What is the system for hotels to provide hot water for guest rooms? Thank you for your answers!

Larger hotels basically have their own hot water pipes and boil their own water. Or some places can be bought from outside, and there is a system of water supply.

There is also a large area of solar water supply on the roof, but this is not convenient for customers.

Finally, press a water heater in each room. Need to be reminded that the water heater is best placed outside the bathroom, which is safe and convenient for maintenance. It won't waste a lot of electricity if it is turned on for 24 hours, but it will save electricity relatively, so guests can use it if they want.

By the way, I am a hotel bathroom, and I can stay for a long time.