Watlow WATROD duct heaters provide the optimal solution for non-pressurized air heating applications across a wide range of temperature and air flow combinations. Constructed with sturdy 11mm diameter WATROD heating elements mounted to 6mm thick steel housing, these units deliver tough, adaptable, and dependable heating for drying ovens, autoclaves, furnaces, load banks, heat treating, HVAC systems, and paint drying operations.

Advantages Over Alternative Heating Methods

WATROD duct heaters offer significant advantages over gas, oil fired, or open coil electric units. There is no need for flues or fuel lines, eliminating combustion-related safety concerns and installation complexity. These units are 100 percent energy efficient—all energy consumed is converted to heat with no flue losses, providing cost savings compared to combustion-based systems. Extensive configuration options for wattages, voltages, materials, dimensions, terminals, and mounting accommodate diverse application requirements.

Construction Features

Long-life Incoloy sheaths protect resistance coils from contamination while resisting corrosion and oxidation. The 3.5 inches of insulation between elements and the housing keeps wiring cooler while reducing heat loss. A vented general purpose (NEMA 1) terminal enclosure ensures cooler terminations for extended component life. Field replaceable heating elements permit easy service and reduce downtime. Rigid stainless steel supports prevent element sagging or deformation in various mounting positions.

Temperature Sensing Integration

A 0.25-inch inside diameter thermowell accepts optional Type J or K thermocouples for accurate sheath temperature sensing. This integration enables precise temperature control and monitoring. All WATROD hairpins are recompacted to ensure MgO density that eliminates hot spots. UL and CSA component recognition provides assurance of safety compliance for industrial installations.