Looking to buy a wood burning fireplace insert before end of December to take advantage of tax credit. Have looked at the Merrimac posts on this site, but have yet to see any data on whether you get an overnight burn. Also regarding ashes. How often so you clean them out? Also am not clear on whether it is indeed a tube unit or not. It does seem this unit should get more than 55,000 btus and the warranty is less than terrific. Our house is 2080 sq. ft. We had really wanted to consider the Pacific Energy Summit, but the given front clearance is 34 5/8". Our fireplace opening is 34 3/8". One dealer tells us it would slide in anyway. That sounds a bit doubtful. Anybody out there have an actual measurement? We were told Jotuls have a problem with parts being metric. The whole business is making me a head case. Any enlightenment is appreciated.