60 to 120 deg F temperature range for field installation in all units except 3 dia HUH520SA and HUH524SA|Long-lasting Comfort If you've got a constantly cold and drafty garage, basement or workshop, this heavy-duty heater provides a worthy longterm solution, Its powerful output means you can even use it to warm outdoor areas|Conforms to Your Power System Whether you need 208 or 240 V, this heater is fully compatible with your electrical system|Control Your Output Select models feature variable wattage built in, so you can set your heat output level to deliver as much warmth as you need|Directional Heating This model features adjustable louvers, so you can aim your heat directly toward your desired area and redirect it whenever your heating needs change|Install Anywhere This heater easily makes room for itself as it comes equipped with an built-in bracket for vertical or horizontal mounting