🚿
Hot Water Production Sizing
FreeSize hot water tank volume and production power based on building type and occupancy.
📊DHW sizing
🛢️Tank volume
300L
🔥Production power
8,8kW
💧Daily demand
1 050L/j
Gross demand at 60°C
20 dwellings × 75 L/dwelling
1 500L/jour
Peak volume
Over 4h with simultaneity 0.7
175L
Calculated storage volume
Storage factor: 100%
202L
ΔT
60°C storage — 10°C cold water
50°C
Daily energy
61,1kWh/j
Estimated annual consumption
25,629kWh/an
💡
Storage must be at least 60°C for Legionella prevention. Distribution ≥ 50°C at all points.
📐 Sizing formulas
V_jour = N × q × Cs = 20 × 75 × 0.7 = 1050 L/j
P = V × Cp × ΔT / t
Cp = 1.163 Wh/L·°C
Énergie = V × Cp × ΔT = 61.1 kWh/jN = number of units, q = unit demand (L/d at 60°C), Cs = simultaneity factor, Cp = specific heat of water, ΔT = temperature difference.
Standards & regulations
- DTU 60.11Règles de calcul des installations de plomberie sanitaire
- Arrêté 30/11/2005Prévention du risque lié aux légionelles dans les ERP
- NF EN 12831-3Calcul des besoins en eau chaude sanitaire
This tool provides indicative estimates. Results do not substitute professional advice. Always verify with current regulations.
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