Like you, OP, I am the sole beer drinker in my house, and I like variety, so my standard batch size is 2.5 gal. I brew my 2.5 gal batches in a Northern Brewer GigaWort Electric (holds 4.4 gal), and I ferment in an SS Brewtech Mini, which nicely handles 3.5 gal. As backup, and mostly for...