Geyser Size Calculator: How Many Litres Do I Need?
Free tool · Updated October 2, 2026 · By CouponTalk
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Quick answer
For bucket baths, plan about 10 litres of hot water per person per bath. A family of 2 needs a 15 litre geyser, 3–4 people need 25 litres and 5 or more need 35 litres or more. Showers use more water, so go one size up. A solar water heater should be about 25 litres per day (LPD) per person, so 100 LPD suits a family of 4.
How to use this calculator
- Count the people who use the bathroom.
- Choose bucket or shower bathing.
- If several people bathe one after another, the tank must hold more.
Reference table
| Family size | Bucket bath | Shower | Solar water heater |
|---|---|---|---|
| 1–2 people | 10–15 L | 15–25 L | 50–60 LPD |
| 3–4 people | 25 L | 35 L | 100 LPD |
| 5–6 people | 35 L | 50 L | 150 LPD |
| 7+ people | 50 L+ | 70 L+ | 200 LPD+ |
These are typical figures for Indian homes. Check the product spec sheet, and ask an electrician or installer before you buy or fit anything.
Frequently asked questions
Is a 15 litre geyser enough for a family of 4?
Only if baths are spread through the day. For four people bathing one after another, a 25 litre geyser is the better choice.
What size geyser for the kitchen?
An instant geyser of 3–6 litres is enough for kitchen use.
What size solar water heater do I need?
Plan about 25 litres per day (LPD) per person: 100 LPD for a family of 4 and 150 LPD for 5–6 people.
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