A small nit, it _is possible_ to generate high temperatures reasonably efficiently using solar concentrators. In fact, it is used as a means for power generatio

A small nit, it _is possible_ to generate high temperatures reasonably efficiently using solar concentrators. In fact, it is used as a means for power generation already[1]. Oh, and if you are in a tropical area, you may also use solar concentrators for free-ish hot water (with an insulating tank), and get 24 hours hot water. However, if it was cloudy the day before, it will not be a great experience, and you may need to use amn electric heater. [1] https://www.scientificamerican.com/article/new-concentrating-solar-tower-is-worth-its-salt-with-24-7-power/ https://www.scientificamerican.com/article/new-concentrating...