It has timer,clock,memory, leak current detection, water level detection&display(two colour LED) function etc. a. Apply 8 bit microcomputer of NEC or Toshiba to controller b. The precision of temperature control <=1°C c. The display is the double 7segments LEDs or LED module or LCD(backlight) d.  It can control valve, electric heater etc. e. The current loop communication is applied between touch panel and main board. The distance of communication is large than 100m f. It can run auto&manual heat, keep warm, auto&manual feedwater mode g. It has timer,clock,memory, leak current detection, water level detection&display(two colour LED) function etc. h. It has leak current, no water, overflow, over temperature, sensor fault, water pump fault protection etc.

Controller for solar type water heater