What is a defining feature of low-heat appliances?

A defining feature of low-heat appliances is that they operate at temperatures below 538ºF. Appliances categorized as low-heat typically include those that generate relatively lower temperatures and are designed for specific applications, such as cooking or heating, where lower temperatures suffice for effective operation.

This characteristic distinguishes them from high-heat appliances, which can reach significantly higher temperatures and require different considerations regarding safety, materials, and installation. Knowing the operational temperature range is important for appropriate application and compliance with safety and building codes related to mechanical systems.

The other options either describe features of high-heat appliances or refer to operational circumstances that are not associated with low-heat appliances. For instance, the statement that they can reach up to 2,000ºF pertains to very high-temperature appliances, while the requirement for venting or the absence of combustion products characterize different types of appliance classifications.