According to Zhihu, it is useful to use cold water in Northeast China. Shui Han Bao is a new energy-saving and environmental protection product, which can effectively solve the indoor heating problem in winter in Northeast China.

Bao adopts advanced heat exchange technology to exchange heat between indoor temperature and water, thus reducing indoor temperature and achieving energy-saving, environmental protection and comfortable effects. In the northeast, heating is essential because of the cold winter. As a new type of heating equipment, Shui Han Bao has been widely concerned and applied because of its advantages of high efficiency, energy saving and environmental protection.