Ok I am trying to get a system figured out for my stove top Ag full boil ( or as close as I can get) I understand the mash and according to the calculators I need my water ( 1.25 qts per pound of grain) at 170 degrees to get the mash temp at 152. I have an old coleman ( one of the good ones) cooler fixed as a mash tun so I assume I will lose very little heat. Now I need to figure my sparge water temp but the calculators are talking about "MASH OUT"with boiling water....I do not understand that? Is that the same as my sparge water? with ten pounds of grain the calculator said I need ( if I remember right) like 3 quarts of boiling water to get to 170 degrees? Wouldn't I just try to get the 6.5 gallon volume total ( my mash volume minus the absorption of the grains plus the sparge volume) or am I missing a step somewhere?