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Camp / Dormitory Hot Water Sizing

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Input Data
Enter your project data
Size the heater for a given tank, size the tank for a given heater, or check an existing installation
Used for the supply check: electric current, gas consumption, boiler capacity or heat pump input
People who shower in the shift-change peak (not the total camp population)
Number of shower heads serving these persons
Time in which these persons shower (e.g. first hour after shift end)
Typical 5-8 min
Time a head is idle between two users
Mixed water at the head. 9 L/min ≈ 0.15 L/s (DIN 1988-300 reference); water-saving heads 6-7 L/min
Washbasin, shaving etc. in the same peak (mixed water at use temperature)
Winter design value of the incoming water
Mixed water temperature at the head
≥ 60 °C against Legionella
Total storage volume (all tanks together)
Heat output delivered to the water
Share of the tank that can be drawn before the outlet cools down (stratification, mixing)
Time available to reheat the tank before the next peak
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Calculation Results
Calculated instantly from your inputs
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Camp / Dormitory Hot Water Sizing

Construction camps are the hardest case for hot water: at shift change most workers shower within the same hour. The tank covers the peak, the heater refills it - more tank means fewer kW and vice versa. The chart shows this trade-off for standard tank sizes, and the timeline shows when the hot water would run out.

Key Points:
  • Energy balance over the shift-change peak - no empirical diversity
  • Three modes: tank → heater kW, heater → tank, check existing system
  • Shower head throughput check (queue stretches the peak)
  • Tank-vs-kW trade-off for standard tank sizes
  • Run-out minute and people served for existing systems
  • Electric current, gas consumption, boiler or heat pump input
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
Vh Hot water per person (L)
N Persons in the peak (-)
η Usable tank fraction (-)
P Heater output (kW)
trec Recovery time (h)