Drainage and power-off protection. The heater will stop running if it is accidentally drained and shut down to avoid collision and leakage. It is also safer to use. Air transport can be used in the four seasons: spring, summer, autumn and winter, one machine can be used for multiple purposes, practical and economical. Wide-angle and wide heating beach. It can not only provide air from left to right, but also adjust up and down. It is convenient for heating. Hot air can be distributed in all directions, and the whole family can share the heat with one machine. Fourfold safety protection, no open flame operation, safety grille, flame retardant material, protection against overheating and power outages