Solar Thermal Evacuated vs Wagner Panel

I came across this product while doing some research and I am wonder if its to good to be true. I would like a solar thermal installation but I already have 12 PV's installed. I have always consider evacuated tubes to be the best option for the UK. However its likely I may need to have direct-flow tubes fitted horizontally, rather then the heat pipe type.
The Wagner L20 AR Flat Plate product seems to have very good specifications, that seem comparable to tube performance figures. Any comments welcomes on these panels or Tubes to Flat discussions in general.


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