This is the main kit pre-built in a very thin shell. Puts out 5.5kw of heat. Its VERY loud without any buffer on high settings. lowest setting is quite quiet. No instructions essentially. Press and rotate clockwise to turn on and press & counter clockwise to turn off. I plan to take this all in one unit apart, and put it outside so it's quiet. So in retrospect, would have got the kit variant. The construction is cheap as hell, i've never seen cast metal so cheap, i can scratch the cast metal with my fingernail. It's going to be 12 degrees so i'm glad to have this heater! thx.