Control for central heating pump TECH ST 21 with anti-stop function up to 85 centigrades

ST-21 controller is for controlling the central heating water circulation pump.

The controller is designed to: switch the pump on, if the temperature Exceeds the requested value, and switch it off - if the stove cools down. It prevents unnecessary operation of the pump, and helps to save the power (depending on the level of stove use), as well as to make the pump's life longer. This Increases pump's reliability and decreases the costs of operation.

The controller also has a function used to Prevent clogging of the pump because of sedimentation. The controller will switch the pump on for few seconds each ten days off heating season.