Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r2e2fde674cbd1ad7d5de802205b6d25fdb388854 -r4468dcb6d88bb364c60412ac368d1420adb66b27
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 2e2fde674cbd1ad7d5de802205b6d25fdb388854)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 4468dcb6d88bb364c60412ac368d1420adb66b27)
@@ -68,6 +68,7 @@
 #define DELTA_TEMPERATURE_TIME_COSNTANT_C                          8.6F                                                            ///< Delta temperature calculated from time constant.
 #define PRIMARY_HEATER_DUTY_CYCLE_PER_TEMPERATURE_C                0.015F                                                          ///< Primary heaters duty cycle per temperature in C.
 #define DATA_PUBLISH_COUNTER_START_COUNT                           70                                                              ///< Data publish counter start count.
+#define MIN_RO_HEATER_FLOWRATE_LPM                                 0.2F                                                            ///< Minimum target RO heater flow rate in L/min.
 
 static const F32 WATER_SPECIFIC_HEAT_DIVIDED_BY_MINUTES = 4184 / SEC_PER_MIN;                                                      ///< Water specific heat in J/KgC / 60.
 static const F32 PRIMARY_HEATERS_MAXIMUM_POWER_WATTS    = 475 + 237.5F;                                                            ///< Primary heaters maximum power (main primary = 475W and small primary = 237.5W).