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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
  • Room thermostats
  • Vent caps
  • Vibration isolation
  • Unit transformers
  • Vertical deflector blades
  • Vent Cap
  • Two-point suspension kit
  • Conversion kits for natural gas and propane, including high-altitude kits
  • 30, 60, and 90-degree air deflector hoods
  • Summer-Winter Toggle Switch
  • Discharge air transitions (Blower models only)
  • Blower enclosure (Blower models only)
  • Filter racks (Blower models only)
  • Blower belt guard (Blower models only)

For a complete list of accessories, please contact your local Modine representative.

Warranty
Applications

Specification

Models PTX/BTX

Details & Notes

BTU Range

150,000 – 400,000 BTU/hr

Multiple capacities for residential, commercial, or industrial use

Thermal Efficiency

Up to 83%

Energy-efficient heat exchanger minimizes fuel consumption

Fuel Type

Natural Gas or Propane

Factory-configured, convertible for installation flexibility

Ignition Type

Direct Spark Ignition

Dependable starts in all operating conditions

Venting

Separated Combustion or Power-Vented

Horizontal or vertical venting options for safe combustion exhaust

Heat Exchanger

Aluminized Steel Tubular Heat Exchanger

Aluminized steel heat exchanger (409 stainless steel optional)

Burner

In-shot burner on each heat exchanger tube

Designed for reliable performance, ease of serviceability, and low sound level on flame ignition/extinction

Airflow

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

Propeller for open spaces; blower for ducted applications

Mounting Options

Ceiling or Wall

Multi-position mounting brackets maximize space efficiency

Cabinet Material

Heavy-Gauge Steel

Designed for strength and corrosion resistance

Finish

Baked-on polyester powder paint

Durable and corrosion-resistant coating protects against moisture and wear

Electrical

115V, 60Hz, 1Ph (Standard)

Alternate power configurations: (208V/1Ph/60Hz, 230V/1Ph/60Hz, 208V/3Ph/60Hz, 230V/3Ph/60Hz, 460V/3Ph/60Hz, 575V/3Ph/60Hz)

Certifications

ETL certification for commercial and industrial use in the US and Canada

Meets North American safety and performance standards

Warranty

10-Year Heat Exchanger / 2-Year Parts

Supported by Modine’s long-standing warranty program

Tech Documents

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