Use heater index defines

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

   }
 }
 
-FORCE_INLINE void _draw_heater_status(const int8_t heater, const char prefix, const bool blink) {
+FORCE_INLINE void _draw_heater_status(const heater_ind_t heater, const char prefix, const bool blink) {
   #if HAS_HEATED_BED
     const bool isBed = heater < 0;
     const float t1 = (isBed ? thermalManager.degBed()       : thermalManager.degHotend(heater)),
 }
 
 FORCE_INLINE void _draw_bed_status(const bool blink) {
-  _draw_heater_status(-1, (
+  _draw_heater_status(H_BED, (
     #if HAS_LEVELING
       planner.leveling_active && blink ? '_' :
     #endif
       //
       // Hotend 0 Temperature
       //
-      _draw_heater_status(0, -1, blink);
+      _draw_heater_status(H_E0, -1, blink);
 
       //
       // Hotend 1 or Bed Temperature
       //
       #if HOTENDS > 1
         lcd_moveto(8, 0);
-        lcd_put_wchar(LCD_STR_THERMOMETER[0]);
-        _draw_heater_status(1, -1, blink);
+        _draw_heater_status(H_E1, LCD_STR_THERMOMETER[0], blink);
       #elif HAS_HEATED_BED
         lcd_moveto(8, 0);
-        lcd_put_wchar(LCD_STR_BEDTEMP[0]);
-        _draw_heater_status(-1, -1, blink);
+        _draw_bed_status(blink);
       #endif
 
     #else // LCD_WIDTH >= 20
       //
       // Hotend 0 Temperature
       //
-      _draw_heater_status(0, LCD_STR_THERMOMETER[0], blink);
+      _draw_heater_status(H_E0, LCD_STR_THERMOMETER[0], blink);
 
       //
       // Hotend 1 or Bed Temperature
       //
       #if HOTENDS > 1
         lcd_moveto(10, 0);
-        _draw_heater_status(1, LCD_STR_THERMOMETER[0], blink);
+        _draw_heater_status(H_E1, LCD_STR_THERMOMETER[0], blink);
       #elif HAS_HEATED_BED
         lcd_moveto(10, 0);
         _draw_bed_status(blink);
         #if HOTENDS > 2 || (HOTENDS > 1 && HAS_HEATED_BED)
 
           #if HOTENDS > 2
-            _draw_heater_status(2, LCD_STR_THERMOMETER[0], blink);
+            _draw_heater_status(H_E2, LCD_STR_THERMOMETER[0], blink);
             lcd_moveto(10, 1);
           #endif
 
     //
     // Hotend 0 Temperature
     //
-    _draw_heater_status(0, LCD_STR_THERMOMETER[0], blink);
+    _draw_heater_status(H_E0, LCD_STR_THERMOMETER[0], blink);
 
     //
     // Z Coordinate
     //
     lcd_moveto(0, 1);
     #if HOTENDS > 1
-      _draw_heater_status(1, LCD_STR_THERMOMETER[0], blink);
+      _draw_heater_status(H_E1, LCD_STR_THERMOMETER[0], blink);
     #elif HAS_HEATED_BED
       _draw_bed_status(blink);
     #endif
     //
     lcd_moveto(0, 2);
     #if HOTENDS > 2
-      _draw_heater_status(2, LCD_STR_THERMOMETER[0], blink);
+      _draw_heater_status(H_E2, LCD_STR_THERMOMETER[0], blink);
     #elif HOTENDS > 1 && HAS_HEATED_BED
       _draw_bed_status(blink);
     #elif HAS_PRINT_PROGRESS
     void MarlinUI::draw_hotend_status(const uint8_t row, const uint8_t extruder) {
       if (row < LCD_HEIGHT) {
         lcd_moveto(LCD_WIDTH - 9, row);
-        _draw_heater_status(extruder, LCD_STR_THERMOMETER[0], get_blink());
+        _draw_heater_status((heater_ind_t)extruder, LCD_STR_THERMOMETER[0], get_blink());
       }
     }
 

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

   #define SHOW_ON_STATE false
 #endif
 
-FORCE_INLINE void _draw_heater_status(const int8_t heater, const bool blink) {
+FORCE_INLINE void _draw_heater_status(const heater_ind_t heater, const bool blink) {
   #if !HEATER_IDLE_HANDLER
     UNUSED(blink);
   #endif
   if (PAGE_UNDER(6 + 1 + 12 + 1 + 6 + 1)) {
     // Extruders
     for (uint8_t e = 0; e < MAX_HOTEND_DRAW; ++e)
-      _draw_heater_status(e, blink);
+      _draw_heater_status((heater_ind_t)e, blink);
 
     // Heated bed
     #if HAS_HEATED_BED && HOTENDS < 4
-      _draw_heater_status(-1, blink);
+      _draw_heater_status(H_BED, blink);
     #endif
 
     #if HAS_HEATED_CHAMBER