Section 18031.7 Of Chapter 4. Standards From California Health And Safety Code >> Division 13. >> Part 2. >> Chapter 4.

. (a) Nothing in this part shall prohibit the replacement of water heaters in manufactured homes or mobilehomes with fuel-gas-burning water heaters not specifically listed for use in a manufactured home or mobilehome or from having hot water supplied from an approved source within the manufactured home or mobilehome, or in the garage, in accordance with this part or Part 2.1 (commencing with Section 18200).
  (b) Nothing in this part shall prohibit the replacement of appliances for comfort heating in manufactured homes, mobilehomes, or multifamily manufactured homes with fuel-gas appliances for comfort heating not specifically listed for use in a manufactured home or mobilehome within the manufactured home, mobilehome, or multifamily manufactured home in accordance with this part, Part 2.1 (commencing with Section 18200), or Part 2.3 (commencing with Section 18860).
  (c) Replacement fuel-gas-burning water heaters shall be listed for residential use and installed within the specifications of that listing to include tiedown or bracing to prevent overturning.
  (d) Replacement fuel-gas-burning water heaters installed in accordance with subdivision (c) shall bear a label permanently affixed in a visible location adjacent to the fuel gas inlet which reads, as applicable: