diff --git a/brewpi.py b/brewpi.py
index 45886ce..2ca48f4 100644
--- a/brewpi.py
+++ b/brewpi.py
@@ -50,7 +50,7 @@ if __name__ == '__main__':
 	taskmgr.add(stirrer_task)
 
 	# Tracer
-	taskmgr.add(TracerTask(sensor, tc, DT_CTRL, dispatcher.msgio_get("Tracer")))
+	taskmgr.add(TracerTask(sensor, heater, tc, DT_CTRL, dispatcher.msgio_get("Tracer")))
 
 	# Message dispatcher
 	h_dispatcher = taskmgr.start()
diff --git a/results.m b/results.m
index 7b856f4..bfcbc49 100644
--- a/results.m
+++ b/results.m
@@ -25,12 +25,15 @@
 
 function retval = results()
 
-load test.mat
+load brewpi.mat
 set(0, "defaultlinelinewidth", 1.5);
-subplot(2,1,1)
+subplot(3,1,1)
 plot(time, tc_temp_soll, time, tc_temp_ist); grid
 legend("Temp_{soll}","Temp_{ist}")
-subplot(2,1,2)
+subplot(3,1,2)
 plot(time, tc_dtemp_soll, time, tc_dtemp_ist, time, tc_dtemp_commanded); grid
 legend("dTemp_{soll}","dTemp_{ist}","dTemp_{cmd}")
+subplot(3,1,3)
+plot(time, heater_power); grid
+legend("Power_{Heater}")
 endfunction
diff --git a/tasks/tracer.py b/tasks/tracer.py
index 6b289ef..b8e3aa5 100644
--- a/tasks/tracer.py
+++ b/tasks/tracer.py
@@ -1,7 +1,9 @@
+import time
 import asyncio
 from tasks import ATask
 from ws.message import MsgIo
 from components import ATemperatureSensor
+from components import AHeater
 from components.pid import TempController
 
 import numpy as np
@@ -9,13 +11,14 @@ import scipy.io
 
 
 class TracerTask(ATask):
-	def __init__(self, sensor: ATemperatureSensor, temp_ctrl: TempController, interval, msg_handler: MsgIo):
+	def __init__(self, sensor: ATemperatureSensor, heater: AHeater, temp_ctrl: TempController, interval, msg_handler: MsgIo):
 		ATask.__init__(self, interval)
 
 		self.msg_handler = msg_handler
 		msg_handler.set_recv_handler(self.recv)
 
 		self.sensor = sensor
+		self.heater = heater
 		self.temp_ctrl = temp_ctrl
 
 	async def recv(self, data):
@@ -27,25 +30,32 @@ class TracerTask(ATask):
 	async def on_process(self):
 		print("{}: Started with interval {} s".format(self.msg_handler.get_key(), self.interval))
 
-		time = 0
-		_time = np.empty(0)
+		timestamp = 0
+		_timestamp = np.empty(0)
 		_sensor_temp = np.empty(0)
+		_heater_power = np.empty(0)
 		_tc_temp_ist = np.empty(0)
 		_tc_dtemp_ist = np.empty(0)
 		_tc_temp_soll = np.empty(0)
 		_tc_dtemp_soll = np.empty(0)
 		_tc_dtemp_commanded = np.empty(0)
 
+		filename = "brewpi." + time.strftime("%Y%m%d%H%M%S", time.localtime()) + ".mat"
 		while True:
-			_time = np.append(_time, time)
+			_timestamp = np.append(_timestamp, timestamp)
 			_sensor_temp = np.append(_sensor_temp, self.sensor.temperature())
+			_heater_power = np.append(_heater_power, self.heater.get_power())
 			_tc_temp_ist = np.append(_tc_temp_ist, self.temp_ctrl.theta_ist)
-			_tc_dtemp_ist = np.append(_tc_dtemp_ist, self.temp_ctrl.heatrate_ist)
+			_tc_dtemp_ist = np.append(_tc_dtemp_ist, max(-1, self.temp_ctrl.heatrate_ist))
 			_tc_temp_soll = np.append(_tc_temp_soll, self.temp_ctrl.theta_soll_set)
 			_tc_dtemp_soll = np.append(_tc_dtemp_soll, self.temp_ctrl.heatrate_soll_set)
 			_tc_dtemp_commanded = np.append(_tc_dtemp_commanded, self.temp_ctrl.heatrate_soll)
-			scipy.io.savemat('test.mat', {'time': _time, 'sensor_temp': _sensor_temp, 'tc_temp_ist': _tc_temp_ist, 'tc_dtemp_ist': _tc_dtemp_ist, 'tc_temp_soll': _tc_temp_soll, 'tc_dtemp_soll': _tc_dtemp_soll, 'tc_dtemp_commanded': _tc_dtemp_commanded})
-			time += 1
+
+			data = {'time': _timestamp, 'sensor_temp': _sensor_temp, 'heater_power': _heater_power, 'tc_temp_ist': _tc_temp_ist, 'tc_dtemp_ist': _tc_dtemp_ist, 'tc_temp_soll': _tc_temp_soll, 'tc_dtemp_soll': _tc_dtemp_soll, 'tc_dtemp_commanded': _tc_dtemp_commanded}
+
+			scipy.io.savemat('brewpi.mat', data)
+			scipy.io.savemat(filename, data)
+			timestamp += 1
 			await asyncio.sleep(self.interval)