For those wanting a taller glass tank which would require a taller chimney it's actually relatively simple to achieve for instance on the Cleito 120, the top part screws to the top of the coil so you could make an extension that does the same and make it so the other end can accept the top part of the original setup, just that now it screws onto the chimney extension. Actually I might have a go at building the extension and say double the tank capacity to 8ml