Originally Posted by CopperBeechBrew
My limitation is my boil volume – I only have a 21litre (5.5gallons) pot so I can safely only boil about 18/19litres (4.8/5gallons). Not totally sure how to calculate how much to mash/sparge etc based on the grain bill from this recipe.
I've never done a partial boil, but Coppers situation has me wondering - If you mash at full volume; say 6 gallons, why couldn't you boil 4 or 4 1/2 gallons and keep the rest in reserve for topping up later instead of water? For sanitary purposes you could boil the remaining 1 1/2 to 2 gallons for 5 or 10 minutes while the initial batch is cooling, then throw it all together in the primary. The reasons he can't do a full boil on a 5 gallon batch are the same reasons I can't do a full boil on a 10 gallon batch - my mash tun will hold the volume, but not my brew kettle. My fear is the hop flavors would be affected by the smaller volume of liquid they are being infused into.