Quote:
Originally Posted by SDMCF
solarhotairpanels, It seems your system is very similar to mine. Copper pipe all the way, Resol controller etc. My system has a diverter valve to either heat the hot water or feed heat (via a heat exchanger) into the central heating return pipe. I have 5 x 20-tube collectors and my water storage totals 900 litres made up of one 600 litre tempering tank feeding into a 300 litre tank that is also electrically heated.
My system can stagnate if power fails so the pumps can't run. I found out the hard way that when this happens soldered joints are not good to have. Connecting to the panels I used compression fittings but I had a soldered joint about 1 metre after the final panel and that leaked after the system overheated.
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I assume you are using lead free solder and I am curious what the max pressure is on your system.
There should still not be a reason for the solder to let loose during stagnation unless the pressure is too high.
That said, the OP will be using flat collectors so this should not be a problem.