Gas-fired toilets installed on combustible floors must be what?

Gas-fired toilets installed on combustible floors must be listed for installation. This requirement ensures that the toilet has been tested and approved by an appropriate standards organization, confirming it meets safety and operational codes for gas appliances. Being "listed" indicates that the product has undergone rigorous evaluations for factors such as safe operation, risk of fire, and compliance with local and national regulations.

The focus on having a listed appliance is crucial on combustible floors to prevent any potential ignition of materials. It establishes a baseline of safety that helps protect users and property. Proper listing reflects that the appliance can safely handle the combustion process without presenting hazards associated with gas leaks, flame contact, or heat accumulation.

Other considerations, such as insulation or shielding, do play a role in appliance safety but do not carry the same level of regulatory assurance as being listed. Securely bolting the appliance could also be necessary for stability, especially in certain environments, but it does not address the core safety requirements of appliance approval for use on combustible surfaces.