What it is
The overhead tank feeds taps by gravity; the sump stores supply from the corporation or lorries and a pump lifts it up. Tanks are plastic or RCC.
Key points
- Overhead tank feeds taps by gravity
- Sump stores incoming water
- Plastic or RCC
- Sized for family needs and storage days
Why it matters
Building rules suggest planning around 135 litres per person per day. Chennai's supply is irregular, so storage matters.
How Elamentt handles it
An overhead water tank is included in every package; the sump is quoted separately.