Drainage and power-off protection. The heater will stop working if it is accidentally drained, and it will be turned off to avoid collision and leakage. In addition, it is safer to use. < p>Air circulation can be used in four seasons, one machine can be used for multiple purposes, spring, summer, autumn and winter can be used, practical and economical Wide-angle and wide-area heating. It can not only supply air from left to right, but also regulate 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, overheating and power failure protection