All good stuff
I have electric everything, and a conventional water heater. I doubt I would ever go for an instant electric unit as they are pricey and draw huge loads to do what a natural gas unit does easily.
I can really insulate what I have to minimize storage losses. The solar would still do a great deal for me.
Now to show my wife pictures of your air collectors. We have a good south wall with no windows. If I can doll them up enough, she will probably go for it. I have 16 feet to work with
We have beloved giant trees all over, but that wall still gets a good bit of sun.