What kind of energy consumptions are included in "water systems" in Openstudio and EnergyPlus

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Dear all,

I am trying to model a hot water system in Openstudio in which the water flowrate of the proposed case is 23% lower than the baseline.

From the results, the energy consumption under "pumps" was 23% lower in the proposed case which sounded fair. However,the energy consumption under "water systems" of the proposed case was 50% lower than the baseline.

I am not sure what are included in the "water system" such that a 23% drop in flowrate resulted in a proportionally higher energy saving as all other input parameters in the two models were exactly the same.

I am therefore wondering if that is normal or if I have made a mistake somewhere in the inputs.

Daniel