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Hot Water Consumption per Occupant

Consumption of hot water per person or occupant

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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:

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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