What does BTU stand for?

BTU stands for British Thermal Unit, which is a standard unit of measurement used to quantify the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure. This unit is particularly important in the context of heating and cooling systems as it helps gauge the energy content of fuels and the efficiency of various appliances. Understanding BTUs is essential for anyone involved in the heating and gas industry, as it directly relates to the performance and consumption of gas appliances, as well as the necessary sizing and efficiency considerations for heating systems. The other terms listed do not have recognized significance in the context of energy measurement and are not used in the industry.