Thermostats: RIO, EVO RIO thermostats for indoor airconditions constructed on the base gas membrane guaranty longtime utility and stabil measurement range of measurement 6 to 30°C Type Description RIO 2   automatical heating RIO 3   automatical heating a conditioning RIO 3L   automatical heating a conditioning + sign RIO IN   automatical heating a conditioning + but. ON/OFF RIO SI   automatical heating a conditioning + but. ON/OFF + sign RIO SW   automatical heating a conditioning + option summer/winter + stand by RIO 2V   autom. heating a conditioning + option summer/winter + stand by + option 2 speeds RIO 3V   automatical heating a conditioningv + stand by + option 3 speeds EVO digital programmimng thermostat supply 3x 1,5V acumulator , indicating of acumulator capacity input:    - ON/OFF impulse from thelephone link    - signal from outdoot temperature probe output: bistabile relé with 8A contacts (250V) 4 temperature levels:    - antifreeze temperature level    - low temperature level    - high temperature level    - manual temperature level 7 programmes available summer / winter function 7 coloures available