Water heating by a domestic water heater. Two conflicting safety issues affect water heater temperature—the risk of scalding from excessively hot water greater than , and the risk of incubating bacteria colonies, particularly "Legionella", in water that is not hot enough to kill them. Both risks are potentially life-threatening and are balanced by setting the water heater's thermostat to . The European Guidelines for Control and Prevention of Travel Associated Legionnaires’ Disease recommend that hot water should be stored at and distributed so that a temperature of at least and preferably is achieved within one minute at points of use. If there
Nanatsuiro Drops in order to return to normal. There are two primary worlds within the story of "Nanatsuiro Drops": the human world called Retroscena, and a magical world called Figurare from which the Stellar Spinners originate. There are currently two schools that teach magic within Figurare: Pramu Clovis and Sentou Asparas. According to Natsume, each year the two schools pick their top Stellar Spinners (the one from Pramu Clovis is called Prima Pramu, and from Sentou Asparas is called Prima Asparas) to send to the human world to capture seven stardrops in a goodwill competition to improve relations. "Nanatsuiro Drops" is an