Index: PIControllers.h
===================================================================
diff -u -ra00631eb9cb99a828d4dc5ddf644bb7947eade0b -r8d437a49a2eb86dfb38674f18a1e514998b3931f
--- PIControllers.h	(.../PIControllers.h)	(revision a00631eb9cb99a828d4dc5ddf644bb7947eade0b)
+++ PIControllers.h	(.../PIControllers.h)	(revision 8d437a49a2eb86dfb38674f18a1e514998b3931f)
@@ -7,8 +7,8 @@
 *
 * @file    PIControllers.h
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      11-Sep-2025
+* @author  (last)      Vinayakam Mani
+* @date    (last)      14-Apr-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Oct-2024
@@ -45,6 +45,7 @@
     PI_CONTROLLER_ID_D12_PUMP,                      ///< Fresh dialysate Pump controller
     PI_CONTROLLER_ID_D48_PUMP,                      ///< Spent dialysate Pump controller
     PI_CONTROLLER_ID_D5_HEAT,                       ///< Primary heater controller
+    PI_CONTROLLER_ID_D5_HEAT_OUTER_LOOP,            ///< Primary heater controller outer loop
     PI_CONTROLLER_ID_D45_HEAT,                      ///< Trimmer heater controller
     PI_CONTROLLER_ID_RO_PUMP_FLOW,                  ///< RO Pump controller to flow
     PI_CONTROLLER_ID_RO_PUMP_PRES,                  ///< RO pump controller to maximum pressure
@@ -104,7 +105,7 @@
 void resetPIController( PI_CONTROLLER_ID_T controllerID, F32 initialControlSignal, F32 feedFowardSignal );
 F32 runPIController( PI_CONTROLLER_ID_T controllerID, F32 referenceSignal, F32 measuredSignal );
 F32 getPIControllerSignals( PI_CONTROLLER_ID_T controllerID, PI_CONTROLLER_SIGNALS_ID signalID );
-void setPIControllerStepLimit( PI_CONTROLLER_ID_T controllerID, F32 stepLimit );
+void setPIControllerFeedForward( PI_CONTROLLER_ID_T controllerID, F32 feedforward );
 
 PI_CONTROLLER_SIGNALS_DATA getDebugPIControllerSignals( PI_CONTROLLER_ID_T controllerID );