A gas geyser is a water heating system that uses propane or natural gas to heat water for household use. Unlike electric water heaters, which use electricity to heat the water, gas geysers use a burner to heat the water. The heated water is then stored in a tank or a flow-through system.

Gas geysers are popular in areas where natural gas or propane is readily available and may be more cost-effective than electric water heaters in some cases. They are also useful in areas with unreliable electricity supply, as they do not depend on electricity to function.

The advantages of gas geysers include their efficiency, as they heat water quickly and use less energy than electric water heaters. They are also often less expensive to operate in areas where natural gas is affordable. Gas geysers are also known for their reliability and longevity, as they have fewer components that can malfunction compared to electric water heaters.