diff --git a/VECTO3GUI2020/Properties/Strings.Designer.cs b/VECTO3GUI2020/Properties/Strings.Designer.cs
index af84e5633a9257dd60f50d7ca04b2e824027375b..f6ed81b6119d8487f88808a75d73483276c44400 100644
--- a/VECTO3GUI2020/Properties/Strings.Designer.cs
+++ b/VECTO3GUI2020/Properties/Strings.Designer.cs
@@ -276,6 +276,15 @@ namespace VECTO3GUI2020.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Heat Pump Mode.
+        /// </summary>
+        public static string HeatPumpMode {
+            get {
+                return ResourceManager.GetString("HeatPumpMode", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Heat Pump Mode Driver.
         /// </summary>
@@ -294,6 +303,15 @@ namespace VECTO3GUI2020.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Heat Pump Type.
+        /// </summary>
+        public static string HeatPumpType {
+            get {
+                return ResourceManager.GetString("HeatPumpType", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Heat Pump Type Driver.
         /// </summary>
diff --git a/VECTO3GUI2020/Properties/Strings.resx b/VECTO3GUI2020/Properties/Strings.resx
index 7b1d0f376e31a205e44482cad77e26d36b669a5a..25e87f6f23c6530b2a2868dbffec73b6cbcd8cc4 100644
--- a/VECTO3GUI2020/Properties/Strings.resx
+++ b/VECTO3GUI2020/Properties/Strings.resx
@@ -319,4 +319,10 @@
   <data name="TransferredAirDragArea" xml:space="preserve">
     <value>Transferred Airdrag Area</value>
   </data>
+  <data name="HeatPumpMode" xml:space="preserve">
+    <value>Heat Pump Mode</value>
+  </data>
+  <data name="HeatPumpType" xml:space="preserve">
+    <value>Heat Pump Type</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/VECTO3GUI2020/Util/XML/Implementation/ComponentWriter/XMLBusAuxiliariesWriter.cs b/VECTO3GUI2020/Util/XML/Implementation/ComponentWriter/XMLBusAuxiliariesWriter.cs
index a5df8e7c217ca6ad96ca11d4a8380f29484aca0a..ad44783039c8b070b744ed533de5947710fd64bb 100644
--- a/VECTO3GUI2020/Util/XML/Implementation/ComponentWriter/XMLBusAuxiliariesWriter.cs
+++ b/VECTO3GUI2020/Util/XML/Implementation/ComponentWriter/XMLBusAuxiliariesWriter.cs
@@ -85,7 +85,11 @@ namespace VECTO3GUI2020.Util.XML.Implementation.ComponentWriter
 			if (_inputData.HVACAux != null) {
 				var hvacElement = new XElement(_defaultNamespace + "HVAC");
 				hvacElement.Add(new XElement(_defaultNamespace + XMLNames.Bus_SystemConfiguration, _inputData.HVACAux.SystemConfiguration.GetXmlFormat()));
-				hvacElement.Add(new XElement(_defaultNamespace + XMLNames.Bus_HeatPumpTypeDriver, _inputData.HVACAux.HeatPumpTypeDriverCompartment.GetLabel()));
+				var heatPumpTypeLabel = _inputData.HVACAux.HeatPumpTypeDriverCompartment.GetLabel();
+				if (heatPumpTypeLabel == "~null~") {
+					heatPumpTypeLabel = null;
+				}
+				hvacElement.Add(new XElement(_defaultNamespace + XMLNames.Bus_HeatPumpTypeDriver, heatPumpTypeLabel));
 				hvacElement.Add(new XElement(_defaultNamespace + XMLNames.Bus_HeatPumpModeDriver, _inputData.HVACAux.HeatPumpModeDriverCompartment.GetLabel()));
 				//TODO
 				if (_inputData.HVACAux.HeatPumpPassengerCompartments != null) {
diff --git a/VECTO3GUI2020/ViewModel/MultiStage/Implementation/MultistageAuxiliariesViewModel.cs b/VECTO3GUI2020/ViewModel/MultiStage/Implementation/MultistageAuxiliariesViewModel.cs
index e431ae06740b63fcada94ecf0f2e135a53ba1bee..6bc132b840303d36db92cae06d51ea6ce37f600e 100644
--- a/VECTO3GUI2020/ViewModel/MultiStage/Implementation/MultistageAuxiliariesViewModel.cs
+++ b/VECTO3GUI2020/ViewModel/MultiStage/Implementation/MultistageAuxiliariesViewModel.cs
@@ -47,7 +47,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 		{
 			ConsolidatedInputData = consolidatedAuxiliariesInputData;
 			if (ConsolidatedInputData?.HVACAux?.HeatPumpPassengerCompartments != null) {
-				ConsolidatedHeatPumpConfigurationsPassenger = new ObservableCollection<HeatPumpConfiguration>();
+				_consolidatedHeatPumpConfigurationsPassenger = new ObservableCollection<HeatPumpConfiguration>();
 				foreach (var (heatPumpType, heatPumpMode) in ConsolidatedInputData?.HVACAux?.HeatPumpPassengerCompartments) {
 					ConsolidatedHeatPumpConfigurationsPassenger.Add(new HeatPumpConfiguration()
 					{
@@ -361,7 +361,13 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 		public ICommand AddPassengerHeatpumpCommand
 		{
 			get => _addPassengerHeatpumpCommand ??
-					new RelayCommand(() => HeatPumpConfigurationsPassenger.Add(new HeatPumpConfiguration()),
+					new RelayCommand(() => {
+							HeatPumpGroupEditingEnabled = true;
+							if (HeatPumpConfigurationsPassenger == null) {
+								HeatPumpConfigurationsPassenger = new ObservableCollection<HeatPumpConfiguration>();
+							}
+							HeatPumpConfigurationsPassenger.Add(new HeatPumpConfiguration());
+						},
 						() => true);
 		}
 
@@ -370,7 +376,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 		public ICommand RemovePassengerHeatpumpCommand
 		{
 			get => _removePasssengerHeatpumpCommand ??
-					new RelayCommand<HeatPumpConfiguration>(hp => HeatPumpConfigurationsPassenger.Remove(hp), (hp) => true);
+					new RelayCommand<HeatPumpConfiguration>(hp => HeatPumpConfigurationsPassenger?.Remove(hp), (hp) => true);
 		}
 
 		public IList<Tuple<HeatPumpType, HeatPumpMode>> HeatPumpPassengerCompartments{
@@ -383,11 +389,19 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 				return list;
 			}
 		}
-		public ObservableCollection<HeatPumpConfiguration> ConsolidatedHeatPumpConfigurationsPassenger { get; }
 
+		public ObservableCollection<HeatPumpConfiguration> ConsolidatedHeatPumpConfigurationsPassenger
+		{
+			get => _consolidatedHeatPumpConfigurationsPassenger;
+			private set => SetProperty(ref _consolidatedHeatPumpConfigurationsPassenger, value);
+		}
 
-		public ObservableCollection<HeatPumpConfiguration> HeatPumpConfigurationsPassenger { get; } =
-			new ObservableCollection<HeatPumpConfiguration>();
+
+		public ObservableCollection<HeatPumpConfiguration> HeatPumpConfigurationsPassenger
+		{
+			get => _heatPumpConfigurationsPassenger;
+			private set => SetProperty(ref _heatPumpConfigurationsPassenger, value);
+		}
 
 		public class HeatPumpConfiguration : ViewModelBase, ITuple, IDataErrorInfo
 		{
@@ -505,6 +519,9 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 					_parameterViewModels[nameof(HeatPumpModeDriverCompartment)].EditingEnabled = value;
 					_parameterViewModels[nameof(HeatPumpTypeDriverCompartment)].EditingEnabled = value;
 					_parameterViewModels[nameof(SystemConfiguration)].EditingEnabled = value;
+					if (value == false) {
+						HeatPumpConfigurationsPassenger = null;
+					}
 				}
 			}
 		}
@@ -635,6 +652,8 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 
 		private CompressorDrive _compressorDrive;
 		private Dictionary<string, MultistageParameterViewModel> _parameterViewModels;
+		private ObservableCollection<HeatPumpConfiguration> _consolidatedHeatPumpConfigurationsPassenger;
+		private ObservableCollection<HeatPumpConfiguration> _heatPumpConfigurationsPassenger;
 
 
 		public CompressorDrive CompressorDrive
diff --git a/VECTO3GUI2020/Views/Multistage/ManufacturingStageAuxiliariesView.xaml b/VECTO3GUI2020/Views/Multistage/ManufacturingStageAuxiliariesView.xaml
index 637a42d957cab6525a0b0024815c124c260b694b..d7be002ca96dedebe96aeebacd63cf47de27fb1e 100644
--- a/VECTO3GUI2020/Views/Multistage/ManufacturingStageAuxiliariesView.xaml
+++ b/VECTO3GUI2020/Views/Multistage/ManufacturingStageAuxiliariesView.xaml
@@ -8,7 +8,7 @@
              xmlns:impl="clr-namespace:VECTO3GUI2020.ViewModel.MultiStage.Implementation"
              xmlns:properties="clr-namespace:VECTO3GUI2020.Properties"
              mc:Ignorable="d" 
-             d:DesignHeight="450" d:DesignWidth="800" BorderBrush="{DynamicResource ButtonHighlightColor}" BorderThickness="2" Margin="4"
+             d:DesignHeight="450" d:DesignWidth="800" BorderBrush="{DynamicResource ButtonHighlightColor}" BorderThickness="3" Margin="4"
              d:DataContext="{d:DesignInstance impl:MultistageAuxiliariesViewModel}">
     <UserControl.Resources>
         <Style TargetType="customControls:MultiStageParameter">
@@ -32,62 +32,67 @@
                     <ContentControl Content="{Binding ParameterViewModels[PositionlightsLED]}"/>
                     <ContentControl Content="{Binding ParameterViewModels[BrakelightsLED]}"/>
                     <ContentControl Content="{Binding ParameterViewModels[HeadlightsLED]}"/>
-
+                    
 
                     <Label  Style="{DynamicResource LabelStyle1}">Heating, Ventilation and Air Conditioning</Label>
                     <ContentControl Content="{Binding ParameterViewModels[SystemConfiguration]}"/>
                     <ContentControl Content="{Binding ParameterViewModels[HeatPumpTypeDriverCompartment]}"/>
                     <ContentControl Content="{Binding ParameterViewModels[HeatPumpModeDriverCompartment]}"/>
-                    <Label Padding="10 4 0 4" Style="{DynamicResource LabelStyle1}">Consolidated Data</Label>
-                    <ItemsControl 
+                    <Border Margin="5 0" BorderBrush="{DynamicResource ButtonHighlightColor}" BorderThickness="2" >
+                        <StackPanel Margin="0">
+                            <Label Margin="0" Style="{DynamicResource LabelStyle1}">Heat Pumps Passenger Compartment</Label>
+                            <Label Padding="10 4 0 4" Style="{DynamicResource LabelStyle1}">Consolidated Data</Label>
+                            <ItemsControl 
                         Visibility="{Binding ConsolidatedHeatPumpConfigurationsPassenger, Converter={StaticResource NullToVisibilityConverter}}" 
                         ItemsSource="{Binding ConsolidatedHeatPumpConfigurationsPassenger}" 
                         HorizontalContentAlignment="Stretch"
                         Padding="5 5 29 5 " >
-                        <ItemsControl.ItemTemplate>
-                            <DataTemplate>
-                                <Border BorderThickness="1">
-                                    <DockPanel LastChildFill="true">
-                                        <UniformGrid DockPanel.Dock="Left" Columns="2">
-                                            <ContentControl Grid.Column="0" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpTypeVM}"/>
-                                            <ContentControl Grid.Column="1" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpModeVM}"/>
-                                        </UniformGrid>
-                                    </DockPanel>
-                                </Border>
-                            </DataTemplate>
-                        </ItemsControl.ItemTemplate>
-                    </ItemsControl>
-                    <Label Visibility="{Binding ConsolidatedHeatPumpConfigurationsPassenger, 
+                                <ItemsControl.ItemTemplate>
+                                    <DataTemplate>
+                                        <Border BorderThickness="1">
+                                            <DockPanel LastChildFill="true">
+                                                <UniformGrid DockPanel.Dock="Left" Columns="2">
+                                                    <ContentControl Grid.Column="0" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpTypeVM}"/>
+                                                    <ContentControl Grid.Column="1" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpModeVM}"/>
+                                                </UniformGrid>
+                                            </DockPanel>
+                                        </Border>
+                                    </DataTemplate>
+                                </ItemsControl.ItemTemplate>
+                            </ItemsControl>
+                            <Label Visibility="{Binding ConsolidatedHeatPumpConfigurationsPassenger, 
                         Converter={StaticResource NullToVisibilityConverter}, 
                         ConverterParameter=invert}"
-                           HorizontalAlignment="Center"> No consolidated data available </Label>
-                    <DockPanel LastChildFill="true">
-                        <Button DockPanel.Dock="right"  ContentTemplate="{DynamicResource AddIcon}" Command="{Binding AddPassengerHeatpumpCommand}">
+                           HorizontalAlignment="Center">No consolidated data available</Label>
+                            <DockPanel LastChildFill="true">
+                                <Button DockPanel.Dock="right"  ContentTemplate="{DynamicResource AddIcon}" Command="{Binding AddPassengerHeatpumpCommand}">
 
-                        </Button>
-                        <Label Style="{DynamicResource LabelStyle1}" Padding="10 4 0 4">Current Stage</Label>
-                    </DockPanel>
-                    
-                    <ItemsControl ItemsSource="{Binding HeatPumpConfigurationsPassenger}" HorizontalContentAlignment="Stretch"
+                                </Button>
+                                <Label Style="{DynamicResource LabelStyle1}" Padding="10 4 0 4">Current Stage</Label>
+                            </DockPanel>
+
+                            <ItemsControl ItemsSource="{Binding HeatPumpConfigurationsPassenger}" HorizontalContentAlignment="Stretch"
                                   Padding="5">
-                        <ItemsControl.ItemTemplate>
-                            <DataTemplate>
-                                <Border BorderThickness="1">
-                                    <DockPanel LastChildFill="true">
-                                        <Button DockPanel.Dock="Right" Height="24"
+                                <ItemsControl.ItemTemplate>
+                                    <DataTemplate>
+                                        <Border BorderThickness="1">
+                                            <DockPanel LastChildFill="true">
+                                                <Button DockPanel.Dock="Right" Height="24"
                                                 ContentTemplate="{DynamicResource TrashIcon}"
                                                 Command="{Binding RelativeSource={RelativeSource AncestorType=ItemsControl}, 
                                                             Path=DataContext.RemovePassengerHeatpumpCommand}"
                                                 CommandParameter="{Binding }"/>
-                                        <UniformGrid DockPanel.Dock="Left" Columns="2">
-                                            <ContentControl Grid.Column="0" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpTypeVM}"/>
-                                            <ContentControl Grid.Column="1" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpModeVM}"/>
-                                        </UniformGrid>
-                                    </DockPanel>
-                                </Border>
-                            </DataTemplate>
-                        </ItemsControl.ItemTemplate>
-                    </ItemsControl>
+                                                <UniformGrid DockPanel.Dock="Left" Columns="2">
+                                                    <ContentControl Grid.Column="0" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpTypeVM}"/>
+                                                    <ContentControl Grid.Column="1" DockPanel.Dock="Top" Content="{Binding Path=HeatPumpModeVM}"/>
+                                                </UniformGrid>
+                                            </DockPanel>
+                                        </Border>
+                                    </DataTemplate>
+                                </ItemsControl.ItemTemplate>
+                            </ItemsControl>
+                        </StackPanel>
+                    </Border>
 
 
                     <ContentControl Content="{Binding ParameterViewModels[AuxHeaterPower]}"/>
diff --git a/Vecto3GUI2020Test/ViewModelTests/VehicleViewModelTests.cs b/Vecto3GUI2020Test/ViewModelTests/VehicleViewModelTests.cs
index 82b1b47ac4a9851ea8d0ef9f34cdc97d9d468144..e46e68650e4670b5a084f24f4e42787e0d9db976 100644
--- a/Vecto3GUI2020Test/ViewModelTests/VehicleViewModelTests.cs
+++ b/Vecto3GUI2020Test/ViewModelTests/VehicleViewModelTests.cs
@@ -72,6 +72,9 @@ namespace Vecto3GUI2020Test.ViewModelTests
 			var vehicleVM =
 				vm.MultiStageJobViewModel.ManufacturingStageViewModel.Vehicle as
 					DeclarationInterimStageBusVehicleViewModel_v2_8;
+
+			
+
 		}
 		/// <summary>
 		/// airdrag component is in VIF set => AirdragModifiedMultistage is mandatory