Tw-h80s2a Manual | Toshiba

Hard water can cause calcium scale to build up inside the pot. The manual recommends using citric acid (often provided with the unit) to clean it:

Ensure the machine is placed on a level, solid floor. Use the adjustable feet to stabilize it if necessary. toshiba tw-h80s2a manual

To improve the taste of tap water, the unit features a dechlorination cycle. During the boiling process, the lid opens slightly to vent chlorine smells and odors, ensuring the final product tastes fresh and clean. Hard water can cause calcium scale to build