1.Qualification Certificate
Our products have qualified by the following tests:

1. The pressure-bearing performance test of Tsinghua University
2. The heating work performance test of Tsinghua University
3. The pressure-bearing performance test of Natianal Quality Supervision and Test center for Air-conditioner Equipment
4. The heating work performance test of Natianal Quality Supervision and Test center for Air-conditioner Equipment
5. The product quality test of Tianjin Construction Engineering Quality Test Center
6. The product quality test of Tianjin Product Quality Supervision and Test Institute

2. Warranty:

Windiya is a member organization of the Heating Radiator Committee of China Building and Metal Structure Society under the Ministry of Construction of China;
In 2003, Windiya products were recommended as the alternative product for Olympic construction engineering ;
In 2004, Windiya products became one of the top ten companies recommended by the International Copper Industry Society;
In the early 2005, the TLFE copper-aluminum compound series products designed by ourselves obtained the national patent certificate of intellectual property rights.