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PTX/BTX Series

Separated Combustion & Power-Vented Gas-Fired Unit Heater

When airborne contaminants or high humidity challenge standard heaters, the Modine PTX/BTX series rises to the task. This commercial-grade solution draws in fresh outdoor air for combustion while safely venting exhaust gases, keeping the heater clean, efficient, and dependable even in the harshest conditions. Ideal for warehouses, greenhouses, manufacturing plants, and agricultural buildings, the PTX/BTX combines durable construction with long-lasting performance to deliver reliable heat where it’s needed most.

Models

  • Model PTX: Separated Combustion/Power-Vented with Propeller Fan
    • 7 Model Sizes: 150, 175, 200, 250, 300, 350, and 400 MBH
  • Model BTX: Separated Combustion/Power-Vented with Centrifugal Blower Fan
    • 7 Model Sizes: 150, 175, 200, 250, 300, 350, and 400 MBH
Where To Buy

Highlighted Features

Engineered for Easy Installation & Service

With multiple venting configurations, simplified wiring connections, and service-friendly access panels, the PTX is designed to make installation and maintenance faster and more efficient for professional contractors.

Protects Air Quality. Maximizes Efficiency.

The PTX/BTX draws in 100% outside air for combustion, keeping contaminants, moisture, and corrosive fumes out of the workspace—delivering cleaner, more efficient heating in tough industrial or commercial environments.

Dual-Rated Configuration

The PTX/BTX heaters enhance efficiency and safety by sourcing combustion air from outside the heated area, ensuring cleaner combustion and improved air quality. Additionally, the dual-rated design allows for installation in a power-vented configuration, making it versatile for various settings.

Product Details & Specifications

Key Features
  • Dual-Rated: Provides the option to be installed as either a power-vented or a separate combustion unit.
  • Durable Fan/Blower Motors: Enclosed design for maximum longevity (available in model sizes 100 and above).
  • Contractor Convenience Box: Includes a terminal board, unit On/Off switch, and indicator light for easy access.
  • In-shot Burners: Each heat exchanger tube is fired for dependable performance, simplified servicing, and reduced noise during ignition.
  • Streamlined Installation: Same-size vent and combustion air inlets facilitate easier setup.
  • Extended Vent Lengths: Allows for longer vent lengths (up to 50′ compared to 30′), providing more installation flexibility.
  • Connection Type: Features a round vent pipe and combustion air inlet pipe connection.
  • Automatic Reset Vent Pressure Switch: This feature prevents the main burner from operating if there is restricted venting of the flue.
  • Integrated Direct Spark Control Board: Offers digital control for the air mover, inducer, ignition, gas valve, and flame sensing.
  • Control Step Down Transformer: Steps down from 115V to 24V for gas controls, fan delay relay, field-supplied motor start, and more.
  • Remote Flame Sensor: Confirms ignition of all burners, monitors the flame signal, and communicates with the integrated circuit board.
  • High-limit Control Switch: Mounted in the air stream, this switch shuts off the gas supply in case of overheating.
  • Baked Polyester Paint: Features a neutral-colored, baked-on polyester finish that provides excellent corrosion resistance and durability while blending seamlessly into different environments.
  • Durable Construction: The aluminized steel tubular heat exchanger is designed to resist corrosion, extending the product’s lifespan.
  • Sealed Compartment: Protects the combination gas valve, ignition control, manifold, and burner from environmental factors.
  • Venting Options: Supports both horizontal and vertical two-pipe or concentric venting configurations.
  • Flexible Mounting Options: Choose between ceiling or wall configurations for a customized installation.
  • Quiet Operation: Ideal for environments where comfort and low noise levels are crucial.
  • Fuel Versatility: Capable of running on either natural gas or propane, providing convenience for various applications.
  • BMS integration: Optional factory-installed Modine Building Management System.
  • Thermal Efficiency Up to 83%: Helps lower energy consumption while ensuring consistent output.
  • Certification: ETL certified for commercial and industrial use in the U.S. and Canada.
  • Proudly Designed, Engineered, and Assembled in the USA: Commitment to quality and craftsmanship in every unit.
Options

Fuel Type:

  • Natural Gas
  • Propane

Available Models:

  • Propeller Fan (PTX)
  • Centrifugal Blower Fan (BTX)

Model Sizes:

  • 7 Model Sizes: 150, 175, 200, 250, 300, 350, and 400 MBH

Heat Exchanger Material:

  • Aluminized Steel (Standard)
  • 409 Stainless Steel (Optional)
Supply Voltage:
  • 115V/1PH/60Hz
  • 208V/1Ph/60Hz
  • 230V/1Ph/60Hz
  • 208V/3Ph/60Hz
  • 230V/3Ph/60Hz
  • 460V/3Ph/60Hz
  • 575V/3Ph/60Hz

Iginiton Type:

  • Single-Stage, Intermittent Pilot Ignition
  • Two-Stage, Intermittent Pilot Ignition
Accessories

PTX = Propeller, BTX = Blower

Venting Accessories:

  • Concentric & Two-Pipe Vent Kits (Horizontal Concentric, Vertical Concentric, and Two-Pipe Venting) – Offered for PTX/BTX

Gas Conversion Kits:

  • Natural to Propane and Propane to Natural (Single-Stage & Two-Stage) – Offered for PTX/BTX

Blower-Specific Accessories (BTX Only):

  • Belt Guard
  • Blower Enclosure
  • Filter Rack & Filter (requires Blower Enclosure)
  • Discharge Transition for Polytube

Air Discharge Accessories:

  • Downward Air Deflector Hoods (30°, 60°, and 90°)
  • Vertical Air Deflector Blades

Thermostats & Controllers:

  • Thermostat Guard (Modine Pro1 T-150)
  • Room Thermostat (Modine Pro1 T-501M)
  • Two-Stage Thermostat (Modine Pro1 T-715M)
  • WiFi Thermostat (Modine Pro1 T855iSH)
  • Johnson Controls A350 Electronic Temp Control with S350 Stage Adder – Offered for blower units (BTX) only
  • Energy Saver Thermostat

BMS (Building Management System):

  • Factory Installed BMS

Miscellaneous & Suspension Accessories:

  • 2-Point Suspension Kit – Offered for propeller units (PTX) sizes 55, 65, 85–400
  • Quick-Sling QSWI-3000
Warranty
Applications

The PTX/BTX series is built for environments where dust, dirt, or humidity can shorten the life of standard heaters. By isolating the combustion process, it ensures cleaner performance and greater longevity in:

  • Manufacturing and processing plants
  • Agricultural barns, storage buildings, and greenhouses
  • Warehouses and loading docks
  • Vehicle service bays and maintenance facilities
  • Light industrial shops with chemical fumes or airborne particulates

Tech Documents

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