Amazon calculates a product's star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
We thought this dispenser would have hot, cold and normal temperature according to the manufacturer website. However, it only has cold and hot. There is no room temperature. Also, it is loud when pumping the water and remains loud all day when it is on. So far, it appears to be okay if we are able to ignore the sounds.