The minimum size of the supply piping outlet for any gas appliance shall not be less than what diameter?

The minimum size of the supply piping outlet for any gas appliance is typically determined by the appliance's BTU input, specifically to ensure adequate gas flow for safe and efficient operation. A diameter of 1/2 inch is widely accepted and is mentioned in various plumbing and gas codes as the minimum required for residential gas appliances.

This size is sufficient for small to medium appliances like ovens and water heaters, assuming proper installation and that the total BTU capacity does not exceed the limitations of this pipe size. Using a larger diameter may be necessary for high-demand appliances; however, a 1/2 inch outlet remains the standard minimum to accommodate a variety of typical residential applications safely.

Larger diameters, such as 3/4 inch or 1 inch, would be more appropriate in scenarios with multiple appliances or those that require higher gas volumes, but they exceed the minimum requirement, which is why 1/2 inch is considered the correct answer in this context.