Electric Heaters

Electric heaters generate heat by passing an electric current through a high-resistance material. They use a radiant flat panel emitter, a radiant reflective element, a flexible heater element, or a tubular element. Radiant flat panel emitters may be surfaced with quartz cloth, glass, stainless steel, or ceramic material. Radiant reflective elements may use quartz or sheathed tubular elements, a straight or hairpin design, or a custom shape or bend. There are two types of flexible heater elements: etched foil and wire wound. The former is etched into the heater’s surface. Tubular elements for electric heaters may be single-ended, double-ended, round, flat, or triangulated. The number of elements is also an important consideration. 

Electric heaters differ in terms of insulation and applications. Choices for insulation include ceramic, magnesium oxide, mica, mineral, fluoropolymer, and fiberglass. Applications for electric heaters include annealing and heat treating, curing and tempering, drying, melting, and the heating of gases and vapors. Electric heaters are also used to heat clean water, process waters, and high purity waters; lightweight oils and degreasing solutions; heavy weight and medium weight oils; and mild corrosive solutions, severe corrosive solutions, and caustic solutions. 

Specifications for electric heaters include maximum temperature, maximum air flow, and heating capacity. There are two parameters for maximum temperature: maximum operating temperature and maximum air temperature. The maximum operating temperature for electric heaters is the highest temperature that the heater’s sheath or protective cover may reach. The maximum air temperature, as its name suggests, is the maximum temperature of the air exiting from the heater. Heating capacity is the wattage that electric heaters can deliver.

There are many optional features for electric heaters. Some products are corrosion resistant, explosion-proof, finned, indirect-fired, or microprocessor controlled. Others are designed for cryogenic applications, feature custom designs, provide dynamic power regulation, or have an encased coil to maximum heat transfer. Electric hearers may also be equipped with a grounding wire, internal temperature detector, and multiple / independent timing controls. Additional features for electric heaters may include overheat protection, portability, thermostat control, and approval by Underwriters Laboratories (UL). Typically, documentation of UL certification is available from the manufacturer.

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Part Numbers for Electric Heaters