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 How to order spare parts? Why is the water bottle on Peak's hydrogen generators dark, and not transparent? Do Peak Scientific supply deionised water for Peak hydrogen generators? Comments 0 comments Please sign in to leave a comment.