Heavy duty industrial unit heaters featuring T3C ratings - the lowest ignition temperature rating in the industry! The DX-233 Series heaters are offered in a wide range of power outputs, voltage ratings and available control systems for custom tailoring to your needs. Dual (automatic and manual reset) over-temperature protection incorporated with a 70 PSIG relief value setting for additional user safety. A welded steel heat exchanger with painted steel heaters, steel tubes, and spiral wound aluminum fins for extra unit durability. Ideal for environments where there is a risk of vapour or dust combustion.