Rheem RETST800SYS EcoNet Control Center

May not work with dual 2.4/5.0 frequency routers but seems to work fine with 2.4 only. You can purchase a cheap 2.4 ghz only extender and set it up to provide a dedicated connection point for the wifi such as tp-link n300 extender.

If you have a RHEEM communicating system and you want a smart thermostat you will need this one.

This is wonderful. It is so nice to be able to control the temperature with my iPhone!!

Bought as a replacement for a broken EcoNet 601. Heating and Fan worked fine. In spring, the AC wouldn’t turn on. Called support and they confirmed the 800’s broke backwards compatibility and they no longer make EcoNet thermostats compatible with my furnace and told me to buy a new furnace or hunt down a discontinued thermostat.

Nice price, great unit

My contractor has installed three of these because the stand by screen is totally blank. The stand by screen for this device is supposed to show the weather, temperature and time. With the Backlight setting set to "on", the stand by screen has been just a blank screen on all three I've had installed. All other features on this theremostat work, but this stand by screen doesn't.

I did not purchase this from Amazon. My air-conditioning contractor installed it -- but left me to set it up. What should have been a simple procedure was a huge headache. It repeatedly told me a legitimate zip code was invalid, and repeatedly failed a simple wifi handshake. I had to do a hard reset, clear the cache, and lie about my zip code to get it working. Don't take my word for it. Ask AI. The bugs are well known.

Overall the EcoNet feels like an unfinished product and the users are the beta testers of a very expensive unit. The features seem to be focused for Rheem and the installer/service provider since they can "see" issues remotely and sometimes before it becomes a major issue. Not a terrible idea but if you've ever used a Nest or Ecobee you'll quickly notice that the EcoNet is 10-15 years behind from a user experience and features perspective. I called with some issues with the EcoNet thermostat that I can no longer live with, mainly it has put the furnace in off mode 3 times without being asked to and I only noticed when it started feeling cold in the house. Some other issues: The history doesn't populate in the app (known issue and this hasn't worked in the 3 months I've had it), the display won't turn completely off (proximity sensor works, but the screen is always on with the temp visible), only 4 time slots to schedule temperature changes per day and the time of day has to be the same for both heating and cooling, you can't run a fan schedule unless you are in fan only mode, and it doesn't integrate with my utility company for potential electricity savings during "rush hours". These are all features that a Nest Thermostat I bought 13 years ago could do.