Three nest thermostats to control three floors.

[tomceb]

Hi.  I have gas-powered underfloor (water) heating, Bosch (older system from 2010).  It's  driven by the main thermostat unit installed in the working room ( with a help of an outdoor sensor). 

We're heating a three-floor home, each floor is driven by a separate pump, each of them pumping into multiple underfloor circuits.   it's around 200 m2  in total. 

It's balanced quite well, I can adjust/fine-tune each room via a valve for separate circuits.   It would be best to have a thermostat to control each room, but that investment is really overkill, considering that 12 month gas bill is less than 500€.  House is well insulated. 

However, three pumps are running all the time (60 watts each) during the heating season.  Bosch thermostat controls the main pump that runs the primary circuit (the one that exchanges the heat with the three pumps). 

I'm thinking of two solutions; one that would 'kill' all pumps running while the primary pump is off, and second, 

installing a smart thermostat on each of the floors, each thermostat should be able to control the primary pump and secondary pump for the dedicated floor. 

Is nest capable of this scenario? 

I was thinking of a smart home solution, for example,  loxone, that would control everything, but I'm biased towards stand-alone systems that can be controlled independently. 

Thanks a lot!

[CoolingWizard]

It does not need to be a smart thermostat unless you want to be able to manipulate the temperature of any of the rooms remotely via a phone app.  Your in-floor heating system should have been installed with the control interlocks already.  Your system should be set up so that if any room wants heat, it’s call for heat would also generate a call for the main pump to turn on in addition to the pump servicing that particular room. With this type of an interlock system, the main pump will only run, when hot water is needed in one of the sub-rooms. 

So the advantage of a smart thermostat is it can learn the heating time to reach the set point. In this capability if a heating schedule is used, that schedule would activate the pumps at point in time that the room will be at the temperature set point at the designated schedule time.  The longer the thermostat is on operation the more accurate the algorithm becomes. 

No for your system you have to decide if you want to put in some control system that will act the way you desire.  The main pump only turns on when one of the rooms is calling for heat and run constantly.  The other question is how fast does the main water source come up to temperature for servicing the pipes?

The AC Cooling Wizard

[aatienza]

Hey tomceb,

I'd like to jump in here and check if you've seen CoolingWizard's response. Let us know if you need more help by replying to this thread.
 

I appreciate the help, CoolingWizard.

Thanks,
Archie

[EmersonB]

Hi everyone,

@tomceb, we wanted to follow up and see if you are still in need of any help. Please let us know if you are still having any concerns or questions from here, as we would be happy to take a closer look and assist you further.

I appreciate the help, CoolingWizard and Archie.
 
Best,
Emerson

[EmersonB]

Hey tomceb,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, we would be happy to keep it open. If there's more we can do, just let us know.
  
Regards,
Emerson