My "I'll deal with it when it's a problem" plan has always been to replace both tanks with a single tankless system. But we get plenty of sunlight here in Houston. We're not as far south as Mexico, but still... I hadn't given any serious thought to a solar heater. My roof is now mostly covered with solar panels (*sigh*) but there's certainly still room up there to shoehorn in one of these things.
I'm not that big a fan of solar heaters. In the warmest periods of the summer they may overheat and then you have actually cool them with an additional circuit containing cool water. It's also not always easy to bring the water circuitry on the roof.
In my opinion, it's a better idea the install install a heat-pump boiler, and also some additional photovoltaïc panels to feed it. A much simpler installation.
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