Both the Go and the Go Edge are available in three models. Go / Go Edge 1 offers ambient and boiling water. Go / Go Edge 2 offers chilled still, sparkling, and ambient water. Go / Go Edge 3 offers chilled still, sparkling, ambient, and boiling water. The difference is that the Go Edge models are more compact and ideally complementary to your standard kitchen tap. The Go models replace your kitchen faucet, as it has a bypass function to switch to standard tap water, to save your filter and boiler.