CA Health & Safety Code § 17921.1 (2021)
2021 California Code|Health and Safety Code - HSC|DIVISION 13 - HOUSING|PART 1.5 - REGULATION OF BUILDINGS USED FOR HUMAN HABITATION|CHAPTER 2 - Rules and Regulations|Section 17921.1.

17921.1.  Notwithstanding the provisions of Section 17921, and except as provided for herein, the department shall not adopt or enforce any rule or regulation relating to the installation, maintenance, or use of a hotplate in a room of any building occupied on or prior to the effective date of this act, if all of the following conditions exist:(a)  The hotplate is used solely for the cooking or preparation of meals for consumption by not more than two occupants of the room. (b)  The hotplate contains not more than two burners or heating elements, and has been approved by a testing agency acceptable to the department. (c)  The installation, maintenance, or use of a hotplate will not be, or is not, hazardous to life or property. (d)  The hotplate rests on its own legs, is set not closer than six inches from any wall or projection thereof, and rests on an impervious surface. (e)  The walls behind and adjacent to the hotplate are lined or backflashed with incombustible material equivalent to one-fourth-inch asbestos millboard; the backflashing extends from 12 inches below to 24 inches above the base of the hotplate; and there is 36 inches of clear and unobstructed space above the surface of the hotplate. (f)  The area of such room is not less than 120 square feet in superficial floor area. (g)  The room contains an approved sink with hot and cold running water. (h)  All plumbing in the room complies with the provisions of this part and building standards published in the State Building Standards Code. (i)  An approved storage cabinet is installed in the room wherein all food, dishes, and cooking and eating utensils are stored when not in use. (j)  The bed, and any drapes, curtains, towels, or other readily combustible materials, in the room are located so that they do not come in contact with the hotplate. (k)  The room complies with the provisions of this part and building standards published in the State Building Standards Code pertaining to window area, ventilation, ceiling height, and cubic airspace. (l)  An approved method of heating is installed in or for the room and the hotplate is not used for the purpose of heating the room or installed within an unventilated area. (m)  Toilet and bath facilities are installed and maintained in the building as required by this part and building standards published in the State Building Standards Code. In the event of any structural addition or any alteration or reconstruction involving the floor area of any room the provisions of Section 17921 shall apply. Any city or county may enact an ordinance to prohibit the installation, maintenance, or use of a hotplate in any room.“Approved,” when used in connection with any material, type of construction, or appliance in this section, means meeting the approval of the enforcement agency as the result of investigation and tests conducted by the agency or by reason of accepted principles or tests by national authorities, technical, health, or scientific organizations or agencies.(Amended by Stats. 1979, Ch. 1152.)