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Will Nest Thermostat modulate a Vaillant Combo Boiler?

jamesgc
Community Member

I've been told that the Nest E will not modulate my new Vaillant boiler in the same way that the Vaillant thermostat will do, resulting in less efficiency. 

Is this accurate? 

Does this mean that the Nest thermostat will instead cycle the boiler (on/off) instead of carefully modulating it? 

Also what's the main different with the Nest Learning Thermostat? Is it worth the extra money? I need two devices and its getting quite pricey. 

 

Thank you. 

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