Types of Geyser in Pakistan and How Each One Works
Geyser is simply the word used in Pakistan and India for a water heater. There are six main types, and each heats water in a different way. Knowing how they work makes it much easier to choose the right one for your home.
Updated 11 November 2026
The six main geyser types at a glance
- Electric storage geyser: a tank of 30 to 100 litres or more heated by an electric element. See Electric Geyser Price in Pakistan.
- Fast (semi-instant) electric geyser: a small 10 to 30 litre tank that heats quickly. See Instant Electric Geyser Price in Pakistan.
- Instant gas geyser: no tank; water is heated as it flows. See Instant Gas Geyser Price in Pakistan.
- Gas tank geyser: the traditional big drum heated by a gas burner. See Gas Geyser Price in Pakistan.
- Gas + electric (hybrid) geyser: a gas tank with an electric element as backup. See Gas and Electric Geyser Price in Pakistan.
- Solar geyser: heated by the sun through roof tubes or panels.
How an electric geyser works
An electric storage geyser, sometimes called a conventional geyser, has four main parts: an inner tank, a heating element, a thermostat and insulation around the tank.
Cold water enters at the bottom through a dip tube. The element, usually 2000 W, heats it. Hot water rises to the top, where the outlet pipe takes it to your tap. The thermostat switches the element off at the set temperature and on again when the water cools. Foam or glass wool insulation keeps the heat in, and a magnesium anode protects the tank from rust. A safety valve releases pressure if anything goes wrong.
Examples: Nasgas NEG-50 Litre Electric Geyser, Canon EWDG-5021 50 Litre Electric Geyser and Super Asia MEH-50 Litre Electric Geyser.
Fast electric geyser: small tank, quick heat
A fast electric geyser works the same way as a storage geyser but with a much smaller tank and a strong element for its size. A 15 litre tank with a 2000 W element is hot in minutes. Canon calls its range FEWH (fast electric water heater), and Nasgas calls its range SEM.
These are often sold as instant geysers. They suit one bathroom or a kitchen. For a small washroom, see our small geyser for bathroom list.
How a gas geyser works: tank and instant
A gas tank geyser has a burner under a big steel drum. A small pilot flame stays lit, and the gas thermostat opens the main burner when the water cools. Fumes go up a central flue pipe through the tank, which also passes heat to the water, and out of the roof cap. A thermocouple next to the pilot shuts the gas if the pilot goes out.
An instant gas geyser has no drum. When you open a tap, a water flow valve opens the gas, a spark lights the burner, and water passing through a copper coil comes out hot. Full details: tankless geyser guide.
Gas + electric (hybrid) geyser
A hybrid geyser is a gas tank geyser with an electric element added. When gas is available, it heats with gas. During gas load shedding or low pressure, you switch on the element. This is the most popular big-family choice in cities with weak winter gas.
Nasgas DEG models list 2000 to 4000 W elements, and Super Asia GEH AI models list auto ignition. Popular sizes are 25, 35 and 55 gallons, such as Nasgas DEG-35 Super Deluxe 35 Gallon Gas + Electric Geyser and Super Asia GEH-755 AI 55 Gallon Gas + Electric Geyser.
Solar geyser: how it works
A solar water geyser heats water directly with the sun. The common type in Pakistan uses evacuated glass tubes on the roof, fixed to an insulated tank. Sunlight heats the water in the tubes, the hot water rises into the tank and colder water sinks to take its place. It needs no electricity but works poorly on foggy days and needs a backup.
We do not sell solar water heaters. If you already have solar panels, a low watt electric geyser that runs on panel power is often the simpler choice; see geyser on solar and Low Watt Electric Geyser for Solar Price in Pakistan.
Wall mounted, floor standing, vertical or horizontal
- Wall mounted: most electric and instant geysers hang on the bathroom or kitchen wall.
- Floor or roof standing: big gas and hybrid drums of 25 to 55 gallons stand on the roof or in an open area.
- Vertical: the standard shape for electric tanks.
- Horizontal: for low ceilings or above a false ceiling, such as Canon EWHH-50 Litre Electric Geyser or the Canon CA-20F series.
Automatic geysers usually mean models with auto ignition (gas) or a thermostat and timer that run themselves (electric). Smart models such as the Midea D-20EFG add phone control.
Which type of geyser is best for your home?
- Good gas, big family, house: gas tank or gas + electric geyser, 35 gallons or more.
- Weak gas or no gas, flat or upper portion: electric storage geyser of 30 to 50 litres.
- One bathroom or kitchen: fast electric geyser of 10 to 25 litres.
- Good gas, want hot water on demand: instant gas geyser, fitted outdoors.
- Solar panels on the roof: a low watt electric geyser.
For sizes by family, see the geyser size guide. For brand advice, see the geyser buying guide.
Running cost by geyser type
- Gas tank geyser: cheap to run where gas is cheap, but the pilot and standby heat use gas all day.
- Instant gas geyser: uses gas only while the tap is open, so it is usually the cheapest gas option for a small family.
- Electric storage geyser: costs more per litre heated where electricity is expensive. A timer and a lower thermostat setting help a lot.
- Fast electric geyser: heats less water, so the total units stay low for one bathroom.
- Hybrid: lets you use whichever fuel is cheaper or available that day.
- Solar: free heat on sunny days, but a backup is needed in fog.
Full numbers: geyser electricity and gas bill and gas vs electric geyser.
