Suppose the properly really needed a 30 kW boiler??? Would you then agree that it needed a larger pump or would you accept that a 15-50 was insufficient for a 30 kW boiler?
It all depends on the resistance of the index circuit (the circuit that has the highest resistance due to the combination of heating load and pipe sizes and lengths). That might well be withing the capacity of a 5 metre head pump - the section of pipework carrying 30kW load might be very short before the load is split. Also a 20°K temperature drop requires much less flow than an 11°K drop.
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