I guess it was not as much fun to buy the panels from Thermo-Dynamics in Burnside, haha, but that is not what this forum is about, it seems.
Many years ago I had dreamed up and made a steam turbine for just that purpose using a tesla turbine but the amount of heat needed was pretty high to get much out of it, then you have to capture the condensate but it was a lot of fun to make.
You will have to just see how it goes with the pex. Although it is rated at 100/180F, this is just the agreed upon standard. It will take more temp at less pressure or vise versa. If it is a good tubing like REHAU, it may have higher capabilities.
Actually the cottage is near Blandford on the Aspotogan, lovely sunsets looking west (ish)
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