Can a fuel-burning water heater be installed in a bedroom or bathroom?

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

• CPC § 504.0 High relevance — show source text

  No appliance or part thereof shall be covered or concealed until the same has been inspected and approved by the Authority Having Jurisdiction.

  504.0 Water Heater Requirements.

  504.1 Location. Water heater installations in bedrooms and

  bathrooms shall comply with one of the following [NFPA 54:10.27.1]:

  (1) Water heater shall be of the direct-vent type. [NFPA 54:10.27.1(2)]

  (2) Fuel-burning water heaters shall be permitted to be installed in a closet located in the bedroom or bathroom provided the closet is equipped with a listed, gasketed door assembly and a listed self-closing device. The selfclosing door assembly shall meet the requirements of Section 504.1.1. The door assembly shall be installed with a threshold and bottom door seal and shall meet the requirements of Section 504.1.2. Combustion air for such installations shall be obtained from the outdoors in accor dance with Section 506.4. The closet shall be for the

  exclusive use of the water heater.

  504.1.1 Self-Closing Doors. Self-closing doors shall swing easily and freely, and shall be equipped with a self-closing device to cause the door to close and latch each time it is opened. The closing mechanism shall not have a hold-open feature.

  504.1.2 Gasketing. Gasketing on gasketed doors or frames shall be furnished in accordance with the published listings of the door, frame, or gasketing material manufacturer.

  TABLE 501.1(2) FIRST HOUR RATING [1]

  Number of Bathrooms	1 to 1.5	Col3	Col4	2 to 2.5	Col6	Col7	Col8	3 to 3.5	Col10	Col11	Col12
  Number of Bedrooms	1	2	3	2	3	4	5	3	4	5	6
  First Hour Rating,2 Gallons	38	49	49	49	62	62	74	62	74	74	74

  For SI units: 1 gallon = 3.785 L

  Notes: 1 The first-hour rating is found on the “Energy Guide” label. 2 Solar water heaters shall be sized to meet the appropriate first-hour rating as shown in the table.

  2025 CALIFORNIA PLUMBING CODE 83

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  WATER HEATERS

  Exception: Where acceptable to the Authority Having Jurisdiction, gasketing of non-combustible or limitedcombustible material shall be permitted to be applied to the frame, provided closing and latching of the door are not inhibited.

  504.2 Vent. Water heaters of other than the direct-vent type shall be located as close as practical to the chimney or gas vent. 504.3 Clearance. The clearance requirements for water heaters shall comply with Section 504.3.1 or Section 504.3.2.

  504.3.1 Listed Water Heaters. The clearances shall not be such as to interfere with combustion air, draft hood clearance and relief, and accessibility for servicing.

• CPC § 0.293 High relevance — show source text

  For SI units: 1000 British thermal units per hour = 0.293 kW

  • Dual purpose water heaters shall be installed in accordance with this code and the manufacturer’s installation instructions.

  501.2 California Energy Code Water Heating System Requirements. [CEC] See California Energy Code Section 110.3 for additional mandatory requirements for all service water heating systems, and 150.0(n) for additional mandatory requirements for residential service water heating systems.

  502.0 Permits.

  502.1 General. It shall be unlawful for a person to install, remove, or replace or cause to be installed, removed, or replaced a water heater without first obtaining a permit from the Authority Having Jurisdiction to do so.

  TABLE 501.1(1)

  WATER HEATERS

  For SI units: 1000 British thermal units per hour = 0.293 kW

  • Dual purpose water heaters shall be installed in accordance with this code and the manufacturer’s installation instructions.

  503.0 Inspection.

  503.1 Inspection of Chimneys or Vents. This inspection shall be made after chimneys, vents, or parts thereof, authorized by the permit, have been installed and before such vent or part thereof has been covered or concealed.

  503.2 Final Water Heater Inspection. This inspection shall be made after work authorized by the permit has been installed. The Authority Having Jurisdiction will make such inspection as deemed necessary to be assured that the work has been installed in accordance with the intent of this code.

  No appliance or part thereof shall be covered or concealed until the same has been inspected and approved by the Authority Having Jurisdiction.

  504.0 Water Heater Requirements.

  504.1 Location. Water heater installations in bedrooms and

  bathrooms shall comply with one of the following [NFPA 54:10.27.1]:

  (1) Water heater shall be of the direct-vent type. [NFPA 54:10.27.1(2)]

  (2) Fuel-burning water heaters shall be permitted to be installed in a closet located in the bedroom or bathroom provided the closet is equipped with a listed, gasketed door assembly and a listed self-closing device. The selfclosing door assembly shall meet the requirements of Section 504.1.1. The door assembly shall be installed with a threshold and bottom door seal and shall meet the requirements of Section 504.1.2. Combustion air for such installations shall be obtained from the outdoors in accor dance with Section 506.4. The closet shall be for the

  exclusive use of the water heater.

  504.1.1 Self-Closing Doors. Self-closing doors shall swing easily and freely, and shall be equipped with a self-closing device to cause the door to close and latch each time it is opened. The closing mechanism shall not have a hold-open feature.

  504.1.2 Gasketing. Gasketing on gasketed doors or frames shall be furnished in accordance with the published listings of the door, frame, or gasketing material manufacturer.

  TABLE 501.1(2) FIRST HOUR RATING [1]

• CPC § 2.32 High relevance — show source text

  shall be listed in accordance with ANSI Z21.86/CSA 2.32 or CSA/ANSI Z21.88/CSA 2.33. [NFPA 54:10.21.1.1]

  915.1.2 Unvented Room Heaters. Unvented room

  heaters shall be listed in accordance with CSA/ANSI

  Z21.11.2. [NFPA 54:10.21.1.2]

  915.2 Electric Room Heaters. Electric room heaters shall comply with UL 2021.

  915.3 Gas-Fired Room Heaters. Gas-fired room heaters shall comply with Section 915.3.1 through Section 915.3.4. 915.3.1 Prohibited Installations. Unless specifically permitted by the Authority Having Jurisdiction, unvented room heaters shall not be installed as primary heat sources. Unvented room heaters shall not be permitted in spaces that do not have the required volume of indoor air as defined in Section 701.4.

  [HCD 1 & HCD 2] Unvented fuel-burning room heaters shall not be installed, used, maintained, or permitted to exist in a Group R Occupancy.

  915.3.1.1 Unvented Room Heaters. Unvented

  room heaters shall not be installed in bathrooms or

  bedrooms.

  Exceptions:

  (1) Where approved, one listed wall-mounted unvented room heater equipped with an oxygen depletion safety shutoff system shall be permitted to be installed in a bathroom, provided that the input rating does not exceed 6000 Btu/h (1.76 kW) and combustion and ventilation air is provided as specified in Section 902.2.

  (2) Where approved, one listed wall-mounted unvented room heater equipped with an oxygen depletion safety shutoff system shall be permitted to be installed in a bedroom, provided that the input rating does not exceed 10 000 Btu/h (3 kW) and combustion and ventilation air is provided as specified in Section 902.2. [NFPA 54:10.21.2]

  (3) Portable oil fired unvented heating appliances used as supplemental heating in storage occupancies, utility occupancies, and in accordance with the fire code.

  [HCD 1 & HCD 2] Unvented fuel-burning room heaters shall not be installed, used, maintained, or permitted to exist in a Group R Occupancy.

  915.3.2 Installations in Institutions. Room heaters shall not be installed in the following occupancies:

  (1) Residential board and care

  (2) Health care [NFPA 54:10.21.3] 915.3.3 Clearance. A room heater shall be placed so as not to cause a hazard to walls, floors, curtains, furniture, doors where open, and to the free movements of persons within the room. Heaters designed and marked, “For use in noncombustible fireplace only,” shall not be installed elsewhere. Listed room heaters shall be installed in accordance with their listings and the manufacturer’s installation instructions. In no case shall the clearances be

  2025 CALIFORNIA MECHANICAL CODE 207

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  INSTALLATION OF SPECIFIC APPLIANCES

• CPC § 902.2. High relevance — show source text

  (2) Where approved, one listed wall-mounted unvented room heater equipped with an oxygen depletion safety shutoff system shall be permitted to be installed in a bedroom, provided that the input rating does not exceed 10 000 Btu/h (3 kW) and combustion and ventilation air is provided as specified in Section 902.2. [NFPA 54:10.21.2]

  (3) Portable oil fired unvented heating appliances used as supplemental heating in storage occupancies, utility occupancies, and in accordance with the fire code.

  [HCD 1 & HCD 2] Unvented fuel-burning room heaters shall not be installed, used, maintained, or permitted to exist in a Group R Occupancy.

  915.3.2 Installations in Institutions. Room heaters shall not be installed in the following occupancies:

  (1) Residential board and care

  (2) Health care [NFPA 54:10.21.3] 915.3.3 Clearance. A room heater shall be placed so as not to cause a hazard to walls, floors, curtains, furniture, doors where open, and to the free movements of persons within the room. Heaters designed and marked, “For use in noncombustible fireplace only,” shall not be installed elsewhere. Listed room heaters shall be installed in accordance with their listings and the manufacturer’s installation instructions. In no case shall the clearances be

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  INSTALLATION OF SPECIFIC APPLIANCES

  (1) A listed unit heater shall be installed with clearances from combustible material at the back and one side of not less than 6 inches (152 mm). Where the flue gases are vented horizontally, the 6 inch (152 mm) clearance shall be measured from the draft hood or

  vent instead of the rear wall of the unit heater. A unit

  heater listed for reduced clearances shall be installed in accordance with its listing and the manufacturer’s installation instructions.

  (2) Floor-mounted-type unit heaters installed on combustible floors shall be listed for such installation.

  (3) Combustible floors under unlisted floor-mounted unit heaters shall be protected in an approved man ner.

  (4) Clearances for servicing shall be in accordance with the manufacturer’s instructions.

  916.4 Combustion and Circulating Air. Combustion and circulating air shall be provided in accordance with Section 701.0. [NFPA 54:10.24.4]

  916.5 Ductwork. A unit heater shall not be attached to a warm air duct system unless listed and marked for such installation. [NFPA 54:10.24.5] 916.6 Installation in Commercial Garages and Air- craft Hangars. Unit heaters installed in garages for more than three motor vehicles or in aircraft hangars shall be installed in accordance with Section 303.11 and Section 303.12. [NFPA 54:10.24.6]

  916.7 Oil-Fired Unit Heaters. Oil-fired unit heaters shall comply with UL 731 and installed in accordance with the manufacturer’s installation instructions.

  917.0 Food Service Appliance, Floor-Mounted. 917.1 Application. Floor-mounted food service appliances shall be listed in accordance with ANSI Z83.11/CSA 1.8.

• CPC § 911.0 High relevance — show source text

  2||||||||||X|X|X||X|X|||||||||| |911.0||||||||||||||||||X||||||| |911.2||||||||||X|X|X||X|X|||||||||| |912.3(1)||||X|X|||||||||||||||||||| |915.3.1||||X|X|||||||||||||||||||| |915.3.1.1||||X|X|||||||||||||||||||| |929.0||||†|†|||||||||||||||||||| |929.1||||†|†||||||||||||||||||||

  This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

  2025 CALIFORNIA MECHANICAL CODE 197

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  CHAPTER 9

  INSTALLATION OF SPECIFIC APPLIANCES

  901.0 General.

  901.1 Applicability. This chapter addresses requirements for the design, construction, and installation of specific appliances. In addition to the requirements of this chapter, appliances shall comply with the general requirements of Chapter 3.

  902.0 General.

  902.1 Nonindustrial Appliances. This chapter is applicable primarily to nonindustrial-type appliances and installations and, unless specifically indicated, does not apply to industrial-type appliances and installations. Listed appliances shall be installed in accordance with their listing and the manufacturer’s installation instructions or, as elsewhere specified in this chapter, as applicable to the appliance. Unlisted appliances shall be installed as specified in this part as applicable to the appliances.

  902.2 Combustion Air from Bedroom or Bathroom. Appliances shall not be installed so their combustion, ventilation, and dilution air are obtained only from a bedroom or bathroom unless the bedroom or bathroom has the required volume in accordance with Section 701.4. [NFPA 54:10.1.2]

  [OSHPD 1, 1R, 2, 4 & 5] Warm air furnaces shall not be installed under openable windows on exterior walls. 902.3 Added or Converted Appliances. When additional or replacement appliances or equipment is installed or an appliance is converted to gas from another fuel, the location in which the appliances or equipment is to be operated shall be checked to verify the following:

  (1) Air for combustion and ventilation is provided where required, in accordance with the provisions of Section 701.0. Where existing facilities are not adequate, they shall be upgraded to meet Section 701.0 specifications.

  (2) The installation components and appliances meet the clearances to combustible material provisions of Section 303.10. It shall be determined that the installation and operation of the additional or replacement appliances do not render the remaining appliances unsafe for continued operation.

  (3) The venting system is constructed and sized in accordance with the provisions of Section 802.0.

• CPC § 6.9 Medium relevance — show source text

  B. A single 240 volt HPWH that meets the requirements of NEEA Advanced Water Heater Specification Tier 3 or higher. In addition, for Climate Zone 16, a drain water heat recovery system that is field verified as specified in Reference Appendix RA3.6.9 and the storage tank shall be located in the garage or conditioned space. C. A solar water-heating system with electric backup meeting the installation criteria specified in Reference Residential Appendix RA4 and with a minimum annual solar savings fraction of 0.7. Exception 1 to Section 150.1(c)8: An electric water heater with point of use distribution as specified in RA4.4.5 may be installed for new dwelling units with a conditioned floor area of 500 square feet or less. Exception 2 to Section 150.1(c)8A and B: A 120V HPWH may be installed in place of a 240V HPWH for new dwelling unit with one bedroom or fewer.

  9. Space-conditioning distribution systems. All space-conditioning systems shall meet all applicable requirements of A or B below:

  A. High performance attics. Air handlers or ducts are allowed to be in ventilated attic spaces when the roof and ceiling insulation level meet Option B in Table 150.1-A. Duct insulation levels shall meet the requirements in Table 150.1-A. B. Duct systems and air handlers of HVAC systems shall be located entirely in conditioned space and confirmed through field verification and diagnostic testing to meet the criterion of Reference Residential Appendix Section RA3.1.4.3.8. Duct insulation levels shall meet the requirements in Table 150.1-A. For dwelling units with attics, the duct system and air handlers of HVAC systems shall be located below the ceiling separating the occupiable space from the attic. Note: Gas heating appliances installed in conditioned spaces must meet the combustion air requirements of the California Mechanical Code Chapter 7, as applicable. 10. Central fan integrated ventilation systems. Central forced air system fans used to provide outside air shall have an airhandling unit fan efficacy less than or equal to the maximum W/cfm specified in A, B or C. The airflow rate and fan efficacy requirements in this section shall be confirmed through field verification and diagnostic testing in accordance with all applicable procedures specified in Reference Residential Appendix RA3.3. Central fan integrated ventilation systems shall be certified to the Energy Commission as intermittent ventilation systems as specified in Reference Residential Appendix RA3.7.4.2.

  A. 0.45 W/cfm for gas furnace air-handling units. B. 0.58 W/cfm for air-handling units that are not gas furnaces. C. 0.62 W/cfm for small-duct high-velocity air-handling units. Exception to Section 150.1(c)10A: Gas furnace air-handling units manufactured prior to July 3, 2019 shall comply with a fan efficacy value less than or equal to 0.58 w/cfm as confirmed by field verification and diagnostic testing in accordance with the procedures given in Reference Residential Appendix RA3.3. 11. Roofing products. All roofing products shall meet the requirements of Section 110.8 and the applicable requirements of Subsection A or B:

• CPC § 170.1. Medium relevance — show source text

  000|≥10,000|≥5,000|≥5,000|≥2,000|≥2,000|≥2,000|≥2,000|≥2,000| |≥60% and <70%|≥2,000|≥2,000|≥6,000|≥6,000|≥6,000|NR|NR|≥18,000|≥9,000|≥4,000|≥4,000|≥2,000|≥2,000|≥2,000|≥2,000|≥2,000| |≥70% and <80%|≥2,000|≥2,000|≥6,000|≥5,000|≥5,000|NR|NR|≥15,000|≥8,000|≥3,000|≥3,000|≥2,000|≥2,000|≥2,000|≥2,000|≥2,000| |≥80%|≥2,000|≥2,000|≥6,000|≥5,000|≥5,000|NR|NR|≥12,000|≥7,000|≥3,000|≥3,000|≥2,000|≥2,000|≥2,000|≥2,000|≥2,000|

  256 2025 CALIFORNIA ENERGY CODE

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

  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  (d) Domestic hot water systems. Water-heating systems shall meet the applicable requirements of 1 or 2 below:

  1. Individual systems. For systems serving individual dwelling units, the water-heating system shall meet the requirement of either A or B, or shall meet the performance compliance requirements of Section 170.1. For recirculation distribution systems serving individual dwelling units, only demand recirculation systems with manual on/off control as specified in the Reference Appendix RA4.4.9 shall be used. A. A single 240 volt heat pump water heater. In addition, meet the following: i. A compact hot water distribution system as specified in Reference Appendix RA4.4.6 in Climate Zones 1 and 16; and

  ii. A drain water heat recovery system that is field verified as specified in the Reference Appendix RA3.6.9 in Climate Zone 16.

  B. A single heat pump water heater that meets the requirements of NEEA Advanced Water Heater Specification Tier 3 or higher. In addition, for Climate Zone 16, a drain water heat recovery system that is field verified as specified in Reference Appendix RA3.6.9. Exception 1 to Section 170.2(d)1: Multifamily buildings four habitable stories or greater may install a gas or propane instantaneous water heater with an input of 200,000 Btu per hour or less and no storage tank. Exception 2 to Section 170.2(d)1: A 120V HPWH may be installed in place of a 240V HPWH for new dwelling units with one bedroom or less.

  2. **Central systems.
• CPC § 902.0 Medium relevance — show source text

  902.0 General.

  902.1 Nonindustrial Appliances. This chapter is applicable primarily to nonindustrial-type appliances and installations and, unless specifically indicated, does not apply to industrial-type appliances and installations. Listed appliances shall be installed in accordance with their listing and the manufacturer’s installation instructions or, as elsewhere specified in this chapter, as applicable to the appliance. Unlisted appliances shall be installed as specified in this part as applicable to the appliances.

  902.2 Combustion Air from Bedroom or Bathroom. Appliances shall not be installed so their combustion, ventilation, and dilution air are obtained only from a bedroom or bathroom unless the bedroom or bathroom has the required volume in accordance with Section 701.4. [NFPA 54:10.1.2]

  [OSHPD 1, 1R, 2, 4 & 5] Warm air furnaces shall not be installed under openable windows on exterior walls. 902.3 Added or Converted Appliances. When additional or replacement appliances or equipment is installed or an appliance is converted to gas from another fuel, the location in which the appliances or equipment is to be operated shall be checked to verify the following:

  (1) Air for combustion and ventilation is provided where required, in accordance with the provisions of Section 701.0. Where existing facilities are not adequate, they shall be upgraded to meet Section 701.0 specifications.

  (2) The installation components and appliances meet the clearances to combustible material provisions of Section 303.10. It shall be determined that the installation and operation of the additional or replacement appliances do not render the remaining appliances unsafe for continued operation.

  (3) The venting system is constructed and sized in accordance with the provisions of Section 802.0. Where the existing venting system is not adequate, it shall be upgraded to comply with Section 802.0. [NFPA 54:9.1.2] 902.4 Type of Gas(es). The appliance shall be connected to the fuel gas for which it was designed. No attempt shall be made to convert the appliance from the gas specified on the rating plate for use with a different gas without consulting the installation instructions, the serving gas supplier, or the appliance manufacturer for complete instructions. Listed appliances shall not be converted unless permitted by and in accordance with the manufacturer’s installation instructions. [NFPA 54:9.1.3] 902.5 Safety Shutoff Devices for Unlisted LP-Gas Appliances Used Indoors. Unlisted appliances for use

  with undiluted LP-Gases and installed indoors, except attended laboratory equipment, shall be equipped with safety shutoff devices of the complete shutoff type. [NFPA 54:9.1.4] 902.6 Fuel Input Rate. The fuel input rate to the appliance shall not be increased or decreased in violation of the approved rating at the altitude where it is being used. 902.7 Use of Air or Oxygen Under Pressure. Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a back pressure regulator and relief valve shall be provided to prevent air or oxygen from passing back into the gas piping. Where oxygen is used, installation shall be in accordance with NFPA 51. [NFPA 54:9.1.5] 902.8 Appliance Support. Appliances and equipment shall be furnished either with load-distributing bases or with a sufficient number of supports to prevent damage to either the building structure or the appliance and the equipment.

• CPC § 6.1507 Medium relevance — show source text

  LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
  2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
  Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
  where× = Condenser DT + LIFT
  COPadj = Kadj * COPstd|

  A6.207.1.2 Controls for heat pumps with supplementary electric resistance heaters. Heat pumps with supplementary electric resistance heaters shall have controls:

  A6.207.1.2.1 That prevent supplementary heater operation when the heating load can be met by the heat pump alone; and

• CPC § 509.3 Medium relevance — show source text

  Area 509.3 Occupancy classification 509.2 Separation and protection 509.4 Incinerator Rooms Table 509.1, 713.13,

  1006.2.2.1 Industrial [see Factory Occupancy (see Group F)] Inflatable Amusement Device

  Definition 202 Inspections 110, 1704, 1705 Alternative methods and materials

  1705.1.1

  Sprinkler protection 415.11.10.1, 415.11.11, 415.11.6.4, 415.11.9, 415.4, 705.9.1, 903.2.5 Standby, emergency power 2702.2 Storage 413, 414.1, 414.2.5, 414.5, 414.6, 415.6, Table 415.6.5, 415.7.1, 415.9.1, 426.1 Unlimited area 507.10, 507.8, 507.9 Headroom 406.2.2, 505.2, 1003.2, 1003.3, 1010.1.1, 1010.1.1.1, 1011.3, 1012.5.2,

  1208.2 Health Care (see Institutional I-1 and Institutional I-2) Ambulatory care facilities 422 Clinic, outpatient 304.1 Hospitals 308.3 Health-hazard Materials 307.2, Table 414.2.5.1, 415.2

  Heat Vents 910 Heating (see Mechanical) 101.4.2 Aircraft hangars 412.3.4 Fire pump rooms 913.3 Fireplace 2111 Masonry heaters 2112 Parking garages 406.2.9 Repair garages 406.2.9 Height, Building 503, 504, 505, 508, 510 Limitations 503 Mixed construction types 510 Modifications 504 Roof structures 504.3, 1511 Helical Pile 1810.3.1.5, Table 1810.3.2.6, 1810.3.5.3.5, 1810.4.11 Heliport Live loads 1607.6 Higher Education Laboratories 428 High-Piled Combustible Storage 413, 907.2.16, 910.2.2 High-Pressure Decorative Exterior-Grade Compact Laminates 1408 High-Rise Buildings 403 Alarms and detection 403.4.1, 403.4.2,

  907.2.14

  Application 403.1 Construction 403.2

• CPC § 9.3 Medium relevance — show source text

  [9.3] American Society of Mechanical Engineers (ASME), 2012, ASME B31.4-2012 (ASME B31.4), “Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids,” New York.

  [9.4] California Code of Regulations (CCR), Title 2, Division 3, Chapter 1, Article 5.5 – Marine Terminal Oil Pipelines (2 CCR 2560 et seq.)

  [9.5] American Society of Mechanical Engineers (ASME), 2008, ASME B31E, “Standard for the Seismic Design and Retrofit of Above- Ground Piping Systems,” New York.

  [9.6] American Society of Civil Engineers, 2011, “Guidelines for Seismic Evaluation and Design of Petrochemical Facilities,” 2nd ed., New York.

  [9.7] CalARP Program Seismic Guidance Committee, December 2013, “Guidance for California Accidental Release Prevention (CalARP) Program Seismic Assessments,” Sacramento, CA.

  [9.8] American Petroleum Institute (API), 2009, API Standard 609, “Butterfly Valves: Double Flanged, Lug- and Wafer-Type,” 7th ed., Washington, D.C.

  [9.9] American Society of Mechanical Engineers (ASME), 2013, ASME B16.34-2013 (ASME B16.34), “Valves Flanged Threaded and Welding End,” New York.

  [9.10] American Petroleum Institute (API), 2010, API Standard 607, “Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic Seats,” 6th ed., Washington, D.C.

  [9.11] American Petroleum Institute (API), API Recommended Practice 520 P1 and P2 (API 520), “Sizing, Selection, and Installation of Pressure-relieving Devices, Part 1 —Sizing and Selection,” 2014, 9th ed., and “Sizing, Selection, and Installation of Pressure- Relieving Devices in Refineries – Part 2 – Installation,” 2015, 6th ed., Washington, D.C.

  [9.12] Code of Federal Regulations (CFR), Title 33, Section 154.2100 – Vapor Control System, General (33 CFR 154.2100)

  [9.13] National Fire Protection Association (NFPA), NFPA 11, “Standard for Low-, Medium-, and High-Expansion Foam,” Quincy, MA. For edition, see California Code of Regulations (CCR), Title 24, Part 2, Chapter 35 – Referenced Standards.

  [9.14] National Fire Protection Association (NFPA), NFPA 24, “Standard for the Installation of Private Fire Service Mains and Their Appurtenances,” Quincy, MA. For edition, see California Code of Regulations (CCR), Title 24, Part 2, Chapter 35 – Referenced Standards.

  [9.15] American Society of Mechanical Engineers (ASME), 2013, ASME B16.5-2013 (ASME B16.5), “Pipe Flanges and Flanged Fittings,” New York.

  [9.16] American Society of Mechanical Engineers (ASME), 2007, ASME A13.1-2007 (R2013) (ASME A13.1), “Scheme for the Identification of Piping Systems,” New York.

  Authority: Sections 8750 through 8760, Public Resources Code.

• CPC § 170.1. Medium relevance — show source text

  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  (d) Domestic hot water systems. Water-heating systems shall meet the applicable requirements of 1 or 2 below:

  1. Individual systems. For systems serving individual dwelling units, the water-heating system shall meet the requirement of either A or B, or shall meet the performance compliance requirements of Section 170.1. For recirculation distribution systems serving individual dwelling units, only demand recirculation systems with manual on/off control as specified in the Reference Appendix RA4.4.9 shall be used. A. A single 240 volt heat pump water heater. In addition, meet the following: i. A compact hot water distribution system as specified in Reference Appendix RA4.4.6 in Climate Zones 1 and 16; and

  ii. A drain water heat recovery system that is field verified as specified in the Reference Appendix RA3.6.9 in Climate Zone 16.

  B. A single heat pump water heater that meets the requirements of NEEA Advanced Water Heater Specification Tier 3 or higher. In addition, for Climate Zone 16, a drain water heat recovery system that is field verified as specified in Reference Appendix RA3.6.9. Exception 1 to Section 170.2(d)1: Multifamily buildings four habitable stories or greater may install a gas or propane instantaneous water heater with an input of 200,000 Btu per hour or less and no storage tank. Exception 2 to Section 170.2(d)1: A 120V HPWH may be installed in place of a 240V HPWH for new dwelling units with one bedroom or less.

  2. Central systems. For systems serving multiple dwelling units, the water-heating system shall meet the applicable requirement of A through F, or shall meet the performance compliance requirements of Section 170.1: A. For heat pump water-heating systems serving multiple dwelling units, the water-heating system shall be installed according to the manufacturer’s design and installation guidelines and meet the following requirements, or meet the requirements of NEEA Advanced Water Heater Specification for commercial heat pump water heater Tier 2 or higher: i. The primary heat pump water heater shall be a single-pass heat pump water heater. ii. The hot water return from the recirculation loop shall connect to a recirculation loop tank and shall not directly connect to the primary heat pump water heater inlet or the primary thermal storage tanks. iii. The fuel source for the recirculation loop tank shall be electricity. iv. The primary storage tank temperature setpoint shall be at least 135°F. v. The recirculation loop tank temperature setpoint shall be at least 10°F lower than the primary thermal storage tank temperature setpoint. vi. The minimum heat pump water heater compressor cut-off temperature shall be equal to or lower than 40°F ambient air temperature. vii. Design documentation shall be provided in accordance with JA14.4. B. For gas or propane systems serving multiple dwelling units, the water-heating system that includes the following components shall be installed: i. For Climate Zones 1 through 9, gas service water-heating systems with a total installed gas water-heating input capacity of 1 MMBtu/h or greater shall have gas service water-heating equipment with a minimum thermal efficiency of 90 percent. Multiple units are allowed to meet this requirement with an input capacity-weighted average of at least 90 percent.