Second, Article 11 of the Patent Law stipulates that after the patent right for invention and utility model is granted, no unit or individual may exploit the patent without the permission of the patentee, that is, it may not manufacture, use, promise to sell, sell or import the patented product for production and business purposes, or use the patented method and use, promise to sell, sell or import the product directly obtained according to the patented method. Therefore, according to this regulation, a solar water heater used at home is transformed by itself according to the patent scheme, not for production and operation purposes, but for personal use, so it does not infringe the patent right.