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Sorry to beat this drum again . . . but I'm wondering about the circulator speed setting on my DHW. It is on a modcon system with primary/secondary piping and a low loss header. On the boiler side, the Grundfos circulator is set to speed "2". My question, is, what speed should the circulator for the DHW be set at?
If I understand the universal hydronics formula correctly, increasing the circulator speed will give the system a greater capacity to transport BTUs to the DHW in any given time period. . . but how fast is "fast enough"? I'm assuming that trying to get the return water cool enough for condensation is not a goal with the DHW, so therefore there's nothing wrong with setting the circulator to "3" and just letting it rip. On the other hand, if a slower setting will work just as well (with a greater delta T), why not use that setting?