The kettle has a good capacity and fulfills the hot water tap. It can also be filled with boiling water, although this is not recommended by the memorandum (because of the risk of burns when filling? In any case the product seems to withstand boiling water). She heated long (several hours, even until the morning with boiling water in the evening). Very effective for warm feet into the bed or simply hands when you come back from outside. Think about empty the next day and let dry if it smells a bit musty. The use of boiling water reduces these problems with respect to hot tap water. Only regret: I do not like the red and had no choice of color. But I was looking for a quality water bottle above all and I do not regret my purchase ...