The thesis adresses automation of house heating system with microcontroller Aduino. Project is an upgrade of before made automation, where you had to define parameter values manually and microcontroller wasn't connected to network. With addition of Ethernet shield and network connection are parameters defined over graphical user interface based on a web server and HTML page. In manual mode you can turn on or off water pumps by pressing the corresponding switches. In automatic mode pumps work by defined control algorithm. Beside all that it allows to draw graph of measured temperatures in date periods, saving the graph to your computer and with indicators telling us the state of water pump.