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Baxi condensing boiler - is this plumbed correctly?
I have a thread in the Radiant section where I received a lot of good advice that has helped me to understand and start making use of the Outdoor Reset function of my Baxi Luna HT380. That led me to examine the plumbing and logically it seems as if the flow direction is opposite of what I would expect it to be. My understanding is that the goal in a system such as this one is to maximize the temperature differential between the output water temperature going to the emitters and the return water coming back into the boiler in order to maximize condensation and therefore efficiency. Correct?
If that is the case, then why is my system mixing the hot water coming from the boiler with the cool return water before the return is pumped back into the boiler? The below picture illustrates the flow path.
From Drop Box
The yellow arrows indicate the direction the circulating pump is pulling the water. Would it not be more efficient to pull the water in the opposite direction, maximizing the temperature of the water going to the emitters, and minimizing the temperature returning to the boiler? Why is the piping connecting the output and return required at all? (I think this might be in order to allow the water to continue to circulate when there is demand for DHW and the three-way valve inside the unit closes, but I'm not sure.)
Thank you very much for your input.