Which measurement indicates pressure when dealing with gas appliances?

The measurement that indicates pressure when dealing with gas appliances is expressed in inches of water column (In W.C.). This unit is particularly relevant in the context of gas appliances because it reflects the low pressure conditions typically involved in residential and commercial gas systems. In W.C. is commonly used to measure the pressure of gas entering appliances, ensuring they operate efficiently and safely.

This measurement is crucial for calibrating appliances and verifying that the correct gas pressure is being supplied for combustion processes. It allows technicians to diagnose performance issues and ensure compliance with safety regulations.

Other pressure measurements, such as Psig (pounds per square inch gauge) and Psia (pounds per square inch absolute), are used in different contexts and applications but are not standard for gas appliance pressure measurements. Bar is another unit of pressure, but it is generally used in industrial applications or in contexts where higher pressure ranges are involved, making it less relevant for the specific requirements of gas appliances.