Estimates the required storage water heater capacity for household needs.
The water heater (boiler) capacity calculator determines the minimum tank size or flow rate needed for a household based on the number of users, shower duration, and flow rate.
Daily hot water volume (L) = People × Showers per day × Duration (min) × Flow rate (L/min) Tank capacity needed ≥ Peak demand volume Heating time (hr) = Tank volume (L) × ΔT (°C) × 0.00116 / Heater power (kW)
3 people, 1 shower each per day, 8 minutes, showerhead flow 8 L/min. Daily volume = 3 × 1 × 8 × 8 = 192 L. A 200 L tank (or 80 L tank with 2.5 kW fast reheat) covers this comfortably.
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