Armaton
Member
May want to start a new thread, but since this one has been semi hi jacked will throw this out there. Heatfarmer, from your pics, system seems to be P/S with clockwise flow. Looking at your mixing valve for the six radiant loops, shouldn't the pump be on the return line before the mixing valve? That way you're pulling the hotter water from the P/S through the mixing valve, the valve then uses the amount of cooler water from the return side after the pump, and the rest goes back to the P/S. The way it stands, it looks like the pump would be fighting itself for the cooler return water. I'm not a hydronics guy and am probably way off, but...