It is for small spaces ( bedroom, office etc. ) to have next to you to keep you warm, definitely not going to heat up a whole house but ideal for personal heating. I always start it at 600W and later turn it down to 300W for ambient heating on the not so cold winter days. The quality is very good since its made out of metal ( not plastic ) so hopefully the Carbon element will also last. Recommended if you are looking for something to have next to you.

I have had it for a month in a 10 sqm bedroom without insulation, with temperatures outside -4, and inside +5 to +10. It raised the temperature by 5 to 7 degrees on the last setting and operated all day long!
I don't know if I would recommend it to someone who wants noticeable warmth!..