• EHUMD200A delivers up to 12 Gallons per day • EHUMD300A Automatic Humidifier Control and O.D. Sensor for up to 50% more Humidity • EHUMD200A Manual Humidifier Control • UV Resistant Cabinet and Scale Control Insert • Front Cover Access for easy replacement of humidifier pad • Aluminum Humidifier Pad Treated with Ceramic Coating for Enhanced Pad Performance • Reliable Brass Solenoid Valve w/Stainless Steel Valve Seat • Field Convertible Duct Connection, Left or Right Side • Built in Summer / Winter Damper • Saddle Valve • Polyslate Gray Housing matches Furnace Cabinet Color • Envirowise™ nameplate • 110V Primary / 24V Secondary 10VA Transformer