Index: firmware/App/Modes/ModeRecirculate.c
===================================================================
diff -u -r847478dd75aac2edfe27df454ac5a644b6f30040 -r1a5efe97f5f39594b45797fded52cafce92afe80
--- firmware/App/Modes/ModeRecirculate.c	(.../ModeRecirculate.c)	(revision 847478dd75aac2edfe27df454ac5a644b6f30040)
+++ firmware/App/Modes/ModeRecirculate.c	(.../ModeRecirculate.c)	(revision 1a5efe97f5f39594b45797fded52cafce92afe80)
@@ -44,7 +44,7 @@
 #define TARGET_RO_FLOW_RATE_L                   0.3                    ///< Target flow rate for RO pump.
 
 #define TARGET_FLUSH_LINES_RO_FLOW_RATE_L       0.6                    ///< Target flow rate for RO pump.
-#define FLUSH_LINES_VOLUME_L                    0.1                    ///< Water volume (in Liters) to flush when starting re-circulate mode.
+#define FLUSH_LINES_VOLUME_L                    0.01                    ///< Water volume (in Liters) to flush when starting re-circulate mode.
 
 // ********** private data **********
 
@@ -82,6 +82,10 @@
     // re-initialize each time we transition to re-circulate mode
     initRecirculateMode();
 
+    // TODO uncomment
+    //stopPrimaryHeater();
+    // TODO uncomment (SEAN)
+
     // set initial actuator states
     setValveState( VSP, VALVE_STATE_CLOSED );
     setValveState( VPI, VALVE_STATE_OPEN );
@@ -91,16 +95,25 @@
     setValveState( VRC, VALVE_STATE_DRAIN_C_TO_NO );
     setValveState( VDR, VALVE_STATE_DRAIN_C_TO_NO );
     setValveState( VPO, VALVE_STATE_NOFILL_C_TO_NO );
-    setROPumpTargetFlowRate( TARGET_RO_FLOW_RATE_L, TARGET_RO_PRESSURE_PSI );
 
     signalDrainPumpHardStop();
     requestConcentratePumpsOff( CONCENTRATEPUMPS_CP1_ACID );
     requestConcentratePumpsOff( CONCENTRATEPUMPS_CP2_BICARB );
 
-    // UV on
+    // UV reactors on
     turnOnUVReactor( INLET_UV_REACTOR );
     turnOnUVReactor( OUTLET_UV_REACTOR );
 
+    // TODO remove
+    setPrimaryHeaterTargetTemperature( 39.0 );
+    // TODO remove
+
+    // NOTE: The target flow rate should be set prior to setting the start primary heater
+    // because the initial guess in the heaters driver needs the target flow to calculate
+    // the new PWMs for the main and small primary heaters
+    setROPumpTargetFlowRate( TARGET_RO_FLOW_RATE_L, TARGET_RO_PRESSURE_PSI );
+    startPrimaryHeater();
+
 #ifndef _VECTORCAST_
     {   // TODO - test code to start the fan since we're turning the heater on
         F32 fanPWM = 0.25;
@@ -173,7 +186,9 @@
     // when enough water volume has flowed to flush the lines, transition to re-circ state
     if ( flushLinesVolumeL >= FLUSH_LINES_VOLUME_L )
     {
+#ifndef SKIP_RECIRC
         setValveState( VDR, VALVE_STATE_RECIRC_C_TO_NC );
+#endif
         setROPumpTargetFlowRate( TARGET_RO_FLOW_RATE_L, TARGET_RO_PRESSURE_PSI );
         result = DG_RECIRCULATE_MODE_STATE_RECIRC_WATER;
     }