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Good work!
I have a couple of these panels I need to rehabilitate.
Tap water might be OK for experimentation, but it will start to work on coroding the interiors of the copper pipe. Those risers are pretty small and it won't take much to clog them up. If it appears there is any restriction you can just run some vinegar through the collector for awhile to dissolve it. If you want to run with water be sure to use pure distilled water. If you decide to permanently install it on the roof a better way to go is propylene glycol in a closed loop system heating the water in a separate tank. With this type of system it's important to make sure that the pump is running whenever the sun is out in order not to let the fluid stagnate in the collector, or it will overheat and become acidic which screws everything up.
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