Hot Dawg Heater Package

Hot Dawg Heater Package


$1,466.00 Regular price

  • In stock - departs in 1-2 business days
  • Inventory on the way

Our Hot Dawg Heater Package includes everything needed to heat your garage, workshop or small warehouse: High efficiency Modine Hot Dawg gas fired unit heater, 24v thermostat and both a gas connector and horizontal venting kit. Just provide gas piping and electrical wiring to the heater and you are ready to heat!

Package Includes

  • LP or Natural Gas Hot Dawg Heater (24-100,000 BTUH).
  • 24V Thermostat Kit w/ 20' of wire.
  • 1/2" x 24" Gas Connector Kit w/ shut-off.
  • Horizontal Vent Kit - everything needed for horizontal venting of heater through most sidewalls.

Note: An additional length of straight vent pipe may be required if back of heater is further than 12" from wall. 24,000 thru 75,000 (HD25A - HD75A) BTUH Heaters will include the ceiling mounting brackets. Ceiling mounting brackets for the 100,000 & 125,000 (HD100A, HD125A) BTUH Heaters must be purchased separately.

Dimensions and Diagrams

Dimensions, Diagrams, and Specifications (PDF)

Wiring Diagrams (PDF)


Output BTUH Application
24,600 1 to 1-1/2 Car Garage
or up to 250 SF Greenhouse.
36,900 2 to 2-1/2 Car Garage
or up to 350 SF Greenhouse.
49,200 3 to 3-1/2 Car Garage
or up to 550 SF Greenhouse.
61,500 Large Garage
or up to 750 SF Greenhouse.
82,000 Small Warehouse
or up to 950 SF Greenhouse
102,500 Small Warehouse
or up to 1250 SF Greenhouse


Many of our customers happily report that purchasing a Hot Dawg heater from the Greenhouse Megastore helped them save 50% or more off the unit price received from a local HVAC installer. However, for safety reasons and to minimize installation problems Modine strongly recommends having a licensed HVAC technician install your Hot Dawg heater. Although we are happy to offer limited technical support for your Hot Dawg purchase, we can NOT install the heater for you over the phone nor are we able to troubleshoot problems you may experience if you choose to install the heater yourself. By purchasing this heater from us, you accept sole responsibility for installation and agree to abide by Modine's limited Warranty.


Based on our experience in selling Modine Hot Dawg Heaters, we have written up a troubleshooting guide that deals with the issues we most commonly hear from customers. - Troubleshoot a Modine Hot Dawg

If you still need help, check out Modine's own troubleshooting guide.

Comparison Chart

Modine HD-Series vs. Sterling RF-Series

Specification Modine HD-Series Sterling RF-Series Comments
BTU Range 30 - 125 MBH 30 - 90 MBH Modine covers more applications
Minimum Efficiency 80% 80% Same non-condensing high efficiency
Blower Fan Units
(HDB model only)
60 - 125 MBH Not Available Modine covers more applications
Casing Paint Polyester Powder Wet Enamel Modine units will look better longer
Quiet Swept Wing Fans 100 and 125 MBH Not Available Larger Modine units are quieter
Heat Exchanger Gauge 18 Gauge 20 Gauge Modine heat exchangers are heavier gauge
Optional Stainless Steel Yes Not Available Modine covers more applications for corrosive environments
T.E. Fan Motor Standard Yes No Modine motors are protected for longer life
Power Vented X-Changer Warranty
(HDS and HDC models only)
10 Years 10 Years Same 10 year heat exchanger warranty
Sep. Comb. X Changer Warranty
(HDS & HDC models only
10 Years 5 Years Modine separated combustion units warrantied longer
Component Warranty 2 Years 1 Year Modine parts warrantied longer

Heater Warranty and Return Policy

It is the customer's responsibility to carefully inspect heaters for damage before accepting delivery since heaters are usually not returnable once delivery is accepted. Obviously damaged heaters should be refused and Greenhouse Megastore customer service contacted to make arrangements for a replacement unit. Once delivery is accepted Greenhouse Megastore will gladly provide replacement parts under the manufacturer's warranty to repair damaged or defective heaters; however this warranty does not include any labor costs associated with installing these parts. Warranty issues should be diagnosed by a certified HVAC technician since parts deemed not to be defective by the manufacturer are not available for credit back to the customer. Specific warranty policies vary by manufacturer but typically cover replacement parts as indicated above up to one year after purchase. Please contact Greenhouse Megastore customer service if you have any questions about the warranty for your specific heater.

Shipping Information

This product ships via Standard Ground Service except for the HD60 and up. They ship via Motor Freight.

Free Shipping

This item ships free - almost anywhere in the Continental United States!

On rare occasions addresses with limited access such as islands or major metropolitan areas (ie: New York City) may incur additional delivery fees; if so, you will be contacted to confirm the extra shipping cost before your order is processed. Shipments to Alaska or Hawaii qualify for free shipping to any West Coast port. Please contact us for special shipping rates from the West Coast to Alaska or Hawaii.

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Customer Reviews

Based on 7 reviews

Delivery was fast. Heater works great. Was a challenge to mount it 12ft in the air but no one died. Heats my 1200 sqft garage to need to take jacket off. Install kit was more then I needed. Simple exhaust 3ft out the back of garage, a lot of leftover parts. Repurposed some pipe for a dryer vent. Would buy again....

Legacy Review
45,000 propane unit heater

The product is first rate, fired up cleanly after a test purge of the lines. Not noisy. Warming up a 20 2+ car garage is challenging it, and I might have wished I chose a larger version. Greenhouse was super to work with, keeping me informed of the shipping delays and when it was shipping. Outstanding customer service. Thank you Greenhousemegastore.

Legacy Review
So far, so good

Received my heater within days of ordering. Arrived well packed. Haven't installed yet, but looking forward to using replacing a 50 year old heater...

Legacy Review
Hot Dawg Heater Package

I have not installed the Modine 45 yet. the only bad thing i have to say about that is there is no instructions on how to hook up the thermastat . The add-on accessory kit is not worth the purchase. The sheet metal ducts will come somewhat bent up and they are not full pipe. you to roll them up and crimp them at the seam. What a waste of natural resources, money and time. After trying to work with that "piping" for quite some time and never being able to get the sheet metal to become a pipe like the picture shows. I'm going to the hardware store and buy the true vent pipe ready to work with. Also regarding the gas vent hardware - you need a T for clean out and drip. As far as the gas pipe hardware they are really of no value. you need a long ( 6"? ) nipple coming out of the gas valve into a T with a 3"min trap and cap. All of this is in the Modine manual. you will need to go online and look for how-to videos and see what you need. So far the heater gets a 4 but the add-on package gets a 1 - for a combined rating of 3

Legacy Review
I love this heater

I bought this unit 3 years ago and installed it in my 24 X 30 two car, two story garage. I have a stair case in the back leading up to the second floor. I live in Southwestern PA and this unit runs from Nov. to April. I have the thermostat set at 65 all the time and it heats both floors without any problem. I wanted to wait before I posted my review and this unit is the absolute best thing I ever bought on line. I highly recommend this to any one debating on if they should buy one. Excellent product Hot Dawg, I recommend this unit to everyone I know looking for a great heater.

Legacy Review

Super easy to install. Works great at 8000ft elevation.

Legacy Review
So far so good

Unit has been installed for a month. Heats a 2.5 car garage with a loft no problem. Every thing works as it should. Nice strong fan and fairly quite as well.