Measure the temperature of the feed water with a thermometer. Write down the temperature in degrees Celsius, the Standard International (SI) unit for temperature measurements.
Measure the pressure of the steam using the pressure gauge. Record in bar gram units. To convert from your gauge's reading to bar grams, use a ratio of 1 bar gram to 10 kilopascals or 1 bar gram equals 1.01325 atms. The common abbreviation for bar grams is the letter "h" with a subscript "g".
Consult the boiler package or owner's manual to determine the boiler's rating in kilowatts, or kW.
Write out the formula for calculating steam output. It is the number of seconds in an hour, or 3600, divided by the amount of energy to be added and finally multiplied by the number of kilowatts according to the boiler rating.
Replace the variables in the equation with the numbers you recorded during your research. The amount of energy to be added is determined by subtracting temperature of the feed water from the pressure of the steam produced.
Complete the calculation to determine the maximum steam output. Your final answer will be in units of kilograms per hour.