Which of the following is addressed in the B149.1 installation code?

The B149.1 installation code specifically addresses the installation of gas appliances, ensuring they are set up in accordance with safety regulations and best practices. This code outlines the necessary standards and requirements for the proper installation, maintenance, and operation of gas appliances to minimize risks associated with gas use, such as leaks or improper combustion.

While the other areas, such as electrical appliances, plumbing systems, and heating systems, are indeed regulated in various codes, they are not covered by the B149.1 code. Instead, separate codes and standards govern those installations, making B149.1 unique in its focus on gas appliance installations. This specialization highlights the importance of proper gas installation to ensure safety and compliance within that field.