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On left-hand example is a heat flow of 120kW filled in on the "primary circuit", therefore the bottom boiler takes up 120 kW. On right-hand example is a heat flow of 120 kW filled in, but also a power percentage. As you can see on de example the power propagated on the primary circuit is 20% of 200 kW. This shows that filling in the power percentage has a priority over the filled in heat flow on the primary circuit.
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