In China, the use of sun energy is also the most hot subject and the development of long process always, it is extensive that the domestic water heater of sun energy have become the application of sun energy , industrialize most promptly one of estates. present our country have become world the last production of sun energy of water heater first large country the water heater of sun energy popularize increase every year with higher speed. think the, present water heater of our country of sun energy concerning personage enterprise in the development of new technology and new product wait for the input of aspect need to still increase , will realize really with world "conform ", return must in standard, technology and policy and such aspect do effort.