Congratulations!
A pair of 90 ft holes in rock and a 3/4 u tube less than 2" od - you done good boy!
I think the second hole addition will narrow your temp spread and level too.
Your socket weld heater looks just like mine, same color. I had to order US adaters tho for 3/4.
You may want to pressure test before dropping it in - its amazing how the pressure surges with flow changes, like pump on/off
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