This 9kW 240V 1PH Heating Element is required for heating operation on Mr.Steam's Residential MS model MS400 steam bath generators that utilize 240VAC 1PH voltage. NOTE:To preserve the originality, operation and safety of replacement parts, this product is not returnable. compatible with Mr.Steam's Residential MS model MS400 steam bath generators that utilize 240VAC 1PH voltage Fits Series: MS400 (that utilize 240VAC 1PH voltage)