I have been operating this for about 12 months to heat a large shed. It raises the temperature in an 8mX5m shed in about 10 mins.It is very economical on diesel and even though it is loud when it starts up, it soon quietens down(when it reaches operating temperature) and you will hardly notice it then. I would recommend stating it up and operating it at the highest setting for a few minutes even during the summer, just to burn off any carbon or stall fuel in the system. So far it has operated flawlessly and I will probably buy another.