Build Solar Water Heater

There are many sources of renewable energy, and I am partial to one kind because I work in the industry(I won’t say which one until I pick best answer-because I don’t want to alter the results, but I was wondering what type comes to mind first for most.
Thanks for your answers.

what are the basic factors to be considered while installing a passive type solar water heater? How does one calculate the size of panels and storage tank required? How does one calculate the long term economic returns when installing such a system?

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