What does the abbreviation "BTU" stand for in relation to gas appliances?

The abbreviation "BTU" stands for British Thermal Unit, which is a standard unit of measurement used to quantify the amount of heat energy. In the context of gas appliances, BTUs measure the energy content of the gas being utilized or the amount of heat produced by a specific gas appliance within a given time frame. Understanding BTUs is crucial for gas fitters as it helps determine the appropriate sizing and performance capabilities of heating equipment. Properly assessing BTU requirements ensures that appliances operate efficiently and effectively in providing comfort and safety in residential and commercial spaces.