cost of solar hot water heater

1) Header pipe: copper pipe , Absorbing fin:Aluminum or copper ( Specification of flat plate pls see “BaoBei series “ flat-plate solar collector in my website ) 
2) Outer tank shell:coloured steel or stainless steel , 
3) Inner tank : stainless steel 3042B or 316,100L-350L 
4) Insulation: by polyurethane Thickness:55-65mm 
5) Rubber Seals and Rings: UV stabilized high temperature silicon rubber 
6) Optimal installation angle: 20-80 degree 
7) Inlet & Outlet: 1/2” or 3/4”

Flat-plate collectors are the most common solar collectors for use in solar water-heating systems in homes and in solar space heating. A flat-plate collector consists basically of an insulated metal box with a glass or plastic cover (the glazing) and a dark-colored absorber plate. Solar radiation is absorbed by the absorber plate and transferred to a fluid that circulates through the collector in tubes. In an air-based collector the circulating fluid is air, whereas in a liquid-based collector it is usually water.
Flat-plate collectors heat the circulating fluid to a temperature considerably less than that of the boiling point of water and are best suited to applications where the demand temperature is 30-70°C (86-158°F) and/or for applications that require heat during the winter months.
Flat collectors can be mounted in a variety of ways, depending on the type of building, application, and size of collector. Options include mounting on a roof, in the roof itself, or free-standing.

 Certificate: Solar Keymark, SRCC, ISO9001, CE