Cove.tool refers the standard NEN 2916 for the calculation of Hot Water Distribution losses.
        a) Taps within 3 meters of heat generation: Hot water distribution network can                  reach up to 3 meters from the generation plant
        b) Taps further than 3 meters of heat generation: Hot water distribution network                can reach more than 3 meters from the generation plant.
        c) Circulation System or Unknown: Hot water circulation system that moves hot                water to fixtures quickly without waiting for the water to get hot.

        The distribution losses lead to increased energy usage intensity (EUI) related to DHW. Following efficiencies which are listed in NEN 2916 helps to quantify the distribution losses for the chosen system. 

Did this answer your question?