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You have selected an HVAC System that is a Combined Hydronic System, which can only be modeled by the CEC CBECC engine if the heating boiler is not a Heat Pump. In this case you are using a Heat Pump for the boiler and this cannot be modeled.
Change your system type to a Non-Combined Hydronic system at the System level of the Tree, General tab, and model this as a Heat Pump.
At the Plant level of the tree, in the DHW Tab, model the DHW as a conventional Heat Pump Water heater.
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