I am a home brewer and recently learned about hot cube which is not immediately wort cooling , but serving hot wort in a closed environment and a delay time for the wort to cool down to the yeast introduction temperature. I recently used this method and I love it. This saves about 30 minutes and many, many gallons of water that you would normally use with an immersion cooler. This 5 gallon hedpack is great. It's very easy to squeeze out all the air by simply squeezing the flexible plastic to prevent oxidation while the wort cools. And yet it's durable and easily transportable to wherever you want to set it up with one handle. One thing to consider is the jump plan. Since your wort stays hot/warm much longer, you should adjust to getting every 15 minutes or less of hops into the hedpack. This has the slight disadvantage that the hole isn't big enough for the hop spider, so I used muslin hop bags to keep tube formation to a minimum. If you don't have hop bags this isn't the end of the world, you just have to deal with hop deposits when pouring your chilled wort into your fermenter/bucket.
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