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Viessmann has a system of variable flow rate pumps, so they save on the flow pumps by switching off a well if it's not needed. And you have less load loss with shorter parallel fluid circuits than with a single long one. For horizontal collectors, they also have between 1-8 separate circuits, depending on the heat pump size, for the same reason.

by Pierre on Tue Jul 11th, 2006 at 04:17:06 AM EST
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