Hot Water Consumption vs. Occupants

Consumption of hot water per person or occupant. Flow rate and temperature are the primary factors to be determined in the hydraulic and thermal design of water-heating and piping systems.

Type of Building	Consumption per Occupant (liter/day)	Peak Demand per Occupant (liter/hr)	Storage per Occupant (liter)	Consumption per Occupant (gal/day)	Peak Demand per Occupant (gal/hr)	Storage per Occupant (gal)
Factories (no process)	22 - 45	5 - 10	9	2	5	1
Hospitals, general	160	35	30	7	27	6
Hospitals, mental	110	25	22	5	27	6
Hostels	90	20	45	10	30	7
Hotels	90 - 160	20 - 35	45	10	30	7
Houses and flats	90 - 160	20 - 35	45	10	30	7
Offices	22	5	9	2	5	1
Schools, boarding	115	25	20	4	25	5
Schools, day	15	3	9	2	5	1