How to Calculate Gas Boiler Burners Fuel Consumption?

If you use gas boiler for heating, choosing good quality burner is very very very important. XHJ boiler always focus on high efficiency burner, help user save more gas cost in daily. Gas boiler burners consume fuel based on their BTU output. Natural and gas have specific levels of energy contained them. One cubic-foot of natural gas contains 1075 BTUs. However, Gas boiler burners are not 100-percent efficient. If you know the burner efficiency, you can calculate the exact fuel consumption. If you do not, you will have to use an approximation. LP gas and natural gas contain different amounts of energy, so the conversion factor is different.



Approximate Gas Consumption

Step 1: Find the burner output rating from the user documentation or the appliance sticker such as that found on a water heater, like this biomass fired steam boiler. The output rating will be listed in BTU (such as 40,000 BTU). BTU stands for British Thermal Units.
Step 2: Divide the BTU output by the approximate conversion factor. A natural gas burner rated at 40,000 BTUs per hour divided by 1,000 BTUs per cubic foot uses approximately 40 cubic feet of natural gas in one hour.



Exact Gas Consumption

Step 1: Multiply the burner efficiency by the energy content of the gas steam boiler being used. Natural gas contains 1,075 BTUs per cubic foot; propane contains 2570 BTUs per cubic foot.
Step 2: Determine the burner output in BTUs per hour from the appliance sticker or user documentation. The output will be in BTU (for example, 40,000 BTU).
Step 3: Divide the BTUs per hour by the fuel energy content. Our burner with the 40,000 BTU per hour output divided by 1,075 equals 37.21 cubic feet of gas per hour. This is consumption at 100-percent efficiency
Step 4: Adjust for the burner efficiency by dividing consumption at 100 percent efficiency by the burner efficiency rating. For a burner that is 95-percent efficient, divide by 0.95. In the example: 40,000 BTU divided by 1,075 = 37.21. Adjusting for burner efficiency: 37.21 divided by 0.95 = 39.17 cubic feet of natural gas consumed in one hour.

These calculation methods can help you know boiler gas consumption. XHJ boiler insists on high-efficiency gas burners, let boiler user get lower gas consumption and better heating effect in long-term running.