Permanent mount unit, offered in 28 to 96 in. lengths from 400 to 2000 watts. Heating elements are immersed in a heat transferring liquid enclosed by a copper tube casing with aluminum fins. Powder coated 12 ga. heavy duty extruded aluminum housing construction with junction boxes located on each end of the unit. An automatic thermal linear limit is used along the entire heated length of the unit. Wire guard extends along the entire outlet area of the baseboard. Commercial Brown unit has in-built wireway cover running the entire length of the unit. Field installed accessories include in-built thermostat kits, optional relays and disconnect switch among others. Available in White or Commercial Brown powder coated finish. Special colors available, consult factory. Suitable for high altitude applications. 10 Year element warranty.