1. Central Water Heater: it is suitable to all kinds of families. 2. Sort: 1) Pre-heated system type: Pre-heated hot water is reserved in tank, it can meet the demands of supplying hot water all the time. 2) Direct system type: Cold water is heated rapidly and directly, so you can enjoy it at any moment. 3. Advantages 1) Use in any time : It adopts advanced design idea and integrates with high-efficiency pre-heated patent technique, so it can warm the cold water rapidly when it flows though special pipe. It can overcome the demerits of traditional SWH, such as slow heating, long waiting time. 2) More Capacity: We adopt special exchanging heat mode, it avoids mixed effect, so cold water can be heated at any moment. 3) Strong hydraulic pressure : The hydraulic pressure is same as tap water, it is very suitable for tired person. 4) Economical and Environmental protecting: There is no pollution when it is working since it depends on sunshine. Green and economical. 5) Easy operation: It can supply water automatically, you can take it easy and enjoy good time. 6) Fashionable: The appearance is fashionable and it can great integrate with your fitment. 4. Pre-heated system type 1) Pre-heated hot water is reserved in the tank, so it can be supplied all day and all night in spite of any weather conditions outside. 2) The tank can be placed in the house, so the heat loss is lower than common one. Suitable area: the area which is very cold and have a high demand in supplying hot water. 5. Direct system type 1) Cold water is heated water rapidly and directly, so you can enjoy it at any moment. 2) It can supply you enough the hot water, adopting direct exchanging heat mode. Suitable area: Daily needs for hot water of varied families.