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Commercial Gas Fired Unit Heaters

Separated Combustion (PTS/BTS)

Modine's PTS/BTS separated combustion unit is specifically designed for environments with hostile atmospheric conditions, such as chemicals, high humidity or negative pressure. This tubular heat exchanger is available in units rated from 150,000 to 400,000 BTU/hr. On these units, combustion air is brought in from outside the heated area, either from outdoor air or from an adjacent room, eliminating the need to use contaminated indoor air for combustion.


  • Swept wing fan on sizes from 100,000 to 200,000 BTU's/hr for superior airflow and noise reduction where it's needed most.
  • In-shot burners fire each heat exchanger tube for reliable performance, ease of service and decreased noise on ignition.
  • Same-size vent and combustion air inlets throughout product line makes installation easier.
  • Longer allowable vent lengths (up to 50' vs 30') versus previous line, providing greater installation options.


  • Optional stainless steel heat exchanger

  • Centrifugal blower models with adjustable sheaves for wide airflow range (BTS line).

  • Optional finger-proof fan guard for operation at low mounting height.