How do hotels, big hotels and dozens of suites have hot water in every room? What kind of water heater is installed?

In fact, the hotel hot water system is that one or more heating devices deliver hot water to the shower and washbasin in each room through the hot water pipe network, and at the same time ensure the hot water consumption point by using the circulating pump. Usually, as soon as the hot water system of a hotel is hot, guests can enjoy 24 hours of sufficient hot water.