I'm no expert at this but I made a 48 L batch last weekend seemed to work, i can conform that making 40 L batches with this method has worked
I use a three vessel system made from three old kegs. I fill the kettle up with about 40 L of wort and put that on an open fire to boil and put the remaining wort in the hot liquor tank and fire the gas up underneath. I add my hop's to the kettle as normal and as the liquid in kettle evaporates i add the wort from the HLT till i finish by topping the kettle up to the brim and Bobs your uncle!
I used to just keep the reserve wort in an old fermenter and top up the kettle from that but keeping it boiling in the HLT saves me time.
As above, I do it often. I boil 44 litres, don't need a spray bottle, just watch it. Just before it,goes nuts (you,can tell!), I knock two of the 3 burners off completely. It's a heart pumping minute or so, but I rarely have a boilover. Once it calms down, its a strong simmer, and I can walk away
thanks all,
I will give it a go I have a lid for mashing so I don't think I will lose a heap in evaporation then.
I remember reading that BIAB efficiency starts to pan off over Xkgs of grain. I cant seem to find that number.
if I just double the recipe it comes in at 8.788kgs in brew mate
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