Isn an electric geyser more convenient to use?
May be it appears that way because we were used to it in the absence of a better choice. The electric geyser (storage type or immersion type) takes at least 15 to 20 minutes to heat water. As you start using the water from electric geyser, the cold water keeps mixing with the hot water in the geyser and after drawing around 15 to 20 liters, you may get only cold water in the middle of a shower, which could be very irritating.