Gosh I hope this isn't going to be too difficult. I got on your site when I was looking for a good deal on Heliocol panels to add to a set for my customer, and I saw your Heliocol vs. Fafco thread. I could see right away the person was pushing Heliocol and was misrepresenting FAFCO. For example, if you torque the hose clamps you don't have to go back and re-tighten them every year. That's ridiculous!! (to put it mildly). I don't sell either product, but I do service them. Both systems have their plus and minuses.