• Modine Hot Dawg HD45 Gas Heaters - 4010130
  • Modine Hot Dawg HD45 Gas Heaters - 4010130
  • Modine Hot Dawg HD45 Gas Heaters - 4010130
  • Modine Hot Dawg HD45 Gas Heaters - 4010130
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Retail: $829.00
Price: $769.00
Availability: In Stock - Usually ships in 1 to 2 days.

Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition, low profile design, and quiet operation. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments. Some wiring required. Requires 110/120v electricity. Modine Hot Dawg units come setup for propane or natural gas. Call for elevations over 5500' above sea level.

  • 80% efficient
  • Made in the USA
  • Certified for residential, commercial, and industrial use
  • Direct spark ignition
  • Power vented exhaust
  • Convenient diagnostic system for troubleshooting
  • Mounting brackets included
  • 10 year warranty on the heat exchanger

Performance Specifications

For Greenhouse Sizing, use our Greenhouse Heater Size Calculator
Model Application BTU Input BTU Output W x D x H Weight (lbs)
HD30 1 to 1-1/2 Car Garage
200 to 400 Sq. Ft.
30,000 24,000 26.8" x 22" x 12.2" 68
HD45 2 to 2-1/2 Car Garage
400 to 600 Sq. Ft.
45,000 36,000 26.8" x 22" x 12.2 78
HD60 3 to 3-1/2 Car Garage
600 to 800 Sq. Ft.
60,000 48,000 26.8" x 25" x 18"
HD75 4+ Car Garage
800 to 1000 Sq. Ft.
75,000 60,000 26.8" x 25" x 18" 85
HD100 Large Garage or Shop
1000 to 1200 Sq. Ft.
100,000 80,000 35.5" x 31" x 20.5" 125
HD125 Large Garage or Shop
1200 to 1400 Sq. Ft.
125,000 100,000 35.5" x 31" x 20.5"

Product Manuals, Tips, Specs, & Guides

Modine HD Heater Specs and Dimensions
Modine HD Heater Installation Manual

Overall Customer Rating of 3 Reviews:

HD 45 heater

Set up was easy got it dialed in no problem. Then it stopped working a few days later after testing it out for its short cycle condition. Electrically it was fine. Looking around in the cabinet I found the hose that connects the exhaust blower cowling to the exhaust sensor had fallen off and was laying up there on top of the blower. Hooked it back up and it’s back to running again.


Would buy again

High quality and fit was also good. I installed and hooked it up, and it worked well the first try. It is heating my one car garage well. The one small drawback is that it is kind of noisy. The fan for the exhaust is loud.

Moorhead, MN

Good heater for the garage

Works well. Fan turns on before the burner is even running for some reason but works fine. Keeps my garage warm and dry. Found all of the venting items I needed on this website as well. Definitely not for the inexperienced installer.