Eli5: How does a hotel always have hot water for every occupant?

Question

Eli5: How does a hotel always have hot water for every occupant?

In: 1975

Answer 1

Basically an industril-sized boilers.
Hotels consume a LOT of heated water, and that water needs to be at the ready.
So a giant boiler keeps a LOT of water hot for baths, laundry, kitchen and pools.
Also the boiler produces a lot of vapor, which can be used again, in laundry, kitchen and heating.

Source: Have designed several Hot water/Vapor systems for hotels.