The entire heater assembly is encased in a stainless steel sheath and is compressed under high pressure. The sheath combines additional corrosion protection and excellent appearance. Stainless steel strip heaters are suitable for applications where the maximum sheath temperature does not exceed 649° C (1200° F). Constructed of specially selected, high grade materials, including high temperature alloy resistance wire and corrosion-resistant aluminized steel sheath (suitable for maximum sheath temperature up to 538°C (1000°F) or corrosion-resistant stainless steel sheath. Controlled coil process and placement assures uniform heat distribution over the entire active surface of the heater. Special refractory material possesses excellent heat transfer characteristics, superior insulation properties and rigid vibration resistance to provide a heavy-duty heating unit. Slotted mounting tabs allow lineal expansion during initial heat-up period.