initial,
off: _temperature=25,
open/off,
on {
    idle, 
    open/on : _temperature=25,
    active {
      boil  : _start  = Date.now() // only initialize phase
              _temperature=25+((Date.now()-_start)/1000)*1.25,
      keep  : _temperature=100;
    };

    # _water-=sec*10
    idle => idle    [color="blue"]  : dispense(sec:number);
    idle => open/on [color="red"]   : open();
    idle => boil    [color="black"] : "_water>=10";
    idle => off     [color="gray"]  : plugOff();

    # _water+=water
    open/on => open/on  [color="darkgreen"] : fill(water:number) ;
    open/on => idle     [color="purple"]    : close();
    open/on => open/off [color="gray"]      : plugOff();

    active => open/on [color="red"]  : open();
    active => off     [color="gray"] : plugOff();

    boil => keep    [color="black"] : "_temperature>=100";

    # _water-=sec*10
    keep => keep [color="blue"]   : dispense(sec:number);
    keep => boil [color="orange"] : reboil();
    keep => idle [color="black"]  : "_water<10";
};

# _water=0
initial => off;

# _water += water
open/off  => open/off [color="darkgreen"] : fill(water:number);
open/off  => off      [color="purple"]    : close();
open/off  => open/on  [color="pink"]      : plugIn();

off => open/off [color="red"]  : open();
off => idle     [color="pink"] : plugIn();