To calculate the annual gas consumption of a boiler, you'll need to know a few key parameters and use a formula. Here's the general approach:

1. Boiler Efficiency (AFUE): Determine the Annual Fuel Utilization Efficiency (AFUE) rating of your boiler. This rating is typically expressed as a percentage and represents how efficiently the boiler converts fuel (gas) into heat. For example, if your boiler has an AFUE of 90%, it is 90% efficient in converting gas into heat.

2. Heating Load: Estimate or measure your heating load in British Thermal Units (BTUs) per hour. The heating load depends on factors such as the size of your home or building, insulation, climate, and desired indoor temperature.

3. Heating Degree Days: Determine the heating degree days for your location over the course of a year. Heating degree days measure the number of degrees that the average daily outdoor temperature is below a specific base temperature (usually 65°F or 18°C). You can obtain this data from local weather records or online sources.

4. Boiler Output Capacity: Know the output capacity of your boiler in BTUs per hour. This information can typically be found in the boiler's documentation.

Now, you can use the following formula to calculate the annual gas consumption:

Annual Gas Consumption (in therms or cubic meters) = (Heating Load (BTU/hr) / Boiler Efficiency) / (Heating Degree Days / 24) / 100,000

• Divide the Heating Load by Boiler Efficiency to find the heat required in BTUs per hour.
• Divide this heat requirement by (Heating Degree Days / 24) to account for daily heating needs.
• Finally, divide by 100,000 to convert BTUs to therms (or cubic meters, depending on your region's gas unit).

Please note that this formula provides an estimate and may not account for variations in weather, boiler performance, and usage patterns throughout the year. For a more accurate assessment, you may consider installing a gas meter that tracks your actual gas consumption over time.

Also, remember to check your local gas utility bill or contact your gas supplier, as they may provide information about your actual gas consumption on a regular basis. This data can help you understand your specific usage patterns and adjust your heating system accordingly for efficiency and cost savings.

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