I do see a valve underneath the machine, is that for the water boiler or the steam boiler? How do you drain both boilers with only one valve? I saw the instructions for the Breville Dual boiler and they have two valves. Also how do you actually release the valve?
Also do you still follow step...
Have you figured out how to descale? I have the same machine and I am wondering the same too. I do use treated water only, does that mean I don't need to descale at all?