Open Term vs Relay Connection to Boiler
I am considering purchasing a Tado "Starter Kit – Wireless Smart Thermostat V3+" and lots of "Smart Radiator Thermostat V3+s".
My boiler is a "Remeha Avanta 30s", S-Plan with an external Megaflow hot water tank.
Before I purchase I have 3 questions I hope someone can answer:
1) Does the Wireless receiver in the starter kit allow for Open Them connectivity to the boiler?
2) If not would I be better getting an Extension kit?
3) What are the advantages to using a Open Therm connection to the boiler versus relay control? I have heard that OT might offer boiler output modulation and so be more efficient?
In other-words is the OT interface more than just a low-voltage on-off or does it depend on the boiler and or the version of OT it support?