Hi guys i keep seeing and hearing designers and engineers saying that radiators should be 50 oversized for heat pump operation at 50deg c flow temp having looked at the manufacturer s data charts for different temperatures i can see this is not true. Faral radiators would need to be over double the size to give the same output at a 50deg c flow against a flow of 75deg c. If the pump pressure is not high enough then the bypass valve will not open this will mean. 
				
			
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