heating un-insulated 2 car garage/@500 sq ft,/46 sq m. . first use over night, 37 F/ 2.75C outside , chest height 64 F/17.6 C inside, appears to consuming 5/8's of inch of fuel per hour / 10 l tank. noise level acceptable in a garage, though i would not want to be standing near it all day. i am planning on creating a sound barrier for the fuel pump. assembly was pretty straight forward, the most difficult was the slipping the fuel line over the nipples, until the final connection of the device slipped on very easy and the supplied clamp was way to loose/had to use a different clamp. no instructions on how to to assembly the fuel tank nipple into the tank.