In Yunnan, Guangxi, Hainan, Vietnam, Cambodia and other places, insulated solar hot water bottles are required in winter. In winter, the temperature is 8 to 10 degrees Celsius, with 4 to 5 hours of sunshine. You can use it to take a bath and wash clothes at night. The super insulated solar hot water bottle produced by Yueyang Taibang can maintain the temperature until 11 p.m.-1 p.m.
Ordinary solar hot water bottles are not effective in winter and do not maintain heat.
Ordinary solar hot water bottles with a factory price of a few yuan generally have a lifespan of 1-2 years or less, while red mud bags cost at least 3-5 years. much more expensive.