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HDS45 Combustion Heater_360
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HDS/HDC Series

Hot Dawg® Separated Combustion Gas-Fired Unit Heater

When air quality matters as much as comfort, trust the Hot Dawg® Separated Combustion Gas-Fired Unit Heater. Designed for environments where dust, dirt, or fumes are present, this unit pulls in 100% outside combustion air—keeping internal components clean and ensuring safe, efficient performance. This separated combustion technology delivers clean heated air, remarkable durability, and lower maintenance in contaminated environments, making it ideal for residential garages, workshops, auto repair bays, body shops, woodworking areas, and greenhouses.

Models

  • Model HDS: Power-Vented with Propeller Fan
    • 6 Model Sizes: 30, 45, 60, 75, 100, and 125 MBH
  • Model HDC: Power-Vented with Configurable Blower
    • 4 Model Sizes: 60, 75, 100, and 125 MBH
Where To Buy

Highlighted Features

A worker in an automotive repair shop sanding a car part while wearing a protective mask, with a well-lit industrial workspace in the background.

Separated Combustion System

The HDS/HDC draws in 100% outside air for combustion—keeping interior air clean and maintaining peak efficiency even in dusty, dirty, or negative-pressure environments.
Modine how dawg gas-fired and power-vented unit heater, sleek gray powder coated finish with black and brushed stainless steel logo decal detail view

Reliable, High-Performance Heating

Built for dependable operation with natural gas or propane, the HDS/HDC delivers consistent, efficient heat —ideal for garages, workshops, auto repair bays, body shops, woodworking areas, and greenhouses.
A contractor installing a Modine Hot Dawg gas-fired power-vented unit heater, model HD45, in a residential garage

Durable & Easy to Maintain

A corrosion-resistant aluminized steel heat exchanger and easy-access panels make installation and maintenance simple—reducing downtime and extending the life of the unit.

Product Details & Specifications

Key Features
  • Separated Combustion System: Factory-assembled and certified for separated combustion. No additional parts are needed, allowing for easier, quicker installation that provides greater durability and reduced maintenance.
  • High Thermal Efficiency (up to 82%): Maximizes heat output while minimizing fuel costs.
  • Quiet Performance: Engineered for low noise—ideal for residential and professional settings.
  • Venting Versatility: an integral power exhauster allows vertical or horizontal venting with the smallest-diameter vent pipe possible.
  • Compact, Low-Profile Design: Installs effortlessly in confined areas or overhead, requiring only 1 inch of clearance from the ceiling to optimize available floor space.
  • Baked Polyester Paint: Features a neutral-colored, baked-on polyester paint that provides excellent corrosion resistance and durability while blending into a wide variety of environments.
  • Durable Construction: Aluminized steel tubular heat exchanger resists corrosion and extends product life.
  • Electric Knockouts: Electric wiring knockouts and field wiring connections keep installation costs low and save time on installation and maintenance
  • Flexible Mounting Options: Choose from ceiling or wall configurations for a custom installation.
  • Fuel Flexibility: Operates on natural gas or propane for convenience across applications.
  • ETL Certification: ETL certified for residential, commercial, and industrial use in the US 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 (HDS)
  • Centrifugal Blower Fan (HDC)

Model Sizes:

  • HDS – 30, 45, 60, 75, 100, and 125 MBH
  • HDC – 60, 75, 100, and 125 MBH

Heat Exchanger:

  • Tubular, Aluminized Steel (Standard)
  • Tubular, 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, Direct Spark Ignition, 100% Shut-Off with Continuous Retry
  • Two Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry
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

The HDS/HDC is built for spaces where airborne contaminants, moisture, or chemicals can shorten the lifespan of standard heaters. By isolating the combustion chamber and drawing in clean outdoor air, it ensures efficient heating in:

  • Residential workshops and garages with chemical storage
  • Auto service and paint shops
  • Greenhouses and nurseries
  • Agricultural barns and storage facilities
  • Manufacturing spaces with airborne dust or fumes

Tech Documents

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