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Commercial 20 Ton Oil Condensing Boiler Cheap

Combustion Evaluation: Sources and Control Devices

The available heat for the boiler at 500°F and theoretical combustion equals 9, 150,000 BTU per hour. If 20 percent excess combustion air was used, the available heat at 500°F would be decreased to about 79 percent of the gross heating value for natural gas (calculated from Figure 4).

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