diff --git a/brewpi.py b/brewpi.py
index 92b73b3..4333217 100644
--- a/brewpi.py
+++ b/brewpi.py
@@ -69,7 +69,7 @@ class HeaterTask(ATask):
 			self.heater.process()
 			power.set(round(self.heater.getPower()))
 			if power.is_changed():
-				await self.send({'Power': power.get()})
+				await self.send({'Power': power.get(), 'Activate': int(self.heater.getPower() != 0)})
 			await asyncio.sleep(self.interval)
 
 
diff --git a/brewpi.ui b/brewpi.ui
index 3c661c4..10c23bb 100644
--- a/brewpi.ui
+++ b/brewpi.ui
@@ -1925,30 +1925,56 @@
      </rect>
     </property>
    </widget>
-   <widget class="QwtSlider" name="Slider">
+   <widget class="QGroupBox" name="groupBox">
     <property name="geometry">
      <rect>
-      <x>430</x>
-      <y>90</y>
-      <width>91</width>
-      <height>381</height>
+      <x>410</x>
+      <y>30</y>
+      <width>261</width>
+      <height>441</height>
      </rect>
     </property>
-    <property name="lowerBound">
-     <double>0.000000000000000</double>
-    </property>
-    <property name="upperBound">
-     <double>100.000000000000000</double>
-    </property>
-    <property name="scaleMaxMajor">
-     <number>7</number>
-    </property>
-    <property name="scaleMaxMinor">
-     <number>3</number>
-    </property>
-    <property name="scaleStepSize">
-     <double>0.000000000000000</double>
+    <property name="title">
+     <string>Heater</string>
     </property>
+    <widget class="QCheckBox" name="checkbox_heater_activate">
+     <property name="geometry">
+      <rect>
+       <x>140</x>
+       <y>390</y>
+       <width>92</width>
+       <height>23</height>
+      </rect>
+     </property>
+     <property name="text">
+      <string>Activate</string>
+     </property>
+    </widget>
+    <widget class="QwtSlider" name="Slider">
+     <property name="geometry">
+      <rect>
+       <x>10</x>
+       <y>40</y>
+       <width>91</width>
+       <height>381</height>
+      </rect>
+     </property>
+     <property name="lowerBound">
+      <double>0.000000000000000</double>
+     </property>
+     <property name="upperBound">
+      <double>100.000000000000000</double>
+     </property>
+     <property name="scaleMaxMajor">
+      <number>7</number>
+     </property>
+     <property name="scaleMaxMinor">
+      <number>3</number>
+     </property>
+     <property name="scaleStepSize">
+      <double>0.000000000000000</double>
+     </property>
+    </widget>
    </widget>
   </widget>
   <widget class="QMenuBar" name="menubar">
diff --git a/brewpi_gui.py b/brewpi_gui.py
index bca966b..c774ce1 100644
--- a/brewpi_gui.py
+++ b/brewpi_gui.py
@@ -29,12 +29,9 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		self.actionStart.triggered.connect(self.connect)
 		self.actionStop.triggered.connect(self.disconnect)
 		self.Slider.valueChanged.connect(self.on_slider_changed)
+		self.checkbox_heater_activate.stateChanged.connect(self.on_checkbox_changed)
 		self.send_data = Queue()
 
-		# Initially enqueue GUI setter
-		# Slider
-		self.msg_heater.send_from_thread({'Activate': 1, 'Power': self.Slider.value()})
-
 	def connect(self):
 		self.ws_client.connect(uri="ws://localhost:8765")
 
@@ -43,7 +40,11 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 
 	def on_slider_changed(self, value):
 		print("on_slider_changed {}".format(value))
-		self.msg_heater.send_from_thread({'Activate': 1, 'Power': value})
+		self.msg_heater.send_from_thread({'Power': value})
+
+	def on_checkbox_changed(self, value):
+		print("on_checkbox_changed {}".format(value))
+		self.msg_heater.send_from_thread({'Activate': int(value == 2)})
 
 	async def on_pot_changed(self, msg):
 		print("on_pot_changed {}".format(msg))
@@ -58,8 +59,11 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 	async def on_heater_changed(self, msg):
 		print("on_heater_changed {}".format(msg))
 		for key in msg:
-			if "Power" in key:
+			if "Activate" in key:
+				self.checkbox_heater_activate.setCheckState(2 if msg['Activate'] == 1 else 0)
+			elif "Power" in key:
 				self.lcdNumber.display(msg['Power'])
+				self.Slider.setValue(msg['Power'])
 			elif "Capabilities" in key:
 				submsg = msg['Capabilities']
 				if "Power" in submsg:
diff --git a/brewpi_win.py b/brewpi_win.py
index 0dfb627..294769e 100644
--- a/brewpi_win.py
+++ b/brewpi_win.py
@@ -658,8 +658,14 @@ class Ui_MainWindow(object):
         self.Thermo = QwtThermo(self.centralwidget)
         self.Thermo.setGeometry(QtCore.QRect(890, 50, 56, 201))
         self.Thermo.setObjectName("Thermo")
-        self.Slider = QwtSlider(self.centralwidget)
-        self.Slider.setGeometry(QtCore.QRect(430, 90, 91, 381))
+        self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
+        self.groupBox.setGeometry(QtCore.QRect(410, 30, 261, 441))
+        self.groupBox.setObjectName("groupBox")
+        self.checkbox_heater_activate = QtWidgets.QCheckBox(self.groupBox)
+        self.checkbox_heater_activate.setGeometry(QtCore.QRect(140, 390, 92, 23))
+        self.checkbox_heater_activate.setObjectName("checkbox_heater_activate")
+        self.Slider = QwtSlider(self.groupBox)
+        self.Slider.setGeometry(QtCore.QRect(10, 40, 91, 381))
         self.Slider.setLowerBound(0.0)
         self.Slider.setUpperBound(100.0)
         self.Slider.setScaleMaxMajor(7)
@@ -702,6 +708,8 @@ class Ui_MainWindow(object):
         MainWindow.setWindowTitle(_translate("MainWindow", "BrewPi"))
         self.horizontalTabWidget.setTabText(self.horizontalTabWidget.indexOf(self.tab), _translate("MainWindow", "Seite"))
         self.horizontalTabWidget.setTabText(self.horizontalTabWidget.indexOf(self.tab_2), _translate("MainWindow", "Seite"))
+        self.groupBox.setTitle(_translate("MainWindow", "Heater"))
+        self.checkbox_heater_activate.setText(_translate("MainWindow", "Activate"))
         self.menu_File.setTitle(_translate("MainWindow", "&File"))
         self.menu_Help.setTitle(_translate("MainWindow", "&Help"))
         self.toolBar.setWindowTitle(_translate("MainWindow", "toolBar"))