Was hoping for a little more energy output. 

It keeps the temperature under my gazebo about ten, maybe fifteen, degrees (F) higher than the ambient temp. (in the vicinity of the heater) I live in Phoenix AZ our winter lows are about 35-45 (F) if you live somewhere that gets colder than this, do not waste your time and money on this, it will not do anything.

Burns through a 1 lb. propane cylinder in less than two hours. So it's an expensive heat source, really only good when entertaining guests. 

When mine was delivered, the box claimed that the heater could be adapted to a 20 lb. tank. However, the manual said to only use a 1.02 lb. tank. I'm not a "by the book" guy necessarily, but there shouldn't be conflicting  statements in the product information. I will look buying the necessary hardware to attach my larger propane tank, but I just received it a few days ago and haven't had the time.  

Wouldn't buy again.