So, can a discount Chinese diesel heater really work? These heaters are so inexpensive compared to other name brand diesel heaters I was reluctant to believe it. But I tried it and for the past week my new camper had been impressively warm. Last night it went from 12 deg before I turned it on to 77 deg in about twenty minutes. On low setting the fan is a light whisper. The loudest part of the heater is the ticking of the fuel pump. And if you take the time to insulate it from the mounting surface you can barely hear that too. Over all I'd say it has been a success for a fraction of the price of a European diesel heater. Just take your time installing it. The instructions are decipherable with a little patience.