Water Systems · Sizing Tool
Guess too small and you're stuck running dry between refills or tanker top-ups; guess too big and you're paying for storage, structural load and cleaning you never actually use. Enter your household size below for a tank capacity sized to how your home really uses water.
Recommended Tank Size
How It Works
Occupants × typical litres per person per day (about 150L for apartments, 200L for villas with gardens or pools) gives your household's daily demand.
Daily demand × your chosen buffer (1-3 days) covers supply interruptions or tanker delivery gaps without running dry.
The result is rounded up to the nearest tank size actually sold in the UAE: 500 / 1,000 / 1,500 / 2,000 / 3,000 / 5,000 / 7,500 / 10,000 / 15,000 / 20,000 litres.
Apartments in towers usually rely on a shared building tank managed by the developer or facilities team, so this calculator is most useful for checking your building's total capacity against resident count. Villas typically have their own dedicated tank (often split between an underground and a rooftop tank) and are fully responsible for sizing, cleaning and topping it up themselves.
Bigger isn't automatically better: an oversized tank increases stagnation risk, since water sitting in storage too long without turnover can encourage bacteria or algae growth, on top of unnecessary structural load and cleaning cost. Size for realistic usage plus a sensible buffer, not maximum capacity.
Common Questions
Average residential daily use in Dubai is roughly 150-200 litres per person, covering drinking, cooking, bathing, laundry and dishwashing. Villas with gardens or pools often use more.
A family of 4 in an apartment at about 150L per person per day uses roughly 600L/day; with a 1-day buffer that calls for a 1,000L tank (rounded to the nearest standard size). A 2-day buffer would call for a 1,500-2,000L tank.
Villas typically have more bathrooms, gardens, and sometimes pools, and store water in ground or rooftop tanks as a buffer against supply interruptions, unlike towers on continuous municipal supply.
Oversized tanks increase stagnation risk, since water sitting too long without turnover can encourage bacteria or algae growth, plus added structural load and cost. Size for realistic usage plus a sensible buffer, not maximum capacity.
Most facilities management guidelines recommend cleaning and disinfecting residential water tanks every 6 months, more often for larger shared tanks in towers.
Not the sizing math itself, but rooftop tanks are usually smaller and feed by gravity while underground tanks store the bulk supply and are pumped up. Many villas split the same total capacity across both.
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