The best replacement for immersion chiller is counterflow.

The best alternatives to immersion chiller are rated as following:
★★★★★  counterflow
★★★★★  plate chiller

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Speaking about immersion chiller, one probably shouldn't forget about whirlpool.

Other search terms related to immersion chiller and their ratings are:
★★★★★ whirlpool
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Google Trends

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immersion chiller
counterflow
plate chiller