Does all geysers have thermostat?

Not all geysers have a thermostat, but many modern geysers do include one as a standard component. A thermostat is a device that controls the temperature of the water in the geyser by regulating the operation of the heating elements or burner. 

Thermostats are commonly found in electric geysers, where they monitor the water temperature and signal the heating elements to turn on or off as needed to maintain the desired temperature setting. This helps ensure that the water remains at a consistent and safe temperature for use.

In gas geysers, thermostats may also be present to regulate the temperature of the water indirectly by controlling the gas flow to the burner. However, gas geysers often rely on other mechanisms, such as temperature and pressure relief valves, to maintain safe operating temperatures and prevent overheating.

While not all geysers have a traditional thermostat, most modern models are equipped with some form of temperature control or safety features to regulate water temperature and prevent scalding or overheating. It’s essential to follow the manufacturer’s instructions and guidelines for setting and maintaining the temperature of your geyser to ensure safe and efficient operation.