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Looking for some advise on whether my buffer tank setup is working properly. Your input is greatly appreciated.
IBC SL 10-85 G3 boiler with DHW connection on the left and zone connection on the right plus a 27g buffer tank as depicted in Drawing_1 below.
Two Azel temperature sensors are separatly attached to the zone supply and return pipes which show water temp from the supply (in) 132.8F / return (out) 115.7F as in Azel_Reading_2 below. The sensors are placed just two or three feet before the boiler
I understand this IBC will see better efficiency with coolest possible return water temp.
But for zone heating, return temp from the boiler is higher than what is coming back from the zone and shown on the boiler control in Boiler_Reading_3 in below attachment at 131F for instance (vs 115.7F off the zone return).
Is that becuase this return 115.7F cooler water temp is being elevated by the buffer tank water? Is there anything I can do so that I can get lower return temp for this boiler to condensate better?
An actual photo of the set up is attached in Actual_4 below.