diff --git a/Control/brewpi/plant.py b/Control/brewpi/plant.py
index 78da918..bffcf8a 100644
--- a/Control/brewpi/plant.py
+++ b/Control/brewpi/plant.py
@@ -10,6 +10,7 @@ class Plant(APlant):
 		self.heater = HendiCtrl('/dev/ttyUSB0', 115200)
 		self.tempsensor = Max31865()
 		self.P = 0
+		self.isOn = False
 
 	def activate(self, enable):
 		if enable:
@@ -25,6 +26,14 @@ class Plant(APlant):
 	def setPower(self, power_w):
 		self.P = power_w
 		self.heater.setPowerWatts(power_w)
+		if power_w < 250:
+			if self.isOn:
+				self.heater.setSwitch(False)
+				self.isOn = False
+		elif power_w >= 500:
+			if not self.isOn:
+				self.heater.setSwitch(True)
+				self.isOn = True
 
 	def getPower(self):
 		return self.heater.getPowerWatts()