Finned Tubular Duct Heater Finned tube heat exchanger for heat transfer between air, gas, and liquids or steam. Heat exchangers with finned heating surfaces, so-called finned tube heat exchangers, offer the possibility of heat transfer between gases and liquids significantly space-saving and are more efficient to implement than it is possible with straight tubes. Our finned tubular […]
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Straight And Formed Tubular Heaters Industrial tubular heaters are highly adaptable to most applications where electrical heating is required. They can be used in their straight form or bent into various shapes. Tubular heaters can be used in free air, clamped to a surface, placed inside a groove or cast into metal. These versatile heating
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Flange Tubular Heaters Flanged immersion heaters are high-capacity electrical heating units made for tanks or pressurized vessels. They consist of multiple tubular heaters formed into hairpins and welded or brazed to flanges. The heating elements could be made of copper, steel, stainless steel, or Incoloy sheath. Standard flanges are carbon steel rated for 150 or
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Low / Medium Watt Density Our Standard Cartridge heaters are designed as an economical, quality heater for lower temperature use. The Standard Cartridge Heater is made to withstand a sheath temperature of up to 1000 °F (538 °C), internally up to 1200 °F (649 °C), and features a stainless steel sheath for resistance to oxidation.
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High-Density Cartridge Heater The ruggedly constructed, high watt density Hi-Temp Cartridge heaters provide excellent heat transfer efficiency, high operating temperature, and long life. The Hi-Temp Cartridge is made to withstand a sheath temperature of up to 1400 °F (760 °C), internally up to 1600 °F (871 °C). Its construction allows for minimal air gaps, providing
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Ceramic Strip Heaters NH ceramic heaters can be used as a flat plate heater. The use of heavy gauge metal in the shroud and lip sides causes the heater to be more rigid. Mounting holes can be placed in the perimeter of the shroud. The use of ceramic inserts to support high-temperature resistance wire allows
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Mica Band Heaters A mica band heater is made of an electrical resistance ribbon or wire, which is wound around a mica winding card and sandwiched between two sheets of mica, then wrapped in sheet metal. The resistance wire or ribbon that converts electrical energy to thermal energy is normally a nickel-chromium alloy of either
Open Coil Heaters Open coil elements are the most efficient type of electric heating element while also the most economically feasible for most heating applications. Used predominantly in the duct heating industry, open coil heater elements have open circuits that heat air directly from the suspended resistive coils. These industrial heating elements have fast heat-up
Duct Heaters Air duct heaters are ideal solutions for a variety of applications, including space heating, primary heating, secondary heating auxiliary heating, reheating, or multizone and variable air volume heating. National heaters use proprietary software packages to specify coils and wiring configurations, sheet metal, element support racks, controls, options, and accessories. Our software allows immediate
Refrigeration Defrost Heaters Refrigeration Defrost Heaters The design and manufacture of electric defrosting heaters is a need for which HMI has been an industry leader since 1929. We are ready to meet your defrosting requirements for commercial refrigeration equipment, to promote drainage and prevent freezing. Straight Length Defrost Heaters Uses: Electric defrosting of coils and evaporator pans
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