To easily and quickly take bath and use showers by many peoples at open-air places such as disaster areas by mounting boilers 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 movable base.

A trailer truck 1 is a movable base and one-axis-two-wheel wheels are mounted at the center part. On the upper part, two boilers 5, a generator 7 and a control panel 10 are 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 12, water supply connection ports 13, temperature-controlled water connection ports 14 and hot water supply connection ports 15 is mounted. The outdoor water boiling machine 17 is connected with shower stands and outdoor bathtubs and hot water is supplied by hot water supply/water supply hoses. As a result, many people can take bath and use shower at disaster areas and other open-air places.