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The sheath material of a finned tubular heater and its watt density are two critical factors that affect its durability. The standard finned tubular heaters are made of steel sheath and steel fins (750°F max. surface temperature) since steel is very efficient in heat transfer. These heaters have a plain-surface finish. For corrosive environments or high temperature applications (above 750°F), finned tubular heaters could be made with stainless steel sheath and stainless steel fins.

Safe watt densities that keep surface temperatures below allowable limits depend on the speed of the incoming air and its outlet temperature. Graph 2 shows maximum watt densities recommended for a specific sheath temperature and air velocity.

Kilowatts to Heat Air