Hands on Review: Inkbird C909 1,500 Watt Digital Temperature Controller

I’ve used an Inkbird Dual Stage Temperature Controller, model ITC-308 for years on my fermentation deep freeze and have loved it.  Check out my Hands on Review of that game-changing controller.

As part of a move and a resulting kegerator update and refresh, I decided to replace my old temp controller (from a now defunct manufacturer) and ended up settling on Inkbird’s single stage C909.  That model was attractive because I’ve been extremely happy with Inkbird’s gear and I really like the fact that it plugs directly into an AC socket.  The wall I now have my kegerator on has no studs to mount a controller.  Because this is an Outlet Thermostat, the C909 solves that.

Note that the C909 is a swiss army knife of sorts, it has several different modes of operation including – timer, temperature controller, humidity sensor and cooking thermometer.  The C909 recognizes which probe type is plugged in (defaults to timer mode with no probe) and automatically switches to that mode.  For this review, I will be discussing the temperature control mode only.

Why Use an Over-Riding Temperature Controller?

Refrigerators and chest freezers are designed to do particular tasks.  As homebrewers, fermenters and home kegerator owners, we are asking these devices to do slightly different things and operate in different temperature ranges than built in thermostats allow for.  Over-riding temp controllers cycle power on and off to give you more fine tuned control.  This allows you to convert a chest freezer into a kegerator or fermentation chamber.

Hands On Review of Inkbird’s C909 in Temp Controller Mode

Front of the box.  Nice packaging, not a lot of info on the front of the box.

Back of the box. Shows model number and electrical specifications.  Note that the maximum power for this unit is 1,500 Watts at 110 Volts

Front of the unit.  LCD screen.  Operation light (top right).  Three menu buttons and power plug receptacle.

Back of the unit

Temperature probe.  The wire and probe look and feel well built.

Probe plugged into the unit.  Note: This action causes this multifunction device to switch into temp controller mode.

Plugged into the wall.  Note that there is room for a plug to utilize the space below the controller.

My practice is to zip tie the temp controller probe to a can.  See: Kegerator Beer Line Temperatures & Reducing Foam.  I think this works really well

My kegerator.  The C909 is on the right side.  The temperature probe is on the far left of the kegerator.  This nice long 6.56′ probe cable.

Plugged in and controlling my kegerator like a champ.  In cooling mode this displays the current temperature on the left and the high and low thresholds on the right.  Note the green light on the top right corner.  That signals the the unit is currently powering my freezer and calling for cooling.

High and lower thresholds. The C909 works slightly different compared to other temp controllers I’m familiar with.  Typically, you set target temperature and that’s it.  Another setting (sometimes called the differential or offset value) is set that tells the controller how close to keep the temperature to the set point.  Example: Controller set to 40 degrees, Offset set to 3 degrees, Temp Controller kicks on at 43 degrees.  With the C909 you set the upper and lower boundaries on your own.  I really like that and think it’s more straightforward..

Inkbird C909 Specifications and Options of Interest –

  • Heating or Cooling.  This can trigger a heating or cooling device.
  • Screen reads RUN or PAUSE to indicate current operation
  • The unit can be calibrated
  • A compressor delay function is included.  That’s important because it keeps the controller from kicking on and off too quickly and helps to protect your fridge or freezer’s compressor.
  • High and lower audible alarms are also available
  • 1,500 Watt output should be suitable for most homebrew applications.
  • Temperature Range: -58~212°F
  • Can display in either deg C or deg F

Final Thoughts

This is a feature packed temperature controller that’s well thought out.  The fact that it does not need mounted is a great benefit.  This single stage controller is well suited for most kegerator or keezer applications as most of the time, heating is not required.  If you’re looking for a dual stage controller, consider Inkbird’s Itc-308 – Hands on Review.  The C909 is another great controller from Inkbird.

Inkbird C909 1500W Digital Heat or Cool Temperature Controller – via Amazon


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4 thoughts on “Hands on Review: Inkbird C909 1,500 Watt Digital Temperature Controller

  1. Richard

    What is the temp range on this? You’re using it in a keezer, and your pic shows 38/39F..
    But your spec list, as well as Amazon, show a range of 58-212F.

  2. Jonathan

    Do you still use this as a keezer controller? I’m thinking about switching to the C929, I’m just wondering about protecting my keezer. I currently use the Inkbird ITC-308.


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