California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 20 - Flammable Liquids, Gases and Vapors
Article 144 - Service Stations
Section 5575 - Heating Equipment

(a) Heating equipment may be installed in the conventional manner except as provided in (b), (c), (d), or (e).

(b) Heating equipment may be installed in a special room separated from an area classified as Division 1 or Division 2 in Sections 5530(d) and 5574(c) by walls having a fire-resistance rating of at least one hour and without any openings in the walls within 8 feet of the floor into an area classified as Division 1 or Division 2. This room shall not be used for combustible storage, and all air for combustion purposes shall come from outside the building.

(c) Heating equipment using gas or oil fuel may be installed in the lubrication or service room where there is no dispensing or transferring of Category 1 or 2 flammable liquids or 3 flammable liquids with a flashpoint below 100 °F (37.8 °C), provided the bottom of the combustion chamber is at least 18 inches above the floor and the heating equipment is protected from physical damage.

(d) Heating equipment using gas or oil fuel listed for use in garages may be installed in the lubrication or service room where Category 1 or 2 flammable liquids, or Category 3 flammable liquids with a flashpoint below 100 °F (37.8 °C), are dispensed provided the equipment is installed at least 8 feet above the floor.

(e) Electrical heating equipment shall conform to Section 5574. (Title 24, T8-5575)