diff --git a/src/heatpumps/hp_dashboard.py b/src/heatpumps/hp_dashboard.py
index 8e4d9e6..7a36b01 100644
--- a/src/heatpumps/hp_dashboard.py
+++ b/src/heatpumps/hp_dashboard.py
@@ -246,18 +246,18 @@ def info_df(label, refrigs):
                 'Temperatur Vorlauf', min_value=0, max_value=T_crit,
                 value=params['C3']['T'], format='%d°C', key='T_consumer_ff'
             )
-            params['C0']['T'] = st.slider(
+            params['C1']['T'] = st.slider(
                 'Temperatur Rücklauf', min_value=0, max_value=T_crit,
-                value=params['C0']['T'], format='%d°C', key='T_consumer_bf'
+                value=params['C1']['T'], format='%d°C', key='T_consumer_bf'
             )
 
-            invalid_temp_diff = params['C0']['T'] >= params['C3']['T']
+            invalid_temp_diff = params['C1']['T'] >= params['C3']['T']
             if invalid_temp_diff:
                 st.error(
                     'Die Rücklauftemperatur muss niedriger sein, als die '
                     + 'Vorlauftemperatur.'
                 )
-            invalid_temp_diff = params['C0']['T'] <= params['B1']['T']
+            invalid_temp_diff = params['C1']['T'] <= params['B1']['T']
             if invalid_temp_diff:
                 st.error(
                     'Die Temperatur der Wärmesenke muss höher sein, als die '
diff --git a/src/heatpumps/models/HeatPumpCascade.py b/src/heatpumps/models/HeatPumpCascade.py
index 3330573..5561815 100644
--- a/src/heatpumps/models/HeatPumpCascade.py
+++ b/src/heatpumps/models/HeatPumpCascade.py
@@ -221,7 +221,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpCascade2IHX.py b/src/heatpumps/models/HeatPumpCascade2IHX.py
index 8718b43..6ae0534 100644
--- a/src/heatpumps/models/HeatPumpCascade2IHX.py
+++ b/src/heatpumps/models/HeatPumpCascade2IHX.py
@@ -257,7 +257,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpCascade2IHXTrans.py b/src/heatpumps/models/HeatPumpCascade2IHXTrans.py
index ef63d77..843b552 100644
--- a/src/heatpumps/models/HeatPumpCascade2IHXTrans.py
+++ b/src/heatpumps/models/HeatPumpCascade2IHXTrans.py
@@ -258,7 +258,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
         )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -517,7 +517,7 @@ def get_pressure_levels(self, T_mid):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             self.wf2
         ) * 1e-3
 
diff --git a/src/heatpumps/models/HeatPumpCascadeTrans.py b/src/heatpumps/models/HeatPumpCascadeTrans.py
index e86e423..d596f8e 100644
--- a/src/heatpumps/models/HeatPumpCascadeTrans.py
+++ b/src/heatpumps/models/HeatPumpCascadeTrans.py
@@ -224,7 +224,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -462,7 +462,7 @@ def get_pressure_levels(self, T_mid):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p']*1e5,
-            'T', self.params['C3']['T']+self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T']+self.params['trans']['ttd_l'] + 273.15,
             self.wf2
             ) * 1e-3
 
diff --git a/src/heatpumps/models/HeatPumpEcon.py b/src/heatpumps/models/HeatPumpEcon.py
index d39ea7a..5510017 100644
--- a/src/heatpumps/models/HeatPumpEcon.py
+++ b/src/heatpumps/models/HeatPumpEcon.py
@@ -223,7 +223,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpEconIHX.py b/src/heatpumps/models/HeatPumpEconIHX.py
index 4271a77..86567fd 100644
--- a/src/heatpumps/models/HeatPumpEconIHX.py
+++ b/src/heatpumps/models/HeatPumpEconIHX.py
@@ -270,7 +270,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpEconIHXTrans.py b/src/heatpumps/models/HeatPumpEconIHXTrans.py
index bddec85..7431658 100644
--- a/src/heatpumps/models/HeatPumpEconIHXTrans.py
+++ b/src/heatpumps/models/HeatPumpEconIHXTrans.py
@@ -270,7 +270,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -515,7 +515,7 @@ def get_pressure_levels(self, wf=None):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpEconTrans.py b/src/heatpumps/models/HeatPumpEconTrans.py
index 590bf32..a083a0b 100644
--- a/src/heatpumps/models/HeatPumpEconTrans.py
+++ b/src/heatpumps/models/HeatPumpEconTrans.py
@@ -226,7 +226,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
         )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -459,7 +459,7 @@ def get_pressure_levels(self, wf=None):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C3']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpFlash.py b/src/heatpumps/models/HeatPumpFlash.py
index bbeef6a..cc0c6b2 100644
--- a/src/heatpumps/models/HeatPumpFlash.py
+++ b/src/heatpumps/models/HeatPumpFlash.py
@@ -176,7 +176,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpFlashTrans.py b/src/heatpumps/models/HeatPumpFlashTrans.py
index 8a44ed9..3a3ba26 100644
--- a/src/heatpumps/models/HeatPumpFlashTrans.py
+++ b/src/heatpumps/models/HeatPumpFlashTrans.py
@@ -179,7 +179,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -405,7 +405,7 @@ def get_pressure_levels(self, wf=None):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpIC.py b/src/heatpumps/models/HeatPumpIC.py
index d31e7f0..a8247cb 100644
--- a/src/heatpumps/models/HeatPumpIC.py
+++ b/src/heatpumps/models/HeatPumpIC.py
@@ -177,7 +177,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpICTrans.py b/src/heatpumps/models/HeatPumpICTrans.py
index 31a7bd7..8a2cd91 100644
--- a/src/heatpumps/models/HeatPumpICTrans.py
+++ b/src/heatpumps/models/HeatPumpICTrans.py
@@ -179,7 +179,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -415,7 +415,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p']*1e5,
-            'T', self.params['C3']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
             ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpIHX.py b/src/heatpumps/models/HeatPumpIHX.py
index 300a2de..2c2010e 100644
--- a/src/heatpumps/models/HeatPumpIHX.py
+++ b/src/heatpumps/models/HeatPumpIHX.py
@@ -177,7 +177,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpIHXEcon.py b/src/heatpumps/models/HeatPumpIHXEcon.py
index 3ee4ff2..6067a62 100644
--- a/src/heatpumps/models/HeatPumpIHXEcon.py
+++ b/src/heatpumps/models/HeatPumpIHXEcon.py
@@ -242,7 +242,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpIHXEconTrans.py b/src/heatpumps/models/HeatPumpIHXEconTrans.py
index 93594e2..dcb1443 100644
--- a/src/heatpumps/models/HeatPumpIHXEconTrans.py
+++ b/src/heatpumps/models/HeatPumpIHXEconTrans.py
@@ -245,7 +245,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
         )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -490,7 +490,7 @@ def get_pressure_levels(self, wf=None):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpIHXPC.py b/src/heatpumps/models/HeatPumpIHXPC.py
index e695ec4..5565f4b 100644
--- a/src/heatpumps/models/HeatPumpIHXPC.py
+++ b/src/heatpumps/models/HeatPumpIHXPC.py
@@ -242,7 +242,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpIHXPCIHX.py b/src/heatpumps/models/HeatPumpIHXPCIHX.py
index f0f5c81..285f9b2 100644
--- a/src/heatpumps/models/HeatPumpIHXPCIHX.py
+++ b/src/heatpumps/models/HeatPumpIHXPCIHX.py
@@ -259,7 +259,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpIHXPCIHXTrans.py b/src/heatpumps/models/HeatPumpIHXPCIHXTrans.py
index 8a33abb..8151916 100644
--- a/src/heatpumps/models/HeatPumpIHXPCIHXTrans.py
+++ b/src/heatpumps/models/HeatPumpIHXPCIHXTrans.py
@@ -261,7 +261,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -514,7 +514,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpIHXPCTrans.py b/src/heatpumps/models/HeatPumpIHXPCTrans.py
index c625aa0..4e2ff6d 100644
--- a/src/heatpumps/models/HeatPumpIHXPCTrans.py
+++ b/src/heatpumps/models/HeatPumpIHXPCTrans.py
@@ -244,7 +244,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -488,7 +488,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpIHXTrans.py b/src/heatpumps/models/HeatPumpIHXTrans.py
index a4e5e7c..25d847c 100644
--- a/src/heatpumps/models/HeatPumpIHXTrans.py
+++ b/src/heatpumps/models/HeatPumpIHXTrans.py
@@ -178,7 +178,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -407,7 +407,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p']*1e5,
-            'T', self.params['C0']['T']+self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T']+self.params['trans']['ttd_l'] + 273.15,
             wf
             ) * 1e-3
 
diff --git a/src/heatpumps/models/HeatPumpPC.py b/src/heatpumps/models/HeatPumpPC.py
index b26aadc..eac8361 100644
--- a/src/heatpumps/models/HeatPumpPC.py
+++ b/src/heatpumps/models/HeatPumpPC.py
@@ -223,7 +223,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpPCIHX.py b/src/heatpumps/models/HeatPumpPCIHX.py
index 8180bc0..c3bb8b7 100644
--- a/src/heatpumps/models/HeatPumpPCIHX.py
+++ b/src/heatpumps/models/HeatPumpPCIHX.py
@@ -242,7 +242,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpPCIHXTrans.py b/src/heatpumps/models/HeatPumpPCIHXTrans.py
index a634cb1..685be1a 100644
--- a/src/heatpumps/models/HeatPumpPCIHXTrans.py
+++ b/src/heatpumps/models/HeatPumpPCIHXTrans.py
@@ -244,7 +244,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -488,7 +488,7 @@ def get_pressure_levels(self, wf=None):
         ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpPCTrans.py b/src/heatpumps/models/HeatPumpPCTrans.py
index f432186..0f025de 100644
--- a/src/heatpumps/models/HeatPumpPCTrans.py
+++ b/src/heatpumps/models/HeatPumpPCTrans.py
@@ -225,7 +225,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -459,7 +459,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p'] * 1e5,
-            'T', self.params['C0']['T'] + self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T'] + self.params['trans']['ttd_l'] + 273.15,
             wf
         ) * 1e-3
         p_mid = np.sqrt(p_evap * self.params['A0']['p'])
diff --git a/src/heatpumps/models/HeatPumpSimple.py b/src/heatpumps/models/HeatPumpSimple.py
index 9469cf3..34b3b0c 100644
--- a/src/heatpumps/models/HeatPumpSimple.py
+++ b/src/heatpumps/models/HeatPumpSimple.py
@@ -158,7 +158,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
diff --git a/src/heatpumps/models/HeatPumpSimpleTrans.py b/src/heatpumps/models/HeatPumpSimpleTrans.py
index 9420e66..cb8397a 100644
--- a/src/heatpumps/models/HeatPumpSimpleTrans.py
+++ b/src/heatpumps/models/HeatPumpSimpleTrans.py
@@ -159,7 +159,7 @@ def init_simulation(self, **kwargs):
             T=self.params['C3']['T'], p=self.params['C3']['p'],
             fluid={self.si: 1}
             )
-        self.conns['C0'].set_attr(T=self.params['C0']['T'])
+        self.conns['C1'].set_attr(T=self.params['C1']['T'])
 
         # Perform initial simulation and unset starting values
         self._solve_model(**kwargs)
@@ -376,7 +376,7 @@ def get_pressure_levels(self, wf=None):
             ) * 1e-5
         h_trans_out = PSI(
             'H', 'P', self.params['A0']['p']*1e5,
-            'T', self.params['C3']['T']+self.params['trans']['ttd_l'] + 273.15,
+            'T', self.params['C1']['T']+self.params['trans']['ttd_l'] + 273.15,
             wf
             ) * 1e-3
 
diff --git a/src/heatpumps/models/input/params_hp_cascade.json b/src/heatpumps/models/input/params_hp_cascade.json
index 88d5a4d..71df1aa 100644
--- a/src/heatpumps/models/input/params_hp_cascade.json
+++ b/src/heatpumps/models/input/params_hp_cascade.json
@@ -65,7 +65,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_cascade_2ihx.json b/src/heatpumps/models/input/params_hp_cascade_2ihx.json
index 819bc6d..97ef36d 100644
--- a/src/heatpumps/models/input/params_hp_cascade_2ihx.json
+++ b/src/heatpumps/models/input/params_hp_cascade_2ihx.json
@@ -75,7 +75,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_cascade_2ihx_trans.json b/src/heatpumps/models/input/params_hp_cascade_2ihx_trans.json
index 67b301f..bd40da2 100644
--- a/src/heatpumps/models/input/params_hp_cascade_2ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_cascade_2ihx_trans.json
@@ -78,7 +78,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 90
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_cascade_trans.json b/src/heatpumps/models/input/params_hp_cascade_trans.json
index 5170082..ec308fb 100644
--- a/src/heatpumps/models/input/params_hp_cascade_trans.json
+++ b/src/heatpumps/models/input/params_hp_cascade_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_closed.json b/src/heatpumps/models/input/params_hp_econ_closed.json
index 2a199fc..0d73078 100644
--- a/src/heatpumps/models/input/params_hp_econ_closed.json
+++ b/src/heatpumps/models/input/params_hp_econ_closed.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_closed_ihx.json b/src/heatpumps/models/input/params_hp_econ_closed_ihx.json
index 3cfae9f..be112fd 100644
--- a/src/heatpumps/models/input/params_hp_econ_closed_ihx.json
+++ b/src/heatpumps/models/input/params_hp_econ_closed_ihx.json
@@ -65,7 +65,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_closed_ihx_trans.json b/src/heatpumps/models/input/params_hp_econ_closed_ihx_trans.json
index 74d90d8..849647f 100644
--- a/src/heatpumps/models/input/params_hp_econ_closed_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_econ_closed_ihx_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_closed_trans.json b/src/heatpumps/models/input/params_hp_econ_closed_trans.json
index 22edbf4..122103a 100644
--- a/src/heatpumps/models/input/params_hp_econ_closed_trans.json
+++ b/src/heatpumps/models/input/params_hp_econ_closed_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_open.json b/src/heatpumps/models/input/params_hp_econ_open.json
index 8c2add7..b8b52c7 100644
--- a/src/heatpumps/models/input/params_hp_econ_open.json
+++ b/src/heatpumps/models/input/params_hp_econ_open.json
@@ -59,7 +59,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_open_ihx.json b/src/heatpumps/models/input/params_hp_econ_open_ihx.json
index 055e859..6de4b0d 100644
--- a/src/heatpumps/models/input/params_hp_econ_open_ihx.json
+++ b/src/heatpumps/models/input/params_hp_econ_open_ihx.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_open_ihx_trans.json b/src/heatpumps/models/input/params_hp_econ_open_ihx_trans.json
index b8ca51d..1ea14ed 100644
--- a/src/heatpumps/models/input/params_hp_econ_open_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_econ_open_ihx_trans.json
@@ -63,7 +63,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_econ_open_trans.json b/src/heatpumps/models/input/params_hp_econ_open_trans.json
index 2ec3bec..3b31f54 100644
--- a/src/heatpumps/models/input/params_hp_econ_open_trans.json
+++ b/src/heatpumps/models/input/params_hp_econ_open_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_flash.json b/src/heatpumps/models/input/params_hp_flash.json
index 27ee0a9..1eac74a 100644
--- a/src/heatpumps/models/input/params_hp_flash.json
+++ b/src/heatpumps/models/input/params_hp_flash.json
@@ -55,7 +55,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_flash_trans.json b/src/heatpumps/models/input/params_hp_flash_trans.json
index 56ba3da..3091eab 100644
--- a/src/heatpumps/models/input/params_hp_flash_trans.json
+++ b/src/heatpumps/models/input/params_hp_flash_trans.json
@@ -58,7 +58,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ic.json b/src/heatpumps/models/input/params_hp_ic.json
index dcba14a..d585f43 100644
--- a/src/heatpumps/models/input/params_hp_ic.json
+++ b/src/heatpumps/models/input/params_hp_ic.json
@@ -59,7 +59,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ic_trans.json b/src/heatpumps/models/input/params_hp_ic_trans.json
index cf3c6c8..d53ddb6 100644
--- a/src/heatpumps/models/input/params_hp_ic_trans.json
+++ b/src/heatpumps/models/input/params_hp_ic_trans.json
@@ -62,7 +62,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx.json b/src/heatpumps/models/input/params_hp_ihx.json
index a9411a3..dd1d049 100644
--- a/src/heatpumps/models/input/params_hp_ihx.json
+++ b/src/heatpumps/models/input/params_hp_ihx.json
@@ -57,7 +57,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_econ_closed.json b/src/heatpumps/models/input/params_hp_ihx_econ_closed.json
index 87415ff..104b9ac 100644
--- a/src/heatpumps/models/input/params_hp_ihx_econ_closed.json
+++ b/src/heatpumps/models/input/params_hp_ihx_econ_closed.json
@@ -65,7 +65,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_econ_closed_trans.json b/src/heatpumps/models/input/params_hp_ihx_econ_closed_trans.json
index 2b373f8..510b2fe 100644
--- a/src/heatpumps/models/input/params_hp_ihx_econ_closed_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_econ_closed_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_econ_open.json b/src/heatpumps/models/input/params_hp_ihx_econ_open.json
index 0c06660..180b770 100644
--- a/src/heatpumps/models/input/params_hp_ihx_econ_open.json
+++ b/src/heatpumps/models/input/params_hp_ihx_econ_open.json
@@ -64,7 +64,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_econ_open_trans.json b/src/heatpumps/models/input/params_hp_ihx_econ_open_trans.json
index 8b12fab..ff11082 100644
--- a/src/heatpumps/models/input/params_hp_ihx_econ_open_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_econ_open_trans.json
@@ -67,7 +67,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed.json
index 0d8475f..39b6c50 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed.json
@@ -65,7 +65,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx.json
index e78c375..76b4cb1 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx.json
@@ -70,7 +70,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx_trans.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx_trans.json
index 20d9589..4c1defb 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_ihx_trans.json
@@ -73,7 +73,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_trans.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_trans.json
index 1c08ce9..14fb7e8 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_closed_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open.json
index 22fa82e..5443515 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx.json
index 67e5783..45be6ad 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx.json
@@ -69,7 +69,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx_trans.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx_trans.json
index 822e7a2..7b05a1c 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_ihx_trans.json
@@ -72,7 +72,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 80
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_trans.json b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_trans.json
index 28c981f..bf43e68 100644
--- a/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_pc_econ_open_trans.json
@@ -63,7 +63,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_ihx_trans.json b/src/heatpumps/models/input/params_hp_ihx_trans.json
index da0f2f3..86e0bb8 100644
--- a/src/heatpumps/models/input/params_hp_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_ihx_trans.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_closed.json b/src/heatpumps/models/input/params_hp_pc_econ_closed.json
index aab4a9e..d54d9ca 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_closed.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_closed.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx.json b/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx.json
index 0d8475f..39b6c50 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx.json
@@ -65,7 +65,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx_trans.json b/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx_trans.json
index 785089a..c1a6356 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_closed_ihx_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_closed_trans.json b/src/heatpumps/models/input/params_hp_pc_econ_closed_trans.json
index 409712f..a5a32fa 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_closed_trans.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_closed_trans.json
@@ -63,7 +63,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 70
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_open.json b/src/heatpumps/models/input/params_hp_pc_econ_open.json
index 26307a0..0c1daf1 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_open.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_open.json
@@ -59,7 +59,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_open_ihx.json b/src/heatpumps/models/input/params_hp_pc_econ_open_ihx.json
index 22fa82e..5443515 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_open_ihx.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_open_ihx.json
@@ -60,7 +60,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_open_ihx_trans.json b/src/heatpumps/models/input/params_hp_pc_econ_open_ihx_trans.json
index 070e739..6571574 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_open_ihx_trans.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_open_ihx_trans.json
@@ -68,7 +68,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 60
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_pc_econ_open_trans.json b/src/heatpumps/models/input/params_hp_pc_econ_open_trans.json
index e4157df..5b9fe05 100644
--- a/src/heatpumps/models/input/params_hp_pc_econ_open_trans.json
+++ b/src/heatpumps/models/input/params_hp_pc_econ_open_trans.json
@@ -62,7 +62,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 70
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_simple.json b/src/heatpumps/models/input/params_hp_simple.json
index ca668bd..22aeb83 100644
--- a/src/heatpumps/models/input/params_hp_simple.json
+++ b/src/heatpumps/models/input/params_hp_simple.json
@@ -52,7 +52,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 50
     },
     "C3": {
diff --git a/src/heatpumps/models/input/params_hp_simple_trans.json b/src/heatpumps/models/input/params_hp_simple_trans.json
index cfbcb4a..349fc1a 100644
--- a/src/heatpumps/models/input/params_hp_simple_trans.json
+++ b/src/heatpumps/models/input/params_hp_simple_trans.json
@@ -55,7 +55,7 @@
     "B2": {
         "T": 5
     },
-    "C0": {
+    "C1": {
         "T": 40
     },
     "C3": {