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Modine Garage Heater
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Modine Hot Dawg HD Heater Information
(for HD propane and natural gas heaters)
Back to Modine HD Heaters Pricing Page or HD Parts Page

Modine HD gas heater in a garage
Hanging the HD75 heater in a garage
Modine HD Garage Heaters
Modine Garage Recommendations
Square Feet
1 to 1-1/2 Car Garage
200 - 380
2 to 2-1/2 Car Garage
400 - 600
3 to 3-1/2 Car Garage
600 - 780
4+ Car Garage
800 - 1000

Modine Tubular Heat Exchanger
Other unit heaters available today are designed with the old clamshell style heat exchanger, positioned above ribbon-style burners. These are the most common points of failure, especially in the greenhouse environment. Heat exchangers invariably fail at the points where manufacturing processes have weakened the metal by stamping, crimping and welding. Modine HD gas heaters are equipped with a tubular heat exchanger which consists of smooth, continuous tubes are formed in a serpentine shape and then placed in parallel rows. This type of heat exchanger has no stress points, no points where the metal has been compromised making it more durable than a similar clamshell heat exchanger and allowing the unit to be equipped with in-shot burners.

Modine Advanced Burner Design
Modine HD's burner design is more akin to that of a fire-tube boiler than a unit heater. With these in-shot burners, the flame is retained inside the heat exchanger and fires down the inside of the heat exchanger tube. This design accomplishes three things: First, it eliminates the need for separate conventional ribbon-style burners; Second, it enhances flame quality and heat transfer; and Third, it eliminates most burner corrosion problems. Conventional burners fail when moisture from condensation drips on them. This problem is eliminated with the Modine in-shot burner system.

Modine Control System
Single Stage, Electronic Pilotless Ignition, 100% Shutoff with Continuous Retry - Utilizes a single stage combination gas control with built-in ignition control.  Gas is lit with an electronic igniter on call for heat. Some gas heaters have pilot flames which must stay lit for the heater to perform.  With an electronic igniter, you don't have to worry about drafts putting out the flame.  It comes on only when heat is needed every time heat is needed!  Another advantage of this type of igniter is that there are no fumes released from it like with pilot flames. 115 volt power supply and 25 volt controls.

Modine Power Vent System
Every HD natural gas or propane heater features a fan powered vent exhaust. Power vents force heater exhaust fumes outside of the heated structure, and allow the heater to be vented vertically or horizontally. Horizontal venting keeps heat from escaping out of the vent pipe when the heater is not running. This is especially important when using gas powered heaters in greenhouses.  Conventional vents use natural air drafts (chimney effect) to expel exhaust fumes.  Unvented gas heaters leave these fumes in the greenhouse which can be harmful to plants.
Modine Diagnostic System
Every HD heater has advanced diagnostic controls that monitor all primary heater functions for dependable, worry-free operation. If the HD heater doesn't start, a LED diagnostic light on the heater will flash indicating where the problem occurred and makes fixing the problem quick and easy.

Modine Safety Devices
Limit Control (Overheat Switch) - will shut off the gas to the heater should excessive discharge temperatures occur.
Flame Rollout Switch - will shut off the gas supply to the heater in the event of flame rollout.
Pressure Switch - will shut off the gas supply to the heater in the event of a problem with the venting system.

Modine HD gas heater Modine HD heater

Dimensions (in.)
Models HD30 HD45 HD60 HD75 Models HD30 HD45 HD60 HD75
A 26.8 26.8 26.8 26.8 BTU input 30,000 45,000 60,000 75,000
B 12.2 12.2 18 18
80% 80% 80% 80%
C 16.5 16.5 16.5 16.5 BTU output 24,000 36,000 48,000 60,000
D 14.9 14.9 14.9 14.9 Outlet Velocity (CFM) 523 749 653 769
E 10.1 10.1 15.9 15.9 Air Temp. Rise (°F) 44 46 45 48
F 7.5 7.5 10.7 10.7 Heat Throw (ft.) 25 27 36 38
G 18.5 18.5 18.5 18.5 Motor
Horsepower 1/15 1/15 1/12 1/12
H 7.6 7.6 7.8 7.8 RPM 1,550 1,550 1,625 1,625
I 34.5 34.5 34.5 34.5 Amps 2.4 2.4 1.2 1.2
J 22 22 25 25 Unit Total Amps
3.7 3.7 2.5 2.5
Gas Connection 1/2 1/2 1/2 1/2 Vent Pipe
Connector (in.)
3 3 3 3
Weight (lbs) 55 60 80 85 Fan Diameter 10 10 14 14

Clearances to Combustibles
Top and Bottom
Access Side
Non Access Side

*It is recommended that all gas heaters be installed by a qualified installation and service contractor.
*Heat Throws are calculated at 65 degrees F ambient and unit fired at full rated input.
*Ratings shown are for elevations up to 2,000 feet above sea level. For elevations above 2,000 ft., ratings should be reduced by approximately 4% for each 1,000 ft. above sea level.

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 ACF Greenhouses
380 Greenhouse Drive
Buffalo Junction, VA 24529
434-374-2706 Phone, 434-374-2055 Fax
888-888-9050 Toll Free

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