This website is intended to assist licensed professionals in the exercise of their professional judgement.

Features of NP Series Negative Pressure Unitary Heaters

  • Provide design flexibility with straight, U-tube or L configurations and a broad range of burner sizes and tube lengths


  • Vacuum design with uniform tube temperature provides even heat distribution


  • Minimal heat exposure to valuable electrical components provided by burner box design with protective enclosure for controls


  • Longer life provided by durable components


  • Heats effectively at high mounting heights and in high heat loss environments