Ask Mr. Wizard

Multi-Batch Brewing


Bob Schepers — Leiden, Netherlands asks,

I am currently brewing with one of the Grainfather-like all-in-one brewing systems to produce between 5–6 gallons (19–23 L) of beer with each batch. One of the beers is a big imperial stout and is absolutely delicious! The only problem is that I don’t have enough of it.

I was wondering if it would be possible to produce a larger volume of the beer by adding more wort in batches. Let’s say on day one I produce a 5-gallon (19-L) batch and add it to the fermenter with yeast and the next day brew another 5-gallon (19-L) batch and add it to the actively fermenting beer? This would increase the volume of what I could produce without buying new equipment, which I don’t have the space for at the moment.

The answer is yes! This is a great way to produce more beer volume from a brewhouse of a fixed size and is commonly used by commercial brewers around the globe. The
Response by Ashton Lewis.