I'm looking to upgrade my central heating system with Tado, however my system has two controllers which can fire up the boiler independently and I don't understand why. One controller is for the hot water plus the downstairs underfloor heating with multiple zones controlled by thermostats, the other controller controls the upstairs radiators on a single thermostat. I'm happy to change all the thermostats for Tado Smart wired thermostats but don't know if the Tado controller will be compatible based upon the existing system. Any advice would be greatly appreciated