This is a heavy-duty baseboard heater that provides specifying engineers and contractors a choice of six interchangeable high output heating elements in one low profile enclosure. This allows for more design flexibility than any other baseboard. Ideal where space is at a premium, while the extra-high heat outputs of all six elements meet nearly every heating requirement. Includes cover and 3/4 element w/3 x 3.25 fins, back panel, damper and brackets. Maximum operating pressure of element 175 PSI. 18 Month Limited Warranty.