Hello, We have narrowed our selection down to 2 wood inserts that we like the look and the specs. We prefer the look of the Regency over the Enviro but more concerned about actual heat output and burn time as we have always run the fireplace over night then fill it back up in the morning. Lots of people seem disappointed about the Regency claim of 14 hours which we do not expect to get anyway. Looking for at least 8 hours of hot coals left and enough heat output for a 2500 sqft house.Do not hear anyone complaining about the heat thrown off this model. The Enviro has a lot less technology and things to go wrong. A simpler system might be less problematic and the fan opening looks a lot larger to throw more heat into the room. Anymore info on these 2 inserts would be great as we are going to choose one this week. Thank You.