Kurt Thorn — Blog https://thornlab.dev/blog/index.html Projects and experiments by Kurt Thorn. Building a thermal solar pool heater, part 1: intro https://thornlab.dev/blog/solar-heater-intro.html https://thornlab.dev/blog/solar-heater-intro.html Wed, 10 Jun 2026 12:00:00 +0000 The start of a DIY thermal solar pool heater.