Why does the hot water in the hotel get cold and hot at the peak, and it collapses!

That's the equipment used in some small hotels. Last time I stayed in a hotel in Qingdao, it was cheap, but what boiler boiled water, took a bath at 9 pm and waited for 40 minutes for hot water? . . Then I caught a cold. So now find a brand to live in, preferably a mid-range one, so at least you can have a guarantee of taking a hot bath. It's really not easy out there. If you catch a cold and get sick, you can't do anything.