The panel(s) are repaired solar water panels I have been lucky to obtain. All 3 that I have had suffered bursts (probably from freezing) and needed brazing. One had shattered glass and the others were repaired from behind, cutting out the aluminium panel and then repaired with aluminium strips pop-riveted down the cuts.

The 160L tank is a conventional indirect heated tank (Roca) but used with solar instead of from a boiler.

You can read all about the system and how it works with a combination of solar and heat pump here:
http://ecorenovator.org/forum/solar-heating/3123-combined-solar-heat-pump-water-heater.html