[Z-Wave Review] 2GIG Radio Thermostat (CT100)

2GIG CT100 Radio Thermostat

What is it?

The 2GIG CT100 Radio Thermostat is a Z-Wave controllable thermostat. It supports both gas and electric systems, with up to 4-stages for a heat pump with aux. The thermostat does have a C-wire for power, or it can be powered with 4-AA batteries if you aren't wired for a powered thermostat. Battery life is rated at 2 years if no C-wire is connected.

This device contains a Z-Wave seris 300 chip and includes a 1-year warranty.

Full spec sheet can be found here (PDF).

Why would I want this?

Most modern houses have a HVAC system controlled by a thermostat. A Z-wave controlled thermostat will allow you to manage your HVAC system without getting out of bed, and also create automation rules to just work the way you want.

Does it work?

It does. I first used the 2GIG CT-30 back in 2012 with a Vivent system. It had a few issues, but I was able to control my temperature, operation mode, and fan mode remotely which is exactly what I wanted. This CT100 is the newer model, and the first one I bought about a year ago and have been using on my downstairs unit. The one used for this post was a second one that was provided by The Smartest House. It has been installed on my upstairs unit.

What's in the box?

Insode the box you'll the thermostat, mounting hardware, instruction booklet, and cable labels.

Front of box

Inside box

Was the inclusion easy?

Of all the Z-Wave devices I've ever used, I find that the inclusion process for these thermostats (both the CT-30 and the CT100) to be the most involved, but definitely not difficult. For my setup, I first stopped home assistant and started up open zwave control panel. I put my z-stick controller in inclusion (secure) mode, and went to the thermostat. You then have to press the MENU button, and tap the radio icon on the screen. Tap it a second time and wait for it to change to LINK.
It's not a difficult process at all, but more involved than pressing a physical button like 99% of Z-Wave devices.

Once included, here is what I see in Open Z-Wave Control Panel.

Current values

There are no available configuration options within ozwcp, so there is nothing to show. I'm not sure if the device has configurable options or not, so it could just be that ozwcp is missing those configurations. Fortunately, there is full control of the unit without having Configuration options available.

Within Home Assistant thermostats show up as climate. entities. With the CT100 specfically, you will likely see 2 different climate. entities, along with 3 sensor. entities. Of the 3 sensors that show, 2 are duplicates for the current temperature and I ignore the second one. The third sensor is for the relative humidity.

Here this one is mounted on the wall.


My thoughts

For a straight rating, I'd say 4/5 stars. The price point is very attractive when compared to something like Nest, considering these are below $100. The physical design is nice, but not super modern, and the screen isn't as nice as it could be. I believe these have been around for a couple of years, so that's understandable, and I would love to see a new model with a more appealing screen and a Z-Wave Plus chip. I'd be happy to even pay more, say around the $125 price-point. However, there is nothing wrong with the current CT100 model and I'm happy to have one for both of my HVAC units.

For my Home Assistant setup, I have manually created input_selects and input_sliders to allow me to manually control each thermostat. By default Home Assistant will give a widget-like control for each thermostat, that you have to tap to get into the settings. I wanted direct control instead of having to go into a sub-menu, and I was able to create that with automation rules. My configs are on github here, if you want to look. Only complaint is a minor one and no fault of the thermostat, but this probably won't mount up good to your previous thermostat, so you may have to touch up some paint.

HVAC group

My Recommendation

If you have a HVAC system that you want to control with your home automation setup, this is the best way to go in my opinion. Home Assistant definitely can work with thermostats such as Nest, but they cost more than double and require cloud access to Nest's API. I much prefer a fully self-controlled setup and the CT100 allows for that.

The CT100 is sold by many retailers, but I'm very happy with The Smartest House and recommend buying from them.
The Smartest House - $69.95 Amazon - $84.75 (Prime)

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