diff --git a/Boiler_2_Stufig_Mit_Fueler/form.json b/Boiler_2_Stufig_Mit_Fueler/form.json
index 7b61f49..d6bd2a4 100644
--- a/Boiler_2_Stufig_Mit_Fueler/form.json
+++ b/Boiler_2_Stufig_Mit_Fueler/form.json
@@ -19,6 +19,12 @@
                }
             ]
          },
+         {
+            "type": "NumberSpinner",
+            "name": "ZeitKonstante",
+            "caption": "Zeit Konstante",
+            "suffix": ""
+        },
         {
             "type": "NumberSpinner",
             "name": "IdleCounterMax",
diff --git a/Boiler_2_Stufig_Mit_Fueler/module.php b/Boiler_2_Stufig_Mit_Fueler/module.php
index f5a50e0..cf08493 100644
--- a/Boiler_2_Stufig_Mit_Fueler/module.php
+++ b/Boiler_2_Stufig_Mit_Fueler/module.php
@@ -9,6 +9,7 @@ class Boiler_2_Stufig_Mit_Fueler extends IPSModule
         // Boiler spezifische Properties
         $this->RegisterPropertyInteger("BoilerLeistungTeillast", 3000);
         $this->RegisterPropertyInteger("BoilerLeistungVolllast", 6000);
+        $this->RegisterPropertyInteger("ZeitKonstante", 120);
         $this->RegisterPropertyInteger("Boilerfuehler_PT1", 0);
         $this->RegisterPropertyInteger("Kontakt_Teillast", 0);
         $this->RegisterPropertyInteger("Kontakt_Volllast", 0);
@@ -51,7 +52,7 @@ class Boiler_2_Stufig_Mit_Fueler extends IPSModule
 
     public function RequestAction($Ident, $Value)
     {
-        IPS_LogMessage("Boiler Debug", "RequestAction triggered: $Ident = $Value");
+        
     
         switch ($Ident) {
 
@@ -130,7 +131,7 @@ class Boiler_2_Stufig_Mit_Fueler extends IPSModule
             }
         
             // PT
-            $time_constant = 120; // Zeitkonstante in Sekunden (1 Minute)
+            $time_constant= $this->ReadPropertyInteger("ZeitKonstante");
             $delta_t = 30; // Zeitdifferenz zwischen den Messungen (30 Sekunden)
             $alpha = $delta_t / ($time_constant + $delta_t);
             $newBoilerTemp = $boilerTemp + $alpha * ($boilerPT1 - $boilerTemp);
diff --git a/library.json b/library.json
index b30908b..3d8a4c1 100644
--- a/library.json
+++ b/library.json
@@ -6,7 +6,7 @@
     "compatibility": {
         "version": "7.1"
     },
-    "version": "0.267",
+    "version": "0.268",
 
     "build": 0,
     "date": 0