Instant vs Storage Geyser Cost Comparer
Instant geysers heat water only when the tap is open. Storage geysers keep a whole tank hot all day. Enter your usage and tariffs to see which one costs less to buy and to run.
Bathing, kitchen and washing combined.
Check the latest SNGPL or SSGC slab rate.
Your unit rate including taxes.
Used to spread the purchase cost over time.
| Cost item | Instant geyser | Storage geyser |
|---|---|---|
| Purchase + installation (one time) | — | — |
| Daily hot water used | — | |
| Daily running cost | — | — |
| Monthly running cost | — | — |
| Monthly total (fuel + install spread) | — | — |
| Yearly total (fuel + install spread) | — | — |
Enter your usage above to see the verdict.
Typical numbers used in the comparison
Defaults are based on common Pakistan market models. Adjust the installation fields above to match actual shop prices.
| Factor | Instant geyser | Storage geyser |
|---|---|---|
| Gas heating efficiency | 78 – 85% | 70 – 78% |
| Electric heating efficiency | 97 – 99% | 88 – 92% |
| Standby heat loss per day | None | About 1.5 kWh of heat |
| Best for | Short, spaced-out usage | Multiple taps at the same time |
How to read the result
- Compare the monthly running cost rows first — this is what you pay every month for years.
- Look at the monthly total row to see the effect of the purchase price spread over the geyser life.
- If the cheaper-to-run option also costs less to install, the choice is clear and there is no payback wait.
- If the cheaper-to-run option costs more to install, the verdict shows how many months of savings cover the extra purchase price.
Common questions
- Which is cheaper to run, an instant geyser or a storage geyser?
- An instant geyser usually costs less to run each month because it heats water only while the tap is open and has no standby heat loss.
- Which geyser is better for a large family?
- For large families that need hot water at several taps at the same time, a storage geyser is usually more practical. For small families with short, spaced-out usage, an instant geyser normally saves more fuel.
- How is the monthly running cost calculated here?
- The calculator finds the heat energy needed to raise your daily hot water from 20 to 60 degrees, divides it by each geyser type's efficiency, adds daily standby loss for storage models, and multiplies by your gas or electricity tariff.