Love this kettle. I rarely use the pre-set features & brew according to the vendor’s recommendations. I have had no problems with water quality (filtered from fridge) nor hard water deposits (our water is soft here). When there is tannin build up (there will be with heavy use), the Breville organic tea cleaner works great. This unit is a must when I have company. I really LOVE having the ability to quickly brew water to an exact temperature when using my other teaware. I have had this unit for about 18 months.