Index: firmware/App/Modes/ModeWaterPreGen.h
===================================================================
diff -u -rd19f70066e9d3503c5d2d4fd26a43c7dfa00f873 -r28b6e281605c1a944c982d0ec7dcdb6f28aac82b
--- firmware/App/Modes/ModeWaterPreGen.h	(.../ModeWaterPreGen.h)	(revision d19f70066e9d3503c5d2d4fd26a43c7dfa00f873)
+++ firmware/App/Modes/ModeWaterPreGen.h	(.../ModeWaterPreGen.h)	(revision 28b6e281605c1a944c982d0ec7dcdb6f28aac82b)
@@ -14,3 +14,39 @@
 * @date    (original)  03-Mar-2025
 *
 ***************************************************************************/
+
+#ifndef __MODE_WATER_PRE_GEN_H__
+#define __MODE_WATER_PRE_GEN_H__
+
+#include "ROCommon.h"
+#include "RODefs.h"
+
+/**
+ *  @defgroup FPPreGenWaterMode FPPreGenWaterMode
+ *  @brief Pre Generate Water unit. Manages pre checks water generation functions via a state machine.
+ *
+ *  @addtogroup FPPreGenWaterMode
+ *  @{
+ */
+
+// ********** public definitions **********
+
+/// Pre Generate water mode data structure
+typedef struct
+{
+    U32 preGenWExecState;                          ///< Pre Generate Water execution state
+} PRE_GENW_MODE_DATA_T;
+
+// ********** public function prototypes **********
+
+void initPreGenWMode( void );                               // Initialize this pre gen water mode unit
+U32  transitionToPreGenWMode( void );                       // Transition to pre gen water mode
+U32  execPreGenWMode( void );                               // Execute the pre gen water mode state machine (call from OperationModes)
+BOOL requestGenWaterStart( void );
+
+RO_PRE_GENW_MODE_STATE_T getCurrentPreGenWState( void );    // Get the current state of the pre gen water mode
+
+/**@}*/
+
+
+#endif