Water has a specific heat capacity of about 4.2 Kilojoules per kilogram per degree Kelvin, so it would take about 6 Kilowatt Hours of electricity to heat 100 Litres of water from 15 degrees centigrade to 65 degrees centigrade. As a standard immersion heater is 3KW, so it would take 2 hours to heat 100 Litres of water.
A large number of medications may cause hiccups. Medications taken only at bedtime, such as sleep medicine, cause hiccups primarily during sleep. Other medications cause hiccups at other times of the day as well. These are examples of medications that may produce hiccups: Sleep medications: eszopiclone (Lunesta)
A hiccup is an unintentional movement of the diaphragm, the muscle at the base of the lungs. It's followed by quick closing of the vocal cords, which produces the hic sound you make. There are a large number of causes, including large meals, alcohol, or hot and spicy foods. Hiccups may also start and stop for no obvious reason. Read more on MedlinePlus.gov.