I have a basic ON/OFF water heater which works in constant mode presently (no intelligence, nothing). I wanted to add some smart behaviour to optimize energy. I do have a SmartThings Hub2 and willing to purchase some “temperature sensors” to be able to better control the heat in various spots of the apartment.
After reading many posts, I realise that existing solutions are expensive because intelligence is in the Thermostat itself.
Considering, in our case, intelligence is in the Hub System, I conclude that ultimately there no need to invest in a smart Thermostat, this latter would only have to abide the commands from the SmartThings Hub ( 2gig CT100 was recomamnded at 70 USD).
In this case, I wonder what is added value of purchasing a thermostat. Would a z-wave enabled Relay not work to control the heather right from the ST smartApp, which collects temperature from temperature sensors and then order to turn heather on or not ?
I’m I missing an important component in the Thermstat setup ? ( beginner )