Calculator · Hot water
Hot-water tank sizing
Find a starting range and prepare the questions your installer needs.
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How this tool works
This retains the hub’s published capacity examples and household checks. Matching examples cover two to six people; other sizes need an individual assessment. A 50 L per-person daily-use benchmark is not a tank-size recommendation. Shower timing, reheating hours, visitors, baths, local winter performance and the exact model still need an installer’s assessment.
Sources
An illustrative day: showers around 06:00 to 08:00 draw the tank down, it reheats from about 11:00 to 15:00, and showers around 19:00 to 21:00 draw it down again. The tank bridges the time between demand and the next reheat.
Size for the busy period, not just the daily total.
Illustrative day
A tank bridges the time between demand and the next reheat.
Timing, storage and recovery rate all matter.
