I am looking to install a new Woodburning fireplace in my home. My dealer has two regency fireplaces that are left overs from some time ago. Onne is a regency fp90b the other is a regency warm hearth I believe z2510? I believe they were both made in 2007. Neither have ever been installed or burned. They gave me a real good price quote on them. I haven't found any real reviews on either unit. I'm wanting to get some info from others that might have knowledge of either of these stoves. One major concern to me is that they are only rated for around 40k btu. Do these things send a lot up the flue and don't put out very much heat? 40k btus seems very low amount of heat for this size of stove. Any help would be very much appreciated thank you