Rather than using multiple electric heaters to warm up my 2-car garage, I'm thinking I should install a ceiling mounted natural gas heater. I have a more than adequate over-sized gas line and meter coming into the house because we have two gas fireplaces, a gas range, a whole-house Kohler genset, and a plumbed large gas grill. The grill is rated at 58,000 BTUs and we don't use it in the Winter anyways, and the genset would only get used in an emergency. The garage is about 550-600 square feet and I'm thinking a 50,000 BTU heater would suffice to warm up the garage on those days when I want to go work on my '69 Camaro. Ideally, I'd like to have a horizontally mounted stack that exits out the back wall of the garage. If I can get it up to say 65° I'd be a happy camper. I'm in Western Mass and the garage ceiling is insulated and the 16' door is an insulated door. I haven't checked the two outside walls for insulation, but if they weren't I guess they could blow in insulation from the top.\n\nI know there's two types of heaters, one type has a dual pipe... intake and exhaust, the other just has an exhaust. I'm leaning towards the latter, I'm not living in the garage LOL... I just want to be able to warm it up maybe on weekends or when I need to do something to the car. Northern Tool has some decent looking heaters in this category. I might hang it myself, but have a licensed plumber tackle the pipe/connection bc in MASS you need a permit for the installation of any kind "permanent" gas heater.