What are the dimensions of the hydrogen water bottle? The hydrogen water bottle can be ordered separately from the generator. It comes in 2 sizes: 4L: 15x15x35cm (LxWxH)8L: 20x20x42.5cm (LxWxH) Can't find what you are looking for? Contact us here or phone your local tech support help centre. Related articles Exhibitions department Comments 0 comments Please sign in to leave a comment.