Flat-plate solar collectors 3000 SU VIP and W8 2.5 S VIP are extremely economical energy producers that enable the simple use of free solar energy. The solar collectors are effective for heating of utility and pool water and for supporting low-temperature central heating systems. They are resistant to hail and contain highly permeable solar glass. According to the manufacturer, the solar collectors are suitable for installation on both sloping and flat roofs, and mounting options include in-roof fitting or ground surface mounting. The patented streaming solder technology for connecting copper pipes to the absorber increases the surface area, and thus accelerates and increases the energy transfer efficiency of the solar fluid in the collector. The gross collector area is 22.06 square feet (2.05 square meters), the absorber area is 20.15 square feet (1.872 square meters), and the empty collector mass is 83.77 pounds (38 kilograms).