HWAM 4640C HWAM 3500 The heat generated is retained The heat generated is retained by the precisely engineered and densely compressed vermiculite fire chamber panels to ensure more efficient and effective combustion with the pre heated tertiary supply wringing out every last calorie of additional heat before the combustion gases finally leave the stove Whether you install it free standing or within a larger fireplace opening the Miro 4 will certainly create a wonderful heart warming focal point in any living space floor (Ø 100 mm) Yes Distance to inflammable materials Distance to inflammable materials SmartControl™ (HWAM 4640