3. At night time both the inlet and outlet pipes of the panels are warm. This may indicate reverse cycling??? There is no check valve fitted to stop this so how it is normally prevented I do not know.
Any further suggestions/tips before I dismantle the panels?
Heat rises.. even ovens have holes at the base..
Why don't they have drains or vent at the lowest point of these collectors.
With the heat at the Inlet and Outlet, that would be generally normal. .
How far up/down the pipes will determine what is happening..
Ie. Normal heat conduction would suggest that the fittings would be warm... foam tube insulation would help there..
Now if one pipe is noticeably warm away from the tank, then that would suggest circulation.. but WHY.. why would it be circulating if not being used..
I have to fix a Siddons system which boasted a SS tank.. Fantastic indeed..
Only problem is the steel outer - case that rusted out.. badly ..!
A new skin should fix it.. but I do wonder about the insulation.