The VR66/2 control centre lies at the heart of the Vaillant Total System Solution, allowing eBUS controllers to be combined with room thermostats, valves, multi-zone heating and domestic hot water cylinder systems. The VR66/2 has two functional modes: Multi-zone mode or Mono-zone mode. 

• Required to link the VRT 350F, VRC 470, VRC 470F or timeSWITCH 160 digital to a system or open vent boiler
• Only compatible with the new range of ecoTEC boilers produced from March 2012 
• Multi-zone operation mode is compatible with the VRT 350 programmable room thermostat (only) and system, combi and open vent boilers
• Mono-zone operation mode is compatible with the eBUS controller range and system or open vent boilers