It adopts advanced technology such as the inner loop iron core water-cooled, which has smaller dimensions than the one-piece water-cooled generator. Furthermore, its higher protection class and stronger environment compatibility prolong generator's service life. At the same time, it can use cold water circularly, and adopts combined heat and power system to collect and use waste heat of cooling water for the needs of the houses and other applications, which makes the best use of the resources. This product is suitable for water shortage areas such as desert and so on.