa heaters: Pilot lights prohibited.

  Any natural gas system or equipment listed below may be installed only if it does not have a continuously burning pilot light:

  1. Fan-type central furnaces.

  2. Household cooking appliances. Exception: Household cooking appliances without an electrical supply voltage connection and in which each pilot consumes less than 150 Btu/hr.

  3. Pool heaters.

  4. Spa heaters.

  A6.207.5 Controls for space-conditioning systems. Space- conditioning systems shall be installed with controls that comply with the applicable requirements of Subsections A6.207.5.1 through A6.207.5.5.

  A6.207.5.1 Thermostatic controls for each zone. The supply of heating and cooling energy to each space-conditioning zone or dwelling unit shall be controlled by an individual thermostatic control that responds to temperature within the zone and that meets the applicable requirements of Section A6.207.5.2.

  Exception: An independent perimeter heating or cooling system may serve more than one zone without individual thermostatic controls if:

  1. All zones are also served by an interior cooling system;
  2. The perimeter system is designed solely to offset envelope heat losses or gains;

  APPENDIX A6.1-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  APPENDIX A6.1 — VOLUNTARY STANDARDS FOR HEALTH FACILITIES [OSHPD 1, 2 & 4]

  3. The perimeter system has at least one thermostatic control for each building orientation of 50 feet or more; and
  4. The perimeter system is controlled by at least one thermostat located in one of the zones served by the system.

  A6.207.5.2 Criteria for zonal thermostatic controls. The individual thermostatic controls required by Section A6.207.5.1 shall meet the following requirements as applicable:

  1. Where used to control comfort heating, the thermostatic controls shall be capable of being set, locally or remotely, down to 55°F or lower.

  2. Where used to control comfort cooling, the thermostatic controls shall be capable of being set, locally or remotely, up to 85°F or higher.

  3. Where used to control both comfort heating and comfort cooling, the thermostatic controls shall meet Items 1 and 2 and shall be capable of providing a temperature range or dead band of at least 5°F within which the supply of heating and cooling energy to the zone is shut off or reduced to a minimum. Exception: Systems with thermostats that require manual changeover between heating and cooling modes.
• CRC § 150.2 Medium relevance — show source text

  Air seal all accessible areas of the ceiling plane between the attic and the conditioned space in accordance with the requirements in Title 24, Part 6 Section 150.2(b)1Jii.

  Exception 1 to Section A4.204.1.1: Where the capacity of the existing main electrical service panel is insufficient to supply the electrical capacity of a heat pump and where the existing main electrical service panel is sufficient to supply a new or replacement air conditioner, as calculated according to the requirements of California Electrical Code Article 220.83 or 220.87. Documentation of electrical load calculations in accordance with Article 220 must be submitted to the enforcement agency prior to permitting for both the heat pump and proposed air conditioner.

  Exception 2 to Section A4.204.1.1: Where the required capacity of a heat pump to meet the system selection requirements of Section 150.0(h)5 is greater than or equal to 12,000 Btu/h more than the required capacity of an air conditioner to meet the design cooling load. Documentation of heating and cooling load calculations in accordance with 150.0(h) must be submitted to the enforcement agency prior to permitting for both the heat pump and proposed air conditioner.

  A4.204.1.2 Altered pool and/or spa heating for existing multifamily buildings. Alteration of an existing multifamily pool and/or spa heating system shall meet the following:

  Heating source sizing. Heating systems or equipment for pools or spas shall meet one of the sizing requirements of Items 1 through 5 below:

  1. A solar pool heating system with a solar collector surface area that is equivalent to 65 percent or greater of the surface areas of the pool or spa or a combination of both respectively; or
  2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The control for the heat pump pool heater shall meet the requirements specified in Title 24, Part 6, Section 110.4(d). The supplementary heater can be of any energy source; or
  3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy; or
  4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater; or
  5. A pool heating system determined by the Energy Commission Executive Director to use no more energy than the systems specified in Item 1, 2, 3, or 4 above.

  Exception 1 to A4.204.1.2: Portable electric spas compliant with 20 CCR, Section 1605.3(g)(7) of the Appliance Efficiency Regulations.

  Exception 2 to A4.204.1.2: A pool or spa that is heated solely by a solar pool heating system without any supplementary heater.

  Exception 3 to A4.204.1.2: An existing building with inadequate Solar Access Roof Area (SARA) as specified in Title 24, Part 6, Section 170.2(f) for a solar pool heating system to be installed.

  Exception 4 to A4.204.1.2: Heating systems which are used exclusively for permanent spa applications in existing buildings with gas availability.

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25402, 25402.1, 25402.4 and 25402.8, Public Resources Code.

• CRC § 110.12 Medium relevance — show source text

  ** See Section 110.12 for requirements for automatic demand shed controls. H. Economizer fault detection and diagnostics (FDD). All newly installed air handlers with a mechanical cooling capacity over 33,000 Btu/hr and an installed air economizer shall include a stand-alone or integrated fault detection and diagnostics (FDD) system in accordance with Subsections 160.3(a)2Hi through 160.3(a)2Hviii. i. The following temperature sensors shall be permanently installed to monitor system operation: outside air, supply air and, when required for differential economizer operation, a return air sensor; and ii. Temperature sensors shall have an accuracy of ±2°F over the range of 40°F to 80°F; and iii. The controller shall have the capability of displaying the value of each sensor; and iv. The controller shall provide system status by indicating the following conditions: a. Free cooling available; b. Economizer enabled;

  c. Compressor enabled; d. Heating enabled, if the system is capable of heating; and e. Mixed air low limit cycle active. v. The unit controller shall allow manual initiation of each operating mode so that the operation of cooling systems, economizers, fans and heating systems can be independently tested and verified; and vi. Faults shall be reported in one of the following ways: a. Reported to an energy management control system regularly monitored by facility personnel. b. Annunciated locally on one or more zone thermostats, or a device within 5 feet of zone thermostat(s), clearly visible, at eye level and meeting the following requirements:

  2025 CALIFORNIA ENERGY CODE 213

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  MULTIFAMILY BUILDINGS—MANDATORY REQUIREMENTS

  I. On the thermostat, the device or an adjacent written sign, display instructions to contact appropriate building personnel or an HVAC technician; and II. In buildings with multiple tenants, the annunciation shall either be within property management offices or in a common space accessible by the property or building manager. c. Reported to a fault management application that automatically provides notification of the fault to remote HVAC service provider. vii. The FDD system shall detect the following faults: a. Air temperature sensor failure/fault; b. Not economizing when it should; c. Economizing when it should not; d. Damper not modulating; and

  e. Excess outdoor air.

  viii. The FDD system shall be certified to the Energy Commission as meeting the requirements of Sections 160.3(a)2Hi through 160.3(a)2Hvii in accordance with Section 110.0 and JA6.3. Exception to Section 160.3(a)2Hviii: FDD algorithms based in direct digital control systems are not required to be certified to the Energy Commission. I. Direct digital controls (DDC). Direct digital controls to the zone shall be provided as specified by Table 160.3-C. i. The provided DDC system shall meet the control logic requirements of Sections 160.3(a)2E and 160.3(a)2G, and be capable of the following: ii. Monitoring zone and system demand for fan pressure, pump pressure, heating and cooling; iii. Transferring zone and system demand information from zones to air distribution system controllers and from air distribution systems to heating and cooling plant controllers; iv. Automatically detecting the zones and systems that may be excessively driving the reset logic and generate an alarm or other indication to the system operator; v. Readily allow operator removal of zone(s) from the reset algorithm; vi.

• CRC § 120.2 Medium relevance — show source text

  Exception to Section 120.2(g): Zones designed to be conditioned continuously.

  (h) Automatic demand shed controls. See Section 110.12 for requirements for automatic demand shed controls.

  (i) Economizer fault detection and diagnostics (FDD). All newly installed air handlers with a mechanical cooling capacity over 33,000 Btu/hr and an installed air economizer shall include a stand-alone or integrated Fault Detection and Diagnostics (FDD) system in accordance with Subsections 120.2(i)1 through 120.2(i)8.

  1. The following temperature sensors shall be permanently installed to monitor system operation: outside air, supply air, and when required for differential economizer operation a return air sensor, and
  2. Temperature sensors shall have an accuracy of ±2°F over the range of 40°F to 80°F; and
  3. The controller shall have the capability of displaying the value of each sensor; and
  4. The controller shall provide system status by indicating the following conditions: A. Free cooling available; B. Economizer enabled;

  C. Compressor enabled; D. Heating enabled, if the system is capable of heating; and E. Mixed-air low limit cycle active. 5. The unit controller shall allow manual initiation of each operating mode so that the operation of cooling systems, economizers, fans and heating system can be independently tested and verified; and 6. Faults shall be reported in one of the following ways: A. Reported to an Energy Management Control System regularly monitored by facility personnel. B. Annunciated locally on one or more zone thermostats, or a device within five (5) feet of zone thermostat(s), clearly visible, at eye level, and meeting the following requirements: i. On the thermostat, device, or an adjacent written sign, display instructions to contact appropriate building personnel or an HVAC technician; and ii. In buildings with multiple tenants, the annunciation shall either be within property management offices or in a common space accessible by the property or building manager. C. Reported to a fault management application which automatically provides notification of the fault to a remote HVAC service provider. 7. The FDD system shall detect the following faults: A. Air temperature sensor failure/fault; B. Not economizing when it should; C. Economizing when it should not; D. Damper not modulating; and

  E. Excess outdoor air.

  8. The FDD System shall be certified to the Energy Commission as meeting requirements of Subsections 120.2(i)1 through 120.2(i)7 in accordance with Section 110.0 and JA6.3. Exception to Section 120.2(i)8: FDD algorithms based in direct digital control systems are not required to be certified to the Energy Commission.

  74 2025 CALIFORNIA ENERGY CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL, HOTEL/MOTEL OCCUPANCIES, AND COVERED PROCESSES—MANDATORY REQUIREMENTS

  (j) Direct Digital Controls (DDC) . Direct Digital Controls to the zone shall be provided as specified by Table 120.2-A. The provided DDC system shall meet the control logic requirements of Sections 120.1(d), 110.12(a) and 110.12(b), and be capable of the following:

  The provided DDC system shall meet the control logic requirements of Sections 110.12(a), 110.12(b) and 120.1(d) and be capable of the following:

  1. Monitoring zone and system demand for fan pressure, pump pressure, heating and cooling;
• CRC § 503.3.5 Medium relevance — show source text

  L 503.3.5 Service Water Heating System Con- trols. Service water heating system controls shall comply with Section L 503.3.5(1) and Section L 503.3.5(2).

  (1) Temperature controls shall be provided that allow for storage temperature adjustment from 120°F (49°C) or lower to a maximum temperature compatible with the intended use.

  Exception: Where the manufacturer’s installation instructions specify a higher minimum thermostat setting to minimize condensation and resulting corrosion. [ASHRAE 90.1:7.4.4.1]

  (2) Temperature controlling means shall be provided to limit the maximum temperature of water delivered from lavatory faucets in public facility restrooms to 110°F (43°C). [ASHRAE 90.1:7.4.4.3]

  L 503.3.6 Pools. Pool heating systems shall comply with Section L 503.3.6(1) through Section L 503.3.6(3).

  2025 CALIFORNIA PLUMBING CODE 511

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  APPENDIX L

  (1) Pool heaters shall be equipped with a readily accessible ON/OFF switch to allow shutting off the heater without adjusting the thermostat setting. Pool heaters fired by natural gas shall not have continuously burning pilot lights. [ASHRAE 90.1:7.4.5.1] (2) Heated pools shall be equipped with a vapor retardant pool cover on or at the water surface. Pools heated to more than 90°F (32°C) shall have a pool cover with a minimum insulation value of R-12.

  Exception: Pools that are deriving over 60 percent of the energy for heating from site-recovered energy or on-site renewable energy. [ASHRAE 90.1:7.4.5.2] (3) Time switches shall be installed on swimming pool heaters and pumps. Exceptions: (1) Where public health standards require 24-hour pump operation. (2) Where pumps are required to operate solar and waste heat recovery pool heating systems.

  [ASHRAE 90.1:7.4.5.3] L 503.3.7 Heat Traps. Vertical pipe risers serving storage water heaters and storage tanks not having integral heat traps and serving a nonrecirculating system shall have heat traps on both the inlet and outlet piping as close as practical to the storage tank. A heat trap is a means to counteract the natural convection of heated water in a vertical pipe run. The means is either of the following: (1) A device specifically designed for the purpose or an arrangement of tubing that forms a loop of 360 degrees (6.28 rad). (2) Piping that, from the point of connection to the water heater (inlet or outlet) includes a length of piping directed downward before connection to the vertical piping of the supply water or hot-water distribution system, as applicable. [ASHRAE 90.1:7.4.6] L 503.4 Prescriptive Path. The prescriptive path for space or water heating efficiency shall comply with Section L 503.4.1 through Section L 503.4.5. L 503.4.1 Space Heating and Service Water Heat- **ing.