Adding Heat Exchangers to Garage Solar Heater

I'm adding more heat exchangers to the solar heating system. This system captures the sun's energy in hot water, and sends it to the radiant floor in my garage/shop. However, the heat exchanger is the weak link. I'm going to upgrade it to capture more of the sun's energy.

Playlist, garage build: https://www.youtube.com/playlist?list=PLVe7nJBrjHReWHB2-Bv1jd4qUM-EJ0_1Q

Video, re-using PEX fittings: https://youtu.be/jOeBNiLdEJI

PEX Expansion Tool: http://amzn.to/2E8AyAH

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Видео Adding Heat Exchangers to Garage Solar Heater канала DavidPoz