No, not quite a bit. Depending on the ratio you choose to use, between (.1 and .125 gallons) per pound of grain. So if you do the 1 quart of water per pound of grain like Northern Brewer recommends in their partial mash walk-through, with the same amount of water for sparge, you end up with around 3 gallons in the boil pot. But they account for that in their fermentables bills in their recipes, and make sure that the DME makes up for the lower gravity runnings of the sparge, as well as the addition you will do in the fermenter. They describe doing a 3.5 gallon boil and topping up to 5 gallons in the fermenter. I'm not arguing that a sparge can't or shouldn't be done, just that you have to account for gravity. I don't know why that's so hard to comprehend, it's a basic concept in brewing. Here is the link for the OP. I apologize to him for this nonsense. I suggest he do more research on his own elsewhere and invest in some good brewing books. Just like the news, don't believe everything you read on the Internet.
