I bought one similar to this, so now I have three means of heating my place. They also sell a more mobile version for the same price. the one shown here. Ebay has lots of them. Around 65.00
I love mine. I set it outside and hook the hose to the comm trailer and stay toasty for pennies per hour. They are hard to beat. I also bought the water heater version for the property, makes for a nice shower after working out there.
EBay and Amazon have oodles of them for now. I can see these becoming illegal for some reason. just look up diesel heater.