Do you want to build everything yourself?
If it were me, I would use off the shelf hardware and just piece it together. I would use a Viessman collector, grundfos pump, flat plate heat exchanger then maybe PV power for the pump in place of an expensive controller.
Just a note about electric hot water tanks. You can usually order a tank in a "tall" that is obviously taller than a regular tank. I think this would be better as a storage tank as it would allow the hot water to stratify better. It may also help with your space problems
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