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The classification of heating appliances based on the temperature of combustion products is a crucial aspect of the International Mechanical Code. A low heat appliance is defined specifically as one that emits combustion products entering the flue at temperatures of 1,000°F or less. This temperature range is characteristic of appliances that operate at lower combustion efficiencies, typically generating less heat than medium or high heat appliances.

Understanding this classification is important for compliance with safety and efficiency standards, as it ensures proper venting and minimizes risks associated with overheating. Low heat appliances are often utilized in residential settings for heating purposes, including certain furnaces and boilers that primarily burn gas or oil. Hence, recognizing the temperature threshold that categorizes a low heat appliance is key to ensuring the correct installation, operation, and maintenance in accordance with the IMC guidelines.