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HD/HDB Series

Hot Dawg® Power-Vented Gas-Fired Unit Heater

When cold weather hits, count on the Modine Hot Dawg® Power-Vented Gas-Fired Unit Heater (HD/HDB) to deliver powerful, consistent heat where you need it most. Designed for performance and built to last, this low-profile unit heater combines commercial-grade durability with quiet, efficient operation, making it the go-to choice for garages, workshops, warehouses, and light commercial applications.

Models

  • Model HD: Power-Vented with Propeller Fan
  • 6 Model Sizes: 30, 45, 60, 75, 100, and 125 MBH
  • Model HDB: Power-Vented with Centrifugal Blower Fan
  • 4 Model Sizes: 60, 75, 100, and 125 MBH

Highlighted Features

Modine hot dawg power-vented gas-fired unit heater, adjustable blades and heat exchanger detail view

Reliable, Efficient Heat Delivery

Built with a power-vented design and dimpled tube heat exchanger, the Hot Dawg safely removes combustion gases while maximizing fuel efficiency—delivering steady, even warmth with less energy waste. Perfect for keeping garages or workspaces comfortable all winter long.
Modine hot dawg power-vented gas-fired unit heater, model hd45, ceiling mounted in a residential garage

Space-Saving, Ceiling-Mounted Design

Designed for convenience, this compact heater mounts easily from the ceiling, freeing up valuable floor space. Its low-profile layout makes it ideal for areas where room is limited, like garages, workshops, and service bays.
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

Quiet, Durable Performance

Engineered for quiet operation and constructed with corrosion-resistant materials, the Hot Dawg ensures dependable performance year after year. Once it’s installed, you’ll barely notice it’s running—except for the consistent comfort it provides.

Product Details & Specifications

Key Features
  • Power-Vented System: Safely exhausts combustion gases outdoors, ensuring clean, efficient operation and consistent comfort.
  • 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 Heat Exchanger: Aluminized steel tubular heat exchanger resists corrosion and extends product life.
  • In-Shot Burners: In-shot burners on each heat exchanger tube for reliable performance, ease of serviceability, and low sound level on flame ignition/extinction.
  • 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.
  • Quiet Performance: Ideal for environments where comfort and low noise matter.
  • Fuel Flexibility: Operates on natural gas or propane for convenience across applications.
  • Thermal Efficiency Up to 83%: Reduces energy use while maintaining reliable output.
  • 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

Factory-Configurable Options

  • Configuration Types:
    • Propeller (HD) or Blower (HDB)
  • Input Ratings (Btu/hr):
    • Propeller (HD): 30,000; 45,000; 60,000; 75,000; 100,000; 125,000
    • Blower (HDB): 60,000; 75,000; 100,000; 125,000
  • Heat Exchanger Material:
    • Aluminized Steel
    • Stainless Steel
  • Ignition Type: Direct Spark Ignition
  • System Operating Voltage & Phase (Power Code):
    • Propeller (HD): 115V/60Hz/1-Phase
    • Blower (HDB): 115V/60Hz/1-Phase (standard or compatible with higher supply voltages via step-down transformers)
  • Gas Control Configuration (Type & Stages):
    • Natural Gas, Single Stage
    • Natural Gas, Two Stage (sizes 75 and larger only)
    • Propane Gas, Single Stage
    • Propane Gas, Two Stage (sizes 75 and larger only)
  • Fan Guard Type:
    • Standard (HD Propeller only)
    • Fingerproof (HD Propeller only)
    • None (Standard for all HDB Blower models)

Accessories
  • Venting Accessories:
    • Vent Caps (Sizes 30–75: 3″, 100–200: 4″, 250–400: 6″)
    • 3″ Vent Kit (Complete 3″ kit, Spare 1ft/2ft pipes, 45° and 90° elbows) – for HD 30–75
  • Gas Conversion Kits:
    • Natural to Propane and Propane to Natural (Single-Stage & Two-Stage)
  • Blower-Specific Accessories (HDB 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 – for blower units (HDB) only
    • Energy Saver Thermostat
  • Miscellaneous & Suspension Accessories:
    • Vibration Isolation Kit (4 Isolators) –for propeller(HD) sizes 55–260 only
    • Vibration Isolation Kit (6 Isolators) – for blower(HDB) models only
    • Ceiling Mounting Brackets – for sizes 30–75 and 100–125)
    • 2-Point Suspension Kit – for HD sizes 55, 65, 85–400
    • Quick-Sling QSWI-3000
    • On/Off Toggle Switch Kit

Warranty

Applications

The Hot Dawg® HD/HDB is designed for residential garages, workshops, and commercial environments that need powerful, quiet, and reliable heat.

Common applications include:

  • Home garages and hobby workshops
  • Small warehouses and storage buildings
  • Retail stock rooms or maintenance bays
  • Greenhouses and agricultural spaces
  • Service stations and auto repair shops
  • Specialty retail and other light commercial spaces

Tech Documents

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