The fuel consumption of a boiler depends on its thermal power, efficiency, and the lower heating value of the fuel. This tool calculates the hourly, daily, and annual fuel consumption, and the fuel cost if you enter the price. When you select the fuel, the typical lower heating value and efficiency are automatically populated; you can change them with your own values.
Formula
Q: boiler load, η: boiler efficiency, Hu: lower heating value of the fuel (kJ/unit). Typical values used: natural gas 8,250 kcal/Sm³, imported coal 6,000 kcal/kg, lignite 4,000 kcal/kg, fuel oil 9,600 kcal/kg, diesel 8,570 kcal/L, LPG 11,000 kcal/kg, pellet 4,200 kcal/kg.
Example
A natural gas boiler operating at a load of 3,000 kW with 92% efficiency consumes approximately 339.9 Sm³/h of natural gas, and approximately 8,157 Sm³/day in 24 hours of operation.
For reducing fuel costs with solid fuels, you can refer to our coal-fired boiler guide.