SKU: 57535454909

Hot Dawg® Separated Combustion Heater

Sale price$789.75 Regular price$877.50
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

Hot Dawg® Separated Combustion HeaterFreight Savings For large heater orders over $10,000, freight savings are available by contacting our sales team at 1 888 281 9337. Model HDS Hot Dawg Separated Heater Combustion Units are a convenient and affordable way to keep your greenhouse plants warm for winter growing. The separated combustion Hot Dawg draws its combustion air from outside to ensure that the unit always has plenty of fresh, clean air to breathe. This fresh air supply reduces

Freight Savings
For large heater orders over $10,000, freight savings are available by contacting our sales team at 1-888-281-9337.

Model HDS Hot Dawg® Separated Heater Combustion Units are a convenient and affordable way to keep your greenhouse plants warm for winter growing. The separated combustion Hot Dawg draws its combustion air from outside to ensure that the unit always has plenty of fresh, clean air to breathe. This fresh-air supply reduces common concerns about dusty, dirty or humid applications. In addition, by drawing the combustion air from the outside, the overall heating efficiency is increased.

Advantages of Hot Dawg Space Heaters

The Hot Dawg® by Modine is designed to generate heat without the expense or hassle of a regular HVAC setup. You don't even need electricity! Here are some of the ways these heaters outperform other units:

  • 100% outside air for combustion
  • Sealed compartment protects combination gas control
  • Ignition control
  • Manifold and burner
  • Horizontal or vertical concentric venting
  • 80% thermal efficiency
  • Field convertible to propane
  • 100% shutoff with continuous retry

In addition to greenhouses, the Hot Dawg is also an excellent combustion garage heater, It's available as an indoor propane heater, natural gas heater or LP (liquid petroleum) heater with a 10-year warranty.

Install a Modine Hot Dawg separated combustion heater to keep plants, vehicles, equipment and people warm during the winter. Also known as a sealed combustion heater, these units have a design that uses outside air for the combustion process with a secondary exhaust vent. This makes the heater more efficient and prevents damage from indoor air contaminants. It also stops dangerous gas exhaust products from entering the air you and your plants breathe. No electricity is needed, letting you install the heater wherever you have the appropriate venting.

Greenhouse Megastore has a variety of Modine combustion space heater models that burn at 80% efficiency. Maximum hourly output ranges from 24,000 BTUs (single-car garage and small greenhouses) to 100,000 BTUs (any open structure up to 1,200 square feet). You can order a natural gas, liquid petroleum or propane heater that is ultra-quiet. The heat exchanger has a full 10-year warranty, so you can count on its operation for any growing or living space.

Hot Dawg Combustion Space Heater Features:

  • Less maintenance in dusty environments.
  • Improved efficiency by using outside air for combustion.
  • Greater durability in "hostile" environments (environments possessing substances that may deteriorate the performance of the unit).
  • External thermostat and gas connections.
  • Hush-puppy quiet operation.
  • Uses natural, liquid petroleum or propane gas.
  • Certified for residential, commercial and industrial use.
  • Low-profile design and neutral color to blend in with décor.
  • Lightweight - easily installs one inch from the ceiling with only two angle brackets (included).
  • Install quickly and easily with field wiring connections and knockouts for quick access to gas and electricity.
  • Standard power exhaust simplifies side-wall or roof venting with small-diameter vent piping.
  • Versatile design allows for right- or left-hand controls and installation. Gas, electrical and flue connections can be changed from one side to the other by simply flipping the Hot Dawg over.
  • Permanently lubricated motor for trouble-free dependability.
  • Full 10-year warranty on the heat exchanger (2 years on all other components).

Dimensions and Diagrams

Dimensions, Diagrams and Specifications (PDF)

Modine Greenhouse Heating Solutions (PDF)

Wiring Diagrams (PDF)


Performance Specifications

Model Input BTUH Output BTUH Vent Size CFM @ 70°F
HD30 30,000 24,000 3" 505
HD45 45,000 36,000 3" 720
HD60 60,000 48,000 4" 990
HD75 75,000 60,000 4" 1160
HD100 100,000 80,000 4" 1460
HD125 125,000 100,000 4" 1850

*Do not locate any gas-fired unit in areas with chlorinated, halogenated or acidic vapors in atmosphere.


Installation

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 cannot 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.


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

Additional Information

Manual

Residential Owners Manual (PDF)

Warranty

Modine offers a 10-year limited warranty on the heat exchanger and a two-year limited warranty on all other components. Please note this warranty covers parts only and does not cover any labor costs associated with repairing the heater. View Warranty (PDF)


Product Video


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. Heaters with obvious damage should be refused and you should contact Greenhouse Megastore customer service to arrange 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 Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 57535454909

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4.4 ★★★★★
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Product Reviews
C
Verified Purchase
Cheri Who
Draper, US
★★★★★ 5
Chuckit!! Just Chuck it!!
Style: Sport, Size: Large
Chuck it further than your skinny little arms can chuck it. Doggo loved this, I loved this and when we were done Doggo promptly hid it under the porch so I couldn’t take it from him. It’s not a squeaky toy, it’s for fetch. You wing it out toward the yard and it flies, bounces if it’s lucky then is attacked in an adoring manner. We like it!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
D
Verified Purchase
Don L. III
Phoenix, US
★★★★★ 5
Great to exercise the dogs!
Style: Sport, Size: Large
Great to throw 3” KONG Ball (RED) with hole thru it! The thrower is the best to exercise dogs with retrieving balls!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
M
Verified Purchase
Michael F.
Dallas, US
★★★★★ 5
The best way to tire your dog out in the dark
Size: 25in
My 7 month Golden Retriever puppy has way too much energy. And I go to work in the dark, and come home in the dark. This was the solution. First of all if you get this, I suggest a UV flashlight to charge it. Most of these phosphors for glow in the dark items have very strong optical absorption in the UV, and the UV will charge both the ball and the launcher in seconds. I shine the light at the launcher with the ball in it, since you can then see where the launcher is when you are trying to load the ball. I use this UV flashlight, which takes qty=3 AA batteries. https://www.amazon.com/gp/product/B01A5KLUG2/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 I have never used a launcher before and I learned it within about 10 throws. It is easy to have a basic competence. I live in a suburban area and I send the ball across front lawns, trying to avoid the street, or hitting my neighbors parked cars. I can consistently do this now with the launcher, which is a big improvement over the old tennis racket and ball routine. I got the 25" medium ball launcher, which also works for tennis balls. The scoop goes easily over the Chuck-it balls. My older dog is not taking to it, since he was trained to sit and give the ball. This works better if you have the dog drop the ball so you can scoop it. The glow in the dark ball has 2 holes (think wiffle) that have a low pitch whooshing whistle as you toss it. This is great for my puppy who gets easily distracted as the glowing ball and the noise it makes really helps him propery mark it. Overall I think the dog retrieves better in the dark as there are fewer distractions, and I feel better about the dark for retrieving since there is no traffic early in the morning (both foot and auto). The ball has some squish to it and the pup loves to chew on it as he brings it back. I do not let him play with it when we are not retrieving...better for him to destroy his chew bones and ropes. It took him about 5 tries to get the hang of picking up the new ball. The older dog (13yr old golden) does not like it and only goes for tennis balls. I can tell already this is my puppy's favorite toy ever. I put it up out of reach across coat hooks in the entryway, and that pup will sit there staring at it, then at me, then at it hoping that I will go out and use it. With bounces and rolls and the puppy missing the grab this has gone 100-150' across 3 front lawns. I am looking forward to giving it a go in the park on the weekend. Main problems with the pup now are he likes to parade around me with the ball when he comes back, then lie down and try to give it a proper chew. If I use my launcher to pick it up, I have to put my foot between him and the ball since he will try to get it back fast. Overall this launcher means faster pickup, faster release, more accurate release, good distance, and a better run per time allocation than the old tennis racket and ball routine.
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Reviewed in the United States on January 29, 2020
B
Verified Purchase
Babs Kilgore
San Leandro, US
★★★★★ 5
Chuck a Glowing Ball
Size: 18in
This baby ball checker is good for a medium sized dog because of the size of the ball which glows in the dark. It is a handy feature for playing with the dog at night. It is fairly priced, durable. It doesn’t squeak and is not made to be chewed. F your dog likes to run around after balls this should be good for you.
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Reviewed in the United States on December 19, 2025
C
Verified Purchase
Country Heaven
Battle Creek, US
★★★★★ 5
This is the one to buy if you wish to get the most out of your arm and give the most to your dog
Size: 25in
The pro series must be made of a higher quality plastic than the original version, as the stiffness of the Pro series chucker allows for way more distance with less effort and greater control (for line drives, high arching throws, and bouncing grounders). Your dog will thank you endlessly for choosing the Pro over the regular (original) models. I have an old legacy original model that I keep in my truck for road trips that works reasonably well, though not as well as the Pro version. Here’s the thing: Before purchasing the Pro model, I ordered another original version (same length, 25”) and was instantly disappointed in how soft and leverageless was the chucker. Either my (original) original one (a Goodwill find) stiffened over the course of years, or the newly made “original” versions are now made with a softer kind of plastic. This soft chucker led to a disastrous throwing experience for my dog. Instead of thrilling at each throw and the lightning fast response of my dog, I hated every throw. I returned the “original” model and ordered the only 25Pro model I could find at 25” on Amazon… a glow in the dark version. There may be a benefit to the glow in the dark feature, but I don’t really care about that. It’s the leverage that I wanted and that’s what I got with the Pro version 25”.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 22, 2025

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