System size depends on your household and usage habits. As a general rule:

👉 50 litres per person per day

This includes water for:

  • Showers
  • Handwashing
  • Dishwashing
  • Laundry (if using hot water)

Other considerations:

  • High-use homes may need 60–70L per person
  • Low-use or water-efficient homes may use 40L or less
  • For continuous flow systems, flow rate (L/min) is more important than tank size