This installation of a solar pool heater was just completed by Florida Solar Design Group in Cape Coral, FL. It features a total of nine solar panels (five pictured). What you see in the upper left is the vacuum relief, which allows air into the system when the pump turns off, ensuring the system can drain properly without creating negative pressure and collapsing or warping solar panels and plumbing. Note how solar panels are strapped down using strong and non-elastic woven poly straps that are gentle on the panels, but provide more than adequate tie down strength. Adhesive tile bond foam is used to strengthen the roof tile attachments in an engineered pattern around each attachment point. This, coupled with the header clamps, provides a rock solid roof attachment.