Separated Combustion Gas-Fired Unit Heaters - Modine HVAC

Separated Combustion Gas-Fired Unit Heaters

Separated Combustion Gas-Fired Unit Heaters

Modine’s PTS/BTS separated combustion unit is specifically designed for environments with hostile atmospheric conditions, such as chemicals, high humidity or negative pressure. 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.

  • 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.
  • Round vent pipe and combustion air inlet pipe connection
  • Automatic reset vent pressure switch is designed to prevent operation of the main burner in the event there is restricted venting of the flue
  • Integrated direct spark control board provides digital control of the air mover, inducer, ignition, gas valve and flame sense
  • Control Step Down Transformer used to step down from 115v to 24v for the gas controls, fan delay relay, field supplied motor start and more.
  • Remote flame sensor verifies ignition of all burners, monitors the flame single and communicated with the integrated circuit board
  • High limit control switch is mounted in the air stream and will shut off the gas supply in the event of overheating
  • The PTS and the BTS are available in 7 models sizes
  • Range from 150,000 to 400,000 BTU/hr.
  • Optional finger-proof fan guard for operation at low mounting heights

Available models:

  • Standard model PTS
  • Blower model BTS


  • Single or two stage gas valve are available
  • Optional stainless steel heat exchanger
  • Centrifugal blower models with adjustable sheaves for wide airflow range (BTS line).
  • Building Management System (BMS) integration capabilities allowing them to be added to existing BMS easily.


  • Vertical Deflectors Blades
  • 30, 60 and 90 degree air deflector hoods
  • Horizontal Concentric Vent Kit
  • Pipe Hanger Adapter Kits
  • Natural Gas to Propane Gas Conversion Kits
  • Single or Two-Stage Room Thermostats
  • Room Thermostat Guard
  • Stepdown Transformers
  • Controls Relays

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