*Domestic Water Circulation in Buildings* - *Definition*: Domestic water circulation refers to the circulation of hot water in a building's plumbing system to provide instant hot water at fixtures and appliances. - *How it works*: - *Hot water generation*: Water is heated in a boiler or water heater. - *Distribution*: Hot water is distributed through pipes to various fixtures and appliances in the building. - *Circulation loop*: A circulation loop is created by connecting the hot water pipes bac