Instant Gas Geyser Guide: How Tankless Heaters Work, Litres Per Minute, Pressure Needs, 6 to 16 Litre Sizes, Ignition, Flue Safety, Gas Saving, Indicative Rates and Installation in Pakistan
An instant gas geyser heats water only as it flows, so there is no tank to keep hot and gas is used only when a tap is open, which saves fuel and space. Prices run from about PKR 12,000 to PKR 28,000. This page covers how tankless heaters work, litres per minute, pressure needs, 6 to 16 litre sizes, ignition, flue safety, gas saving, rates and installation. It also covers instant water heater searches. For related pages see gas geyser prices, electric geyser prices and geyser pipes.
How it works
When a hot tap opens, flowing water triggers a sensor that lights the burner, and water passes through a heat exchanger and leaves hot. When the tap closes, the burner stops. There is no standby heat loss.
Indicative rates
These ranges show common retail figures.
| Model | Indicative range |
|---|---|
| 6 litre per minute | PKR 12,000 - 18,000 |
| 8 to 10 litre per minute | PKR 15,000 - 24,000 |
| 12 to 16 litre per minute | PKR 20,000 - 35,000 |
| Flue and fitting | PKR 3,000 - 8,000 |
| Gas regulator and pipe | PKR 1,500 - 5,000 |
Prices move with brand, model, size and stock. Use these ranges to judge a quote, then compare the exact model and what is included.
Litres per minute
A 10 litre per minute geyser supplies a shower, and a 16 litre one supplies a shower plus a tap. Check the temperature rise it gives at your flow, since cold winter inlet water needs more heat.
Pressure needs
Many instant geysers need at least 0.2 to 0.3 bar of water pressure to start. Roof tank pressure may be too low, so check the minimum and consider a booster pump. Low gas pressure also causes poor heating.
Flue and safety
An instant gas geyser needs a flue to the outside or a balanced flue. Never install it in a closed bathroom. Look for a flame failure device, overheat cut-out and a carbon monoxide safe design. Gas and electrical work on a geyser must be done by licensed tradespeople, with proper ventilation and earthing.
Gas saving
With no tank to keep hot, instant geysers use gas only when needed, often saving 20 to 40 percent compared with a storage geyser with a pilot flame. Short, frequent uses suit them well.
Installation
Fit it on an outside wall near the point of use, with a flue, a regulator and short hot water pipes. Longer pipes waste water waiting for hot flow.
What to check before buying
- Litres per minute. Meets your use
- Minimum pressure. Fits your supply
- Safety. Flame failure, overheat cut-out
- Flue. To the outside
Instant or storage
Instant geysers suit small households and kitchens, while storage geysers suit baths and several outlets at once. See gas geyser prices.
Before you decide
Check your water and gas pressure, choose the flow rate and plan a proper flue. A well installed instant gas geyser gives hot water on demand with low gas use.
Frequently Asked Questions
About PKR 12,000 to 18,000 for 6 litres a minute and PKR 20,000 to 35,000 for 12 to 16 litres a minute. Ask for the specification in writing so you can compare quotes on the same basis. Check the warranty terms and who honours them before you pay.
It heats only when a tap is open, with no tank to keep hot. Check the warranty terms and who honours them before you pay. Measure carefully and confirm sizes with the seller before ordering. Rates and stock change, so confirm the current position before you commit.
Often at least 0.2 to 0.3 bar of water pressure. Measure carefully and confirm sizes with the seller before ordering. Rates and stock change, so confirm the current position before you commit. If you are unsure, send a photo and the measurements and we will advise.
Yes, to the outside. Rates and stock change, so confirm the current position before you commit. If you are unsure, send a photo and the measurements and we will advise. Ask for the specification in writing so you can compare quotes on the same basis.
A 10 litre per minute model can. If you are unsure, send a photo and the measurements and we will advise. Ask for the specification in writing so you can compare quotes on the same basis. Check the warranty terms and who honours them before you pay.
Yes, we supply across Pakistan. Share the quantity, the size or rating and the place of use on WhatsApp. You get a written rate with the exact model, what is included and the warranty, ready to compare with any other seller. Rates and stock change, so confirm the current position before you commit.
Choosing an instant geyser?
Send the details and a photo. We reply with a written rate.