Since install, I've had to keep upping the grains of hardness setting on my water softener and it still isn't the best. I figured the amount of water being used from the well now changed the makeup of the water... I attached a pic of some temp sensors I have been mounting to pipes to see if anything shows up. Green: Closest to DHW preheat tank, tank side of in line valve Yellow: 2nd closest, after green, 'cold' side of valve Blue: 3rd in line, after yellow, closest to cold water Red: Disregard, testing on one return loop of radiant floor Screenshot is with the valve open, desuperheater enabled. If I close the valve, the yellow and blue rise and stay at ambient with no water usage. Thoughts, questions?