Heatercores are smaller radiators used in cars. They're very low restriction and have thousands upon thousands of tiny copper strands stretched between each tube giving them massive amounts of surface area.
Generally they need fans, however very low speed fans generate very good results. Mine is cool to the touch with a pair of 7v L1A 120mm fans. If you don't mind a few degrees higher, 5v would probably give you very quiet and still low coolant temps.
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