So I recently purchased a Shelly Plus HT as a replacement for my Nest thermostat and and a shelly plus 1 relay to replace the Nest heatlink. It’s been a good experience.
Over the past 4 years, I’ve had one Nest thermostat die due to wifi chip failure (the infamous W5 error), and two heatlinks die - one due to power failure, and a second due to the relay failing. In the UK, Europe and here in NZ, the heatlink is used to wirelessly (or wired) connect the thermostat to the hotwater boiler to call for heat.
Anyway, I’ve now moved to using a shelly plus 1 to ‘call for heat’ from the boiler. It works great, integrated into HA (I use MQTT).
Although the replacement Nest thermostat is still working, it doesn’t update as often as I’d like - sometimes 30 minutes or more - and I’m also keen to drop the Google integration and its requirement for online and cloud. So, I first tried a Tado Smart AC V3+ thermostat. It integrated easily locally using HA’s Homekit device integration, but seemed to be poorly calibrated - probably why it was being sold second hand.
So I next tried a Shelly Plus HT (would have ordered an HT gen3 - but clicked the wrong picture on aliexpress and didn’t realise until too late…). As other’s have reported, it’s a bit fiddly to set up, since you can only connect to its AP and to its built-in web GUI when it’s in ‘SETUP’ mode, which it switches itself out of after a brief period, requiring another push of the reset button (annoying not accessible without taking off the back cover - or drilling a whole though it).
Once set up, and integrated into HA (using the shellies Gen2 discovery and announce scripts from HACS), it’s been brilliant. Updates every 5 minutes at 0.1°C increments, which is more than adequate to control the house temperature.
Compared to the Nest, it updates much more frequently - every 5 minutes when powered by USB, and accurately as per the screencap below. The Nest is in blue and the Shelly Plus HT is in purple. The jump on the HT at 1900 is because I reduced the temp. offset, based on a 3rd thermometer. I think the Nest reads a little warm, and the HT a little cool.
Recommended! And yes, being OCD, I’ve got the gen3 on order, even though it really only adds a clock, and 8MB instead of 4MB of flash memory, FWIW.
