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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.

The table below indicates hot water consumption per occupant or person in typical buildings:

Hot Water Consumption vs. Occupants
Type of buildingConsumption per occupantPeak demand per occupantStorage per occupant
liter/daygal/dayliter/hrgal/hrlitergal
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
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