Michael Kellough
Member
These were developed in Germany nearly a century ago to heat truck cabs when the engine was off (called parking heaters). They’re usually mounted behind the cab and the heated air hose is routed into the cab.I saw some diesel heaters at a farm show in York, PA last month - they were massive. I noticed these are smaller and can fit inside a car? What about the emissions like carbon monoxide?
They’ve become very popular here (since inexpensive Chinese knockoffs are available) with the winter camping and RV folks because the heat produced is dry rather than loaded with moisture like the result of air heated with propane. In these diesel heaters air is blown across a sealed combustion chamber so there is no exhaust included. There is a separate exhaust hose which is routed outside the space you want to heat, as is the separate air intake hose.
The units I have are “all-in-one” in that the fuel tank is inside the enclosure making it totally portable, about the size of a typical tool box. The design is a little lacking in that the exhaust and intake hose exit the bottom so you have to be careful what you set it on because of the exhaust heat, or you can add some risers to the legs. There are more compact versions where the fuel tank is separate and both can be mounted on a wall projecting only five inches or so into the space. The exhaust tube can be routed through the wall via a marine port that shields the wall from excessive heat.
Lots of info and use cases on YouTube. Based on what I learned about these things I bought the 5 kW version rather then the 8 kW units because the consensus is that all of them have the same size combustion chamber and the 8 kW version just has a slightly faster fan resulting in a more realistic rating of only about 6 kW.
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