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Old 13.09.2017, 16:56
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Re: NEST Smart Thermostat

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So they do not have to be NEST products right? I think like I am going to disturb you a lot Tom
Mine are Homematic. You can set them up as standalone or with a CCU2 control unit, you can control them via a web interface, or via Home Automation software such as openHAB.

I ought to elaborate: A NEST thermostat can only work 'alone' when it replaces another suitable wall mounted thermostat. If you don't have one, you can't simply use NEST (without some wiring).

The radiator thermostats I'm describing can only be used with NEST if you use some third-party linking system that can communicate with the NEST thermostat and the radiator valves.

You could link them, via openHAB to those cool looking but expensive NEST thermostats but that's not actually necessary as the Homematic thermostats (and others like it) have thermometers built in.

This is what my panel display looks like. The 'circles' allow you to control the temperature of the two room directly:
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Last edited by Tom1234; 13.09.2017 at 17:51.
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Old 13.04.2018, 09:18
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Re: NEST Smart Thermostat

Are there any experts out there that have come across the siemens/landis QAA range of thermostats?

I have a spare NEST thermostat that i wanted to replace my ancient elco branded siemens/landis thermostat and set the ridiculously complicated controller (an RVP54) to always on. it seems to use just 2 low voltage wires to the thermostat so I suspect it may be a proprietary serial based system that the NEST will not be able to work with.

there do seem to be a few other unused wires behind the thermostat (unlabelled of course!) that maybe would allow me to bypass the controller completely. i hate to admit it but it may require a 'professional'.....
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Old 17.04.2018, 12:03
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Re: NEST Smart Thermostat

Without knowing the model of thermostat you have it's hard to be sure but you should normally have two wires at 24V if you say it's low voltage. This will work with Nest which is also 24V in the USA... but Nest is sold across much of Europe with the Heatlink, the device at works with 240V boilers and sends 12V to the Nest thermostat so you need to check and if necessary think about a transformer.

As you can see it's getting more complicated than a fit and forget but a good electrician should be happy to visit, the testing and wiring should take under an hour for a pro.
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