Geyser size and type: instant or storage, and how many litres?
People search this as “how many litres geyser for bathroom instant vs storage” · updated 2026-08
Short answer
For bathing, a 15 litre storage geyser suits one to two people, 25 litres suits a family of three to four, and bucket bathers can manage with 10-15 litres. Instant geysers (3-6 litres) are only for kitchen sinks and quick hand washing — they cannot fill a bucket at a comfortable temperature quickly.
- Instant geysers save space and standby heat but cannot supply a shower.
- In hard water, a glass-lined or titanium-coated tank plus an anode rod is what decides tank life.
- High-rise flats need a geyser rated for 6-8 bar pressure.
Sizing
| Use | Capacity | Type |
|---|---|---|
| Kitchen sink | 3 L | Instant |
| 1 person, bucket bath | 10-15 L | Storage |
| 1-2 people, shower | 15 L | Storage |
| 3-4 people | 25 L | Storage |
| Bathtub / large family | 35 L+ | Storage |
Checks before you pay
- Tank warranty separately from the product warranty — 5-7 years on the tank is a good sign.
- Pressure rating of at least 6 bar for flats above the fourth floor.
- 5-star BEE rating: standby heat loss adds up over a whole winter.
- Rust-proof outer body if the bathroom stays humid.
Common follow-up questions
Does a higher wattage geyser heat faster?
Yes, but it also draws more current. A 2,000 W 15 L geyser heats in roughly 8-10 minutes; check your wiring can take it before choosing 3,000 W.
Go deeper with the full guide
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