Replaced my old gas log set that required the flue to be open, and so sent 90% of the heat and my money into the atmosphere, I installed this set in about 30 minutes. (Hint: READ the instructions!) Make certain you set this up properly to what fuel you have installed, i.e. propane or nat gas. Burn the logs on high with your flue open for awhile, (read: hours) to get rid of the "chemical smell" or to "cure" the concrete logs. After that, I shut my flue, set the thermostat, and WOW, it heated the north end of the home good! The floor space on the first floor is about 1,800 sq feet. The room it was installed in had two exterior doors (one "door" is actually two...french doors, to the back yard, other is a normal exterior door to the front yard) and a door to the garage, all drafty, about 30 years old. I am buying another one for my living room (opposite side of the home) and I know atleast 2 others that have purchased these and love them. Few products are worth the money you pay, most don't work 100% as advertised, but I think this one is one of them. Never had a problem with flames going out. (product set to proper fuel?) and I dont think any gas fire place can hold a candle to the looks, smell and feel of a real wood fire. But this one is alot CLEANER, more efficient, and looks ok to me. I have owned this product for atleast 3 months, and it has been "on/running" 24/7 with no issues.