Japanese housing used to be very cold during the winter season as they were traditionally built to accommodate the heat of summer. To get into the cold bedding in the icy cold room is simply tough. When the home heating was not enough, a hot water bottle had been a perfect solution as a bed warmer; it is a container into which hot water is filled and used as a heating source. It was once being declined in contrast to the rise of electric blankets However, since the middle of the 2000s in Japan, the use of hot water bottles ...
