HS6311 is controlled by a microcomputer, and the temperature of the liquid in tank is set by buttons. Generally, the factory setting is in the power saving mode, which can keep the difference between the liquid temperature in the tank and the set temperature within±2°C for a long time; if there are special requirements, it can be set at the factory. The constant operation mode can maintain the difference between the temperature of the liquid in the tank and the set temperature within±0.5°C.