Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It could be better

I have owned this heater for one week. It heats my 1100 sq ft house very well. However, There is a definite problem. It will shut itself off. The manual shutoff is malfunctioning. If you walk by, it will shut off abruptly. I tried to call the company but they are in Japan and are closed after 5pm. I would tell people to reconsider this company due to this problem. The other problem I have is the getting the flames to just the minimum height. I will remind you this is brand new. I have owned this type of kerosene heaters for 15 plus years and this is the first malfunctioning one I have ever owned.