Modine HD100 Unit Heater
Model HD Hot-Dawg Unit Heaters: For applications requiring a low profile unit. The Hot Dawg may be installed in residential, greenhouse or commercial applications just one inch below the ceiling. Don't be fooled by cheap Chinese manufactured heaters currently flooding the market. Since 1916, Modine has provided quality heating solutions that are made in America to the highest possible standards. This superior quality matched with the following features makes the Hot Dawg unit heater an easy choice for a variety of applications. Ceiling Mounting Brackets are not included with the HD100 Unit Heater, but are available as a recommended accessory.
Wiring Diagrams (PDF)
|Model||Application||Input BTUH||Output BTUH||Vent Size||Weight (lbs)|
|HD30||1 to 1-1/2 Car Garage
or up to 250 SF Greenhouse.
|30,000||24,600||Requires 3" Vent Pipe||55|
|HD45||2 to 2-1/2 Car Garage
or up to 350 SF Greenhouse.
|45,000||36,900||Requires 3" Vent Pipe||60|
|HD60||3 to 3-1/2 Car Garage
or up to 550 SF Greenhouse.
|60,000||49,200||Requires 3" Vent Pipe||80|
or up to 650 SF Greenhouse.
|75,000||61,500||Requires 3" Vent Pipe||85|
|HD100||Up to 1000 SF.||100,000||82,000||Requires 4" Vent Pipe||125|
|HD125||Up to 1200 SF.||125,000||102,500||Requires 4" Vent Pipe||125|
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.
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|
Modine offers a 10 year limited warranty on the heat exchanger and a 2 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)
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.
This item ships free via Motor Freight Carrier - 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.
Installation was easy and it worked well right out of the box. No adjustments needed for flame or pressure.
Easy to install,works great. Very well built.
unit worked great right out of the box comfortably heating a 50: by 22; by 26 boat shed in a cold Maine winter
This unit was purchased as a replacement for an over-sized oil furnace for our 900 sf hoophouse. The heater is absolutely THE BEST! Very quiet, highly efficient, excellent heat distribution without blasting a firewall of heat across the house. The only negative thing I can say is that the installation kit that comes with the heater is basically useless, and you WILL end up having to purchase a significant amount of parts to install it properly. That being said, I'm very, VERY pleased with the heater and highly recommend it!!!
My heater and thermometer shipped out very quickly. There was a bit of a mix-up with the venting kit which had been back ordered. When I phoned, the problem was very quickly rectified. I am very happy with the polite, professional and effective response that I received. In the day and age of bad service, it was refreshing to speak to someone that obviously took pride in the job that they were doing. I am impressed with the amount of heat that this unit kicks out. Living on the Canadian prairies, my plants will love basking in its warmth this winter!