The sun takes a vacation in the off season in his location.
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Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
I am looking for Solar Heater or simply heater which can also able to heat water in winter as well as monsoon seasons, where by atmospheric temperature is less than approx 35c.
Solar hot water systems most of the time come with a regular heating option to keep temperatures in the system above 50 deg C or what ever is regarded a biologically save temperature.
This same system does offer you the option to heat your water in the Off season.
The way this all works is that you have to have a storage tank. This would be first thing to implement in your system to have a temperature controlled volume.
Check out systems in the market. I am sure there is something on CR4.