Btu’s (British Thermal Units) are a standard of measurement that represents the heat value of any type of energy used to create heat. The amount of fuel that a stove will consume per hour is calculated with the Btu value of the fuel it uses to determine the output of that appliance. Btu values of any type of energy are determined by the actual amount of heat required to increase the temperature of one pound of water by one degree Fahrenheit. For rough calculations 3,400 Btu’s are equivalent to 1Kw.