System type: Pumped - differential control
System was not operating. Numerous leaks in collector at header/riser locations.
Client no longer lives there. Son now lives in house. Stated that system was great and that he had plenty of hot water, etc.
Could not get into storage room where water heater and pump/control/valves were located. (Wall to wall and floor to ceiling were covered with various stored materials.)
Inspected collector on roof and could see that the collector must have been isolated since there were numerous locations that indicated some type of water/leak activity at the header/rise connections.
Exterior insulation had deteriorated. Piping was exposed in large insulation material cracks. Air vent port calcified. Freeze valve not pointing down.