Dead space is the amount of wort that will not drain from the mash tun through the bulkhead because the bulkhead may be a little higher off the bottom. You can test this by putting some water in with no grain and opening the drain. Let it drain out, then carefully pour out any water left behind and measure it.
Desired kettle volume should be about 1.5 more than your finished batch size because you'll lose about that much to evaporation. So, enter 6.5 gallons.
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