This greenhouse hydrofogger is a reliable benchtop unit that is ideal for most residential greenhouses. Very fine micro-droplets of water add humidity without drenching the plants. The base holds 1.5 gallons of water, or connect it to a 1/4 inch water line for automatic filling. Perfect for greenhouses less than 300 sq. ft. This price includes our humidistat for automatic humidty control, plus a water line kit.