All wall mount unit (HMR, HNVR) model dimensions are 16″W x 11″D x 11″H and hold 33 to 50 lbs of rock. Stainless steel body. Model HMR has internal controls. Model HNVR has the choice of external controls. Electric floor units (LA) are designed for commercial use and family size sauna rooms. They offer the choice of controls and contractor box. All model dimensions are 20″W x 19″D x 29″H and hold 140lbs of rock. Stainless steel body.