most of the pumps heat is NOT "removed via air." mag-drive pumps are generally pretty inefficient, and a lot of the power is converted into heat which warms the water. very little heat is actually transfered from the pump to the surrounding air (this depends on what type of pump you have. i'd suspect a direct-drive pump would get pretty warm and require air-cooling of the motor). putting heatsinks on a mag-drive pump would be pretty useless.
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