ISTA external heater 300W (16/22)
Thermal spraying glass, speed up the heating process, higher efficiency.
External design, easy to install and doesn't occupy space in the tank.
Two sensors to exam the temperatures of water inlet and outlet.
Auto power off safety system when
-Temperature is over 36℃
-Temperatrue is 3℃ more than setting temperature
-Diffference between two sensors is over 5℃