ERIF / OUTDOOR GAS BOILER is a mobile device to make hot water with two gas cartridges. Hot water is supplied from the shower when connected to a water tap, and it can be used in various outdoor scenes such as pet shampoos, winter car washes, surfing and washing of fishing tools. The body is carefully designed to the details, such as the appropriate device center of gravity and handle height for comfortable carrying, the rotation angle of the knob, and the opening and closing mechanism of the slide door. And also the shower head which fits in the palm of a hand has a unique shape and mechanism is designed to make pet shampoo more comfortable.