1, material. The main material used by Zhongjia is fine copper for casting, and the main material of Qiantai copper tube is ordinary copper for casting. In contrast, Zhongjia has better materials and better quality.

2. Use of time. The service life of Zhongjia is more than 5 years, and the service life of Qiantai copper tube is more than 2 years. Therefore, Zhongjia has a longer service life and better quality.