Design of inner container: It is made of a crystal inner container. The material is a perfect solution of balancing the function of pressurized water, anti-corrosion and leakage proof. The steel guts (thickness: 2.2mm) and crystal layer (4mm) are seamless integration formed by the one-time high-pressure profiling. It is acid proof, alkali resistant which can withstand high temperatures, high pressure resistance and no encrustation. The product is excellent heat insulation with crystal materials at food-grade, safety and healthy. Product name: Villa Solar Water Heater Energy saving and low cost. German imported copper core with Nitrogen TiO2 coating (this technology is in world leading position in application of solar energy, sunshine absorption over 95%), make full use of solar energy, to save energy by 70-80%, therefore save the energy cost. Safe and reliable. No danger of burning, explosion, poison and electric shock common water heater has, so it is the most reliable and safe heater system. Environment friendly. Use green energy, solar energy as the main energy resource to avoid the pollution indoor. Therefore, no waste gas like sulphide, nitride, carbon monoxide and carbon dioxide is produced, following our country environment protection policy, good for country, good for people, to offer a clean and comfortable life space to our users. Advanced control and intelligent cooperation. The system adopts advanced control technology to realize remote automatic control, most economical operation, automatic fault diagnosis. Its reliability and automatic degree is much advanced than common heating system. The function realize hot water supply in all weather and all time, convenient use, completely automatic working. Long life-span and stable operation. The whole system can work for a long time without maintenance, for 20 years in normal situation.