In the early 1970s, Premier Zhou went to Europe for a visit, and when he returned via Hong Kong, a progressive person gave him two 5-liter inline water heaters. After returning to Beijing, related people were instructed to develop this product. Under the attention of Premier Zhou, the door for modern water heaters to enter ordinary people's homes was slowly opened; in 1979, China's first gas water heater was successfully developed in Nanjing Yuhuan Water Heater Factory. It marks the end of the era of Chinese people using pots to boil water for bathing, and the bathing life of ordinary people has entered a new era.