What are the minimum recommended batch sizes with high gravity beers on the G70?
40 L (10.57 US Gal) is the minimum batch size we recommend with the standard pipework but with that and 17 kg (37.48 lb) of grains (max grain bill), you are looking at about 1.100 OG.
A long boil or second mash will bump that up higher.
G70v2 the minimum batch size is 30L