What are disadvantages of using solar heater more than immersion heater?

Solar heaters can be less effective in regions with limited sunlight, leading to inconsistent hot water availability, while immersion heaters provide reliable and immediate heating regardless of weather conditions. Additionally, solar heaters often require a higher initial investment and more complex installation, whereas immersion heaters are typically easier to install and maintain. Furthermore, solar systems may take longer to heat water compared to the rapid response of immersion heaters.