in his system the pump is the only heat source that is a variable, so downsizing it then permits downsizing the rad
this is useful info for larger sized systems (for one with little experience), but in WCing 'reasonable' pump choices do already consider the pump's heat input as a part of the selection process
- in any case it is moot for DIYs as they do not do WCing systems design, though they may bumble about at it
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