VERY LATE UPDATE: due to me forgetting to check my emails as always
Due to some people liking the old 'argument from authority' in this case Hull Cartridge, i thought i should go straight to the top, in this case weirauch so i emailed them telling them about these discussion's that pop up every so often about whether or not the HW100 is reged or not BLAH DE BLAH DE BLAH, here was the reply.......
Dear Mr. Crossland,
we refer to your e-mail of 12.1.12 and thank you for your interest in our products.
Our mod. HW 100 features a regulator. We do not know why there are discussions in the internet.
We hope you can make your decision for one of our products.