The Basic Sizing Rule
As a rule of thumb, one person needs roughly 150-200 liters per day for drinking, cooking, bathing, and laundry. A family of 4 typically needs a 1000-2000 liter tank to cover one to two days of backup storage.
Quick Examples by Household Size
If it's just you or one other person, 500L is usually plenty. Bump that up to 1000L for a family of three or four. Once you're at 5 to 8 people, or you've got a small villa, 2000L is the safer bet. Apartment buildings tend to need 3000L and up, and for bigger projects you're looking at 5000L, sometimes split across more than one tank.
Use Our Calculator for a Precise Estimate
Instead of manual math, try our interactive tank size calculator: enter your household size or project details and get an instant capacity recommendation with a direct link to the matching product.
