Was thinking about that also, but than I'd have to source the PV panel and the DC powered pump from ebay/aliexpress... and I prefer to source locally, for the guaranties (and possibly for the installation/design service from a local installer/supplier company).
After all, drainback variant seems so much more simple and easier for maintenance. And cheaper too, with glycol needing replacement after some exploitation period, and closed loop systems needing more expensive electronics in general (at least, that is as how I understand things so far).
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