Electric Heater Duty Calculator Quickly calculate the correct duty required for your heater. Heated Medium Heated Medium: Select Medium Others Air Ammonia Argon Benzene Butane Iso Butane N Carbon Dioxide Carbon Monoxide Chlorine Crude Oil Ethane Ethene Fuel Gas Helium Hydrogen Hydrogen Chloride Methane Natural Gas Nitrogen Oxygen Propane Sulphur Dioxide Water Water Vapour Specific Heat: KJ/kg.K Specific Heat: BTU/lb°F Inlet Temperature Fahrenheit: Celsius: Outlet Temperature Fahrenheit: Celsius: Result Temperature Change: Celsius: Heated Medium Select Medium Others Air Ammonia Argon Benzene Butane Iso Butane N Carbon Dioxide Carbon Monoxide Chlorine Crude Oil Ethane Ethene Fuel Gas Helium Hydrogen Hydrogen Chloride Methane Natural Gas Nitrogen Oxygen Propane Sulphur Dioxide Water Water Vapour Specific Heat (KJ/kg.K): Specific Heat (BTU/lb°F): Inlet Temperature Fahrenheit: Celsius: Outlet Temperature Fahrenheit: Celsius: Result Temperature Change (°C): Mass Flow Rate (kg/h): kW: BTU/h: