A thermos on a desk in July can puzzle a visitor more than it puzzles the person drinking from it. The water may be plain, with no tea leaves or medicine in sight. Why choose it warm when cold water is available?
The easy answer is “tradition.” The better answer begins with a distinction that English often hides. In China, the everyday category is frequently not just hot water, but kaishui—water that has been boiled. Boiling, keeping water warm, and preferring to drink it warm are connected habits, but they are not the same thing. Their overlap helps explain why hot or warm water feels normal to many people without being a universal Chinese taste.
First, It Was Water That Had Been Prepared
A history of water shops in Republican-era Tianjin makes the distinction visible. The shops sold raw water and boiled water. But the boiled water itself came in three temperatures: boiling hot, warm, and cooled. Customers chose according to what they needed.
The important boundary was therefore not simply hot versus cold. It was water that had been through boiling versus water that had not.
Heating water also cost fuel. A neighborhood shop could boil it centrally, saving households from lighting another fire between meals. People fetched a kettle in the morning; wealthier households could pay for delivery. Similar “tiger stove” shops operated in Shanghai. Long before the electric kettle, drinking water was already tied to a system for heating, carrying, and storing it.
That history does not prove that everyone preferred warm water. In fact, the sale of cooled boiled water shows otherwise. It explains something more basic: boiled water became a recognizable, trusted form of prepared drinking water.
Public Health Made Boiling a Daily Rule
In early twentieth-century Beijing, ideas about safe water changed alongside pipes, bacteriological testing, and public-health administration. Historian Du Lihong describes a shift toward judging drinking water through bacteria and its relationship to disease. By the 1930s, municipal institutions were trying to produce hygienic water and reorganize the people and objects around it.
National campaigns spread the instruction further. The New Life Movement, launched in 1934, told people to drink only boiled water. Later public-health programs after 1949 made the practice more achievable by expanding the infrastructure that supplied boiled water.
The distinction matters. A slogan can tell people what to drink, but it cannot pay for fuel, put a boiler in a workplace, or keep water available on a long train journey. Boiling became an everyday habit when institutions supplied the equipment behind it.
The Kettle Helped Create the Preference
Once a choice is repeated at home, school, work, and on the road, it can stop feeling like a choice. A child grows up seeing water boiled, poured into a thermos, and offered warm. An office keeps a kettle or dispenser ready. A traveler carries a flask because train stations and carriages provide refills.
Political geographer Dylan Brady shows how deeply hot-water equipment became built into Chinese rail travel. By the 1990s, the taps in the journeys he studied were common enough to be unremarkable. Passengers could count on them for plain water, tea, or instant noodles.
Household technology shortened the routine further. A 2023 study based on a national survey of 57,029 rural households found that about 90 percent of drinking water in the surveyed population was boiled. Electricity—mainly electric kettles—provided 69 percent of the energy used for boiling. Those figures describe rural water treatment, not the temperature at which every person drank the water. They nevertheless show how large the practice remains and how much it depends on ordinary technology.
Here, the evidence supports a reasonable synthesis: availability can become familiarity, and familiarity can become preference. If the water you trust is routinely boiled and the water beside you is routinely warm, warm water can come to feel like the comfortable, normal option.
Health Ideas Give the Habit a Personal Meaning
Health beliefs are also part of the explanation people give for the habit. Brady notes that common wisdom often attributes hot-water drinking to a traditional aversion to consuming cold things. His historical argument does not say those beliefs are imaginary. It shows that belief alone cannot explain how plain hot water became so widely available in everyday life.
The two layers can coexist. Someone may sincerely prefer warm water because it feels comfortable to them, while the larger habit that made this preference familiar was strengthened by public-health history and ordinary equipment. That is a social explanation, not a medical claim about what temperature anyone should drink.
It also helps explain why hot water can carry a small meaning of care. When a household already boils water and keeps it ready, filling a cup for a family member or guest turns the established routine into a practical gesture. This is editorial synthesis from the documented habit and infrastructure, not a universal rule about Chinese relationships.
Common Does Not Mean Universal
Plenty of Chinese people prefer room-temperature or cold water. Brady’s interviews include a passenger who said he drank cold water in both winter and summer. His research also records generational debate around thermoses: for some people they are indispensable; for others they look dated.
Region, season, age, household habit, and setting all matter. Tea drinking can make hot water useful without creating a preference for plain hot water. Bottled drinks, cafés, refrigeration, and changing tastes have added more options. Even the Tianjin water shops remind us that boiled water could be allowed to cool.
So “Chinese people love hot water” is useful only as the beginning of a question, not the conclusion. Many people do prefer it. But that preference was not produced by one ancient belief or one national personality. It grew where public-health history, fuel and water systems, kettles and thermoses, family habit, and ideas of bodily comfort met.
The next time someone chooses a warm cup on a hot day, the temperature is only the last step in the story. Before the preference came a repeated way of preparing water—and a world built to keep that water close at hand.