How can I test how good my passive/active solar heating is?

How can I test how good my passive/active solar heating is?

How can I test how good my passive/active solar heating is?

I know that I can measure the temperature inside the water flow and the outside air temp. How can I calculate flow, efficiency and above all how good it will be at heating my home?
I do feel I have to say that this is a test panel and is not joined up to my heating just yet. Trying to perfect the system before installation.

call a heating expert

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