1.Glass vacuum tube solar collector, high temperature,antifreeze,vacuum insulation. 2.Copper heat pipe,Start up quickly,transfers heat quickly, low start-up temperature,low temperature resistant 3.Food-grade stainless-steel SUS304 2B inner tank,full-automatic welding technology,under the protection of magnesium rod,it can increase of service life. 4.High pressure polyurethane foaming insulation,as the prefect density and the thermal conductivity coefficient is small, so it can provide effective heat preservation 5.The outer tank is color steel plate,and it has good double anti-corrosion function. 6.Gravity assisted heat pipe, unilateral heat transfer,high efficiency,low heat loss. 7. work under pressure,withstand pressure 1.0MPa,The sensation will be more comfortable http://www.sidite-energy.com