To easily and quickly take bath and use showers by many people at open-air places such as disaster areas by constituting a device by boilers mounted on an upper part of a base and an outdoor water boiling machine with a piping having a plurality of combination taps capable of adjusting a hot water supply temperature and a plurality of various kinds of connection ports.

On an upper part of a base 1, a control panel 10 capable of operating and controlling two boilers 5, a generator 7 and pumps 6, 8 is provided. An outdoor water boiling machine 17 which is connected with the boilers 5 via two combination taps 11 capable of adjusting a hot water supply temperature and has a piping 16 having each two of pumping connection ports 2, water supply connection ports 13, temperature-controlled water connection ports 14 and hot water supply connection ports 15 is mounted. Two shower stands and two outdoor bathtubs are provided and hot water is supplied by a hot water/ water supply hose if the shower stands and bathtubs are connected with the outdoor water boiling machine 17. As a result, many people can take bath and use showers at disaster areas and other open-air places.