« on: January 04, 2010, 05:05:20 AM »
I generally have drained the tun by the end. I always make up more sparge water than I need, but often have gauged the volume so it ends up essentially dry so I have less to carry to the compost bin.
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I personally prefer to heat cold (filtered) tap water to ensure getting water that I want to drink when it's been turned into beer - I don't like the idea of drinking hot water out of the water heater.
You need to take a look at Kai Troester's groundbreaking work on "cold sparging". He basically found that a lower sparge temp doesn't bot affect efficiency.