If you are looking for the most possible heat output from the Matrix stove, the soapstone side panel kit is for you. Soapstone features amazing thermal release properties that allow the stove to stay hotter longer. Paired with the soapstone top panel, this will increase the heat output of the stove substantially. Soapstone's beautiful grain will truly enhance the appearance of the stove and will likely be the focal point of any room it's installed in.