KT3009 socket thermostat with a temperature sensor on the cable.

A similar thermostat to the KT3100, also from the Chinese manufacturer Ketotek.  I tested about six pieces and have good experience which I will describe reviews with pros and cons, detailed instructions  how to set menu for timer and heating cooling .

Price and buy

Temperature controller can buy from Ebay or AliExpress, good price varies around about 12 usd shipping included.

My review:

The Chinese AC wall plug thermostat of course has a good price, standard good design.The design is socket o cablethis distinguishes the KT3009 from the KT3100 which is directly into the socket

Probably the biggest difference is Is the timer missing KT3100 proves to work in timer mode.Another difference is the KT3009 display has blue LED digits, this can be an advantage because it can be seen in the dark, but it can also interfere.

The advantage can be that it is connected to the socket via a cable, the thermostat itself is on the cable, it can be better placed near your device.

Wide Range of Application: This temperature controlled outlet plug is widely used for greenhouse, reptile, incubator, terrarium, freezer, refrigerator, heater, fridge, homebrew, vivarium, fermentation, heat mat, and other temperature-controlled system.

If you want hygrostat version for humidity controll check XK-W2008 humidity controller.

Here is pros:

  • Good price about 12usd
  • The device is reliable and well made
  • You can place the temperature sensor on the cable where it is needed
  • Simple kontroll

Here is cons:

  • Without timer
  • The light from the displays can be distracting


It’s norma piece for the money,you have a wall thermostat.When buying, pay attention to the correct choice of socket, EU, FR, US, UK, AU are available.Maybe you don’t need to buy KT3009 from Ketotek you can buy OEM outlet thermostat on aliexpress I think they are the same.

KT3009 termperature controller manual

KT3009 temperature controller. Here is a step-by-step guide:

Introduction: The KT3009 temperature controller is designed to control temperature for various applications, such as heating rod, heating pad, electric water heater, compressor, heat pump, etc. This manual provides instructions on how to use the controller effectively.

Important Notes:

  1. The maximum output current of the controller is 10A (110Vac/220Vac). Please do not exceed this limit.
  2. For resistive loads such as heating rod, heating pad, electric water heater, etc., the recommended maximum power is ≤ 800W. For inductive loads such as compressor, heat pump, etc., the recommended maximum power is ≤ 275W.
  3. Please read and understand all instructions before using the controller.

Key Operation Instructions:

  1. Normal Working Status: In normal working status, the screen displays the real-time temperature.
  2. Setting Start Temperature: Press the UP key once. The screen will display the start temperature.
  3. Setting Stop Temperature: Press the DOWN key once. The screen will display the stop temperature.
  4. Changing Start Temperature: To change the start temperature, hold the UP key until the LED flashes. Then, press the UP or DOWN key to adjust the temperature as needed.
  5. Changing Stop Temperature: To change the stop temperature, hold the DOWN key until the LED flashes. Then, press the UP or DOWN key to adjust the temperature as needed.
  6. Switching between Celsius and Fahrenheit: Press and hold the UP and DOWN keys simultaneously for 3 seconds to switch between Celsius and Fahrenheit.
  7. Resetting to Default Settings: To reset the controller to its default settings, press and hold the UP and DOWN keys simultaneously for 5 seconds.

Safety Instructions:

  1. Make sure the controller is properly connected to the power source and the load.
  2. Do not exceed the maximum power limits for resistive and inductive loads.
  3. Do not touch the controller with wet hands.
  4. Keep the controller away from heat sources, water, and flammable materials.
  5. Disconnect the power supply before installing or removing the controller.

In case of any malfunction or abnormal operation, please consult a qualified technician.

We hope that this manual helps you to use the KT3009 temperature controller effectively and safely. If you have any questions, please feel free to contact our customer support team.

Load instructionsThe max current of output is 10A (110Vac/220Vac).In order to make sure the controller work under high performance condition. We recommend to use maximum power≤ 800Wwhen you use resistive load such as heating rod, heating pad, electric water heater etc. We recommend to use maximum power≤ 275Wwhen you use inductive load such as compressor , heat pump etc.

Technical parameters:


2 keys3 keys
Power supply110V-220V AC
Temperature control Range-50°C~110°C
Resolution Ratio0.1°C(-9.9~99.9); 1°C( other range )
Measurement accuracy+/-0.1°C
Control accuracy0.1°C
Refresh Rate0.5s
SensorNTC10K waterproof sensor
OutputMAX10A socket direct output
Number ofBottons23
FunctionSet start temperature and stop temperatureSet start temperature, stop temperature,Temperature correction and delay start
Power consumptionStatic current<=35MA, attract current<=65MA
Output socket support EU plugYES

Package Content

  • 1 x Thermostat
  • 1 x English Manual

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