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I bought a similiar unit from Home Depot and installed myself (natural gas) It's great and I can get the garage toasty in no time. As much time as I have spent in the garage over the years on cold winter (Wisconsin) nites, it was the best investment I ever made.
I am a distributor for about 30 different brands of commecial HVAC mechanical equipment. We are about to have a house built and I expect to install one of those type heaters. A "Unit Heater" like that is approved for residential garages is probably one of the best choices you could make. I sell a lot of Unit Heaters to mechanical contractors for installation in commercial jobs. They also work well for occaisonal use at a home shop. Lots of ways to get the job done but I like that one.
The only thing I found that works that is portable is the propane powered forced air construction site heaters, for a small garage you can get one around 50-85000BTU. You can use your barbecue propane tank, these things warm a garage in seconds and I just leave the garage door open. I brought in a carbon monoxide tester and it read 0 so there is no problems with toxic gases. Heres one below:
Thanks Motorhead, I am kinda leaning this way now also. Do you think it is necessary to keep the garage down open? Does Carbon Monoxide sink or float? Home Depot does have some, I may use my gift certificate to reduce the cost. Since I am renting, it has to be not permanent and I think this style will be the best bang for the buck, even though they are a little more money.
I have a little experience in this as I've been an HVAC tech for the last 30 years or so. ANY heater that burns fuel and is not vented to the outdoors can cause oxygen depletion (resulting in unsafe levels of CO), and also releases large amounts of water vapor.
Of course it does. Combustion requires 3 things: oxygen, fuel, and ignition. Take any one away and combustion does not occur. In the case of a tight room (or garage) combustion will consume the oxygen present, and release water vapor and carbon dioxide. Carbon Monoxide will result when enough oxygen is consumed to no longer support complete combustion, or when carbon dioxide is in large concentrations. And don't forget about the water vapor that is condensing on all cold surfaces including the inside and outside of your car.