After 6 years of trouble free solar heating, I got my first leak today.
It's a slow drip leak, no spraying. It is coming from under one of the 3 long seams in the panel. There's no leak under the panel, just on the top.
Unlike the tubular type solar panels, you can't just plug one of the square channels in a techno-solis panel, so I'm kind of stuck with that. For now, I've diverted water away from the panels to avoid damaging the roof. I'm thinking I might try to apply a generous amount of silicone to the seam and see if that helps. I've had good luck last year using black engine-gasket type silicone to fix a leak coming from a crack in my filter valve.
Any other ideas?
Here are the panels when they were just installed 6 years ago: