What factor should always be checked during the installation of gas appliances?

The factor that should always be checked during the installation of gas appliances is compliance with local codes and regulations. This is essential because local codes are designed to ensure safety, efficiency, and proper functioning of gas appliances within a specific area. They address various considerations such as installation practices, materials used, and the safe operation of the gas appliances. Adhering to these regulations helps prevent accidents such as gas leaks, fires, or carbon monoxide poisoning.

Local codes may vary significantly from one region to another, as they can be influenced by environmental considerations, building practices, and the local infrastructure. Thus, ensuring compliance means that the installation is not only legal but also safe for the users. It often involves inspections and permits, which further guarantee that the installation meets safety standards.

Other factors like proximity to electrical outlets, access to plumbing, and the type of fuel used are important but secondary to the overarching need for code compliance. While these factors can affect the efficiency and functionality of the appliance, they do not supersede the necessity of following local regulations that are ultimately designed to protect users and promote safe practices.