HOT SPRING is a heat recovery water heater system which produces hot water from waste heat of air conditioners. With this cutting edge innovated technology, HOT SPRING has received Invented Patent protection from the department of intellectual property in 2007 (Patent Pending No. 3282). HOT SPRING&＃039;s copyrighted "Heat Transferring" technology is the only system that can instantly generate hot water within 2 minutes after the air compressor starts and can consistently produce hot water all day long as long as the air conditioning is on.