Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r8525a30b488d13d24af34379fe81d759026663bb -re398b4bd8bfacd05a021d6008dbccf3c38f2c5d1
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 8525a30b488d13d24af34379fe81d759026663bb)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision e398b4bd8bfacd05a021d6008dbccf3c38f2c5d1)
@@ -49,7 +49,8 @@
 
 #define HEATERS_MAX_DUTY_CYCLE                                     1.00F                                                           ///< Heaters max duty cycle (100%).
 #define HEATERS_MIN_DUTY_CYCLE                                     0.00F                                                           ///< Heaters minimum duty cycle (0.00%).
-#define HEATERS_DISINFECT_TEMPERATURE_DRIFT_C                      1.0F                                                            ///< Heaters disinfect temperature drift in C.
+#define HEATERS_DISINFECT_DUTY_CYCLE                               0.60F                                                           ///< Heaters disinfect cycle.
+#define HEATERS_DISINFECT_TEMPERATURE_DRIFT_C                      3.0F                                                            ///< Heaters disinfect temperature drift in C.
 #define HEATERS_MIN_EST_GAIN                                       0.2F                                                            ///< Heaters minimum estimation gain.
 #define HEATERS_MAX_EST_GAIN                                       5.0F                                                            ///< Heaters maximum estimation gain.
 #define HEATERS_NEUTRAL_EST_GAIN                                   1.0F                                                            ///< Heaters neutral estimation gain.
@@ -541,11 +542,16 @@
     F32 currentTemperature = getTemperatureValue( TEMPSENSORS_HEAT_DISINFECT );
     F32 targetTemperature  = heatersStatus[ DG_PRIMARY_HEATER ].targetTemp;
 
-    if ( ( currentTemperature < targetTemperature ) || ( currentTemperature - targetTemperature > HEATERS_DISINFECT_TEMPERATURE_DRIFT_C ) )
+    if ( currentTemperature < targetTemperature )
     {
         setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_MAX_DUTY_CYCLE );
         setHeaterDutyCycle( DG_PRIMARY_HEATER, HEATERS_MAX_DUTY_CYCLE );
     }
+    else if ( currentTemperature - targetTemperature < HEATERS_DISINFECT_TEMPERATURE_DRIFT_C )
+    {
+        setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_DISINFECT_DUTY_CYCLE );
+        setHeaterDutyCycle( DG_PRIMARY_HEATER, HEATERS_DISINFECT_DUTY_CYCLE );
+    }
     else
     {
         setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_MIN_DUTY_CYCLE );