by ericmark »
Sat Dec 02, 2017 6:11 am
[quote="Mr White"]Truth be known most if not all "smart room stats" are just a gimmick. They cost in the region of £200 (Including installation) and you will take years to recoup that. (More than the life of the stat itself)
At the end of the day they just turn on or off (The same as any other thermostat) so if the one you have does not work, it is probably incorrectly connected, in which case you had best engage the services of a person who has installed several before.
Some times it is easier to stand infront of something and physically look at it, this is one of those occasions.
19:27 29/11[/quote]
Not quite true, modern boilers are modulating and the flame height alters this is what the OpenTherm connections do, when the boiler does not have OpenTherm then it does simply switch on/off but good thermostats use anti-hysteresis software so as it approaches the temperature it uses a mark/space ratio to slowly reduce heat rather than simply switching off. It also has the ability to use IFTTT to connect to wifi TRV heads so either the heads tell the Nest when to turn down or Nest tells the heads according to how set up.
However I have to admit when I fitted the TRV electronic heads I found the house both cooled down and heated up too slow to be able to use the phones location to automaticity turn heating on as I got close to home.
For mothers house I had a problem, the bay window heats the living room up when the sun shines, so the heat requires varies with the cloud cover, using eTRV heads helped cure this problem, next step would be Nest, however since we rarely have the house unoccupied I did not really need Nest.
You show the old programmer base, but you don't say which boiler, how best to connect nest does depend on boiler, some have OpenTherm but most can't use that option.
So likely your best idea it to get some one in, who can work out how you boiler should be wired with Nest.
