The Hot Dawg® separated combustion garage heater pulls 100% of the combustion air from outside, making this unit ideal for workspaces such as wood shops or a garage where paint or flammable materials are used regularly. The fresh air supply reduces the common concerns about performance and durability that can come when working in a dusty or particulate-laden environment. Modine’s Hot Dawg® is available in 6 models sizes, ranging from 30,000 – 125,000 BTUs. All models can run on propane or natural gas, depending on your needs. Separated combustion (HDS) Separated combustion with blower (HDC) Available Accessories: Concentric and Two-Pipe Vent Kits 30, 60, and 90-degree air deflector hoods Vibration Isolation Kit Summer-Winter Toggle Switch