Thermostat for recycle pump at heating system

   For heating system using wood or another solid combustible materials who use recycle pump, I design a simple thermostat to power the pump just if water temperature is bigger than desired temperature.
   Schematic is simple

   Tom, a friend of mine, made practical system with Arduino Nano on PCB:

Using DS18B20_thermostat.ino sketch system work like in this photo:

- when temperature of heating water is bellow than desired temperature pump is off

- when temperature of heating water is bigger then desired temperature pump is powered.

Tom made more tests with sistem:

    Tom made 2 movie (speak in romanian language):

- termostat cu Arduino

- Termostat pentru pompa de recirculare la centrala pe lemne