traditional radiators or one or two long copper tubes that make multiple passes, each pass being a graduated 360 bend
this amounts to alot of restriction
heatercores, of which the Big Arse, and Black Ice are examples, have heatplates, those flat pipes- these are set in parallel and so the overall restriction imposed by the heatplates' flatness is compromised
heatercores like the bix the ba and the ss3 and 4, have two passes of these heatplates, up and down, so the fittings end up on the same side of the rad (convnience)
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