I am new to homebrewing, I made only 2 BIAB batches. I am using a 25l keg and a burner.
My pre mash batch is 21-23l since I don't want the wort to overflow when boiling. In a biab method since there is no recirculation and sparging, I think we loose 3-5l until the fermentation bucket. Due to that loss and that I can't chill the wort to the desired temp (I brew for 2 hours and try to chill for 3 hours😂) before adding the yeast, can I boil and freeze 3-5l of water and add them in my fermenter to cool my wort down?
If this is possible, can I use the grains and hops for a 25l batch in a smaller water ratio (15l) and then proceed with sparging (5l) to reach 20 l before boil and then add 5l of ice before fermentation?