1982 Vintage Reynolds Aluminum

Frank, those panels are usually made with one contiuous piece of aluminum tubing run in a serpentine configuration. It is best to connect them in series so the water travels further through the collectors gaining more heat. This configuration will also prevent uneven water distribution between the two panels. Usually, the hardest part of installing these panels is finding a connector to attach to the aluminum tubing, since you cannot solder them. I service MA so if you have any further questions or problems just post here or give me a call. Tom, Solar Innovations, Lowell....just do an internet search.

Glad you got it going. Good idea with flare. I usually use a compression fitting with an insert to keep the soft aluminum from squishing. It may be cheaper and easier to use 3 or 4 ball valves in your piping instead of trying to find a 4 way valve. I usually set it up so you can use either your solar only, auxilary only or solar to preheat the auxilary. The condensation should eventually disappear with time as the panels get hot. It's probably from wet insulation that should eventually dry. Also, make sure the weep holes are clean and clear.
 It sounds like you have a tankless coil in your oil boiler. I usually install an aquastat control in the  domestic hot water line out to the house. I wire it to the incoming power to the boiler, bypassing the original switch. Then if the water is hot enough, the boiler stays off. Once the water gets down to 100 F or so, it turns the boiler on and the auxilary part of the system kicks in.