One of the questions we hear most is: “What size tank does my home need?” The answer depends on the number of people, daily consumption and how many days the water supply is cut in your area. Here is a simple way to calculate it.
Step 1: Estimate daily consumption
As a rough rule, one person at home uses about 150–200 litres per day for drinking, cooking, showering and cleaning. Multiply this by the number of people in the family.
Example: a family of 5 × 150 litres ≈ 750 litres per day.
Step 2: How many days of reserve do you need?
If water arrives regularly every day, one to two days of reserve is enough. If the supply is cut for several days, multiply daily use by the number of days without water.
Example: 750 litres × 2 days = 1,500 litres, so a 1,500 or 2,000 litre tank is suitable.
Common sizes and their uses
- 300–500 L: small apartments, few people or as an extra tank.
- 1,000–1,500 L: the most common size for an average family.
- 2,000–3,000 L: large houses or areas with longer water cuts.
- 5,000–30,000 L: buildings, projects, farms and industrial facilities.
Tips before buying
- Make sure the roof or base can carry the full tank (every 1,000 litres of water weighs about one tonne).
- Measure the available space and height – each tank has exact dimensions in the datasheet.
- Consider two medium tanks instead of one large tank if space or the base is limited.
Conclusion
Choosing the right size prevents water shortages at home and protects your roof from overload. If you are unsure, contact the BAZ Plastic sales team with your family size and number of water-cut days and they will recommend the right capacity.
Frequently Asked Questions
What size suits a family of 6?
About 900 litres per day; if water is cut for two days, a 2,000 litre tank is a good choice.
Is a horizontal tank better than a vertical one?
A vertical tank saves floor space, while a horizontal tank is lower in height and suits places with low ceilings, under stairs, or vehicles and trucks.
Looking for a reliable water tank?
BAZ Plastic tanks are made from 100% virgin raw material, with multiple layers and a warranty of up to 20 years.
