Question-and-Answer Resource for the Building Energy Modeling Community
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Low delta-T is nearly impossible to avoid without pressure-independent valves. It can definitely lead to increased gas usage and excess pumping energy.
I would take a look at your pumping configuration. Do you have a primary/secondary loop design or primary only? If primary only, do you have a constant speed pump or is it variable speed?
The specified boiler doesn't have any dedicated capacity control so you're relying on your pump(s) to control the boiler plant's effective capacity.
