Vaillant Commercial Controls. The VRC 700 is designed to work with the more complex system. If you have multiple heating zones, underfloor heating or you use renewable technologies, the VRC 700 is the control for you. The control can decide on the most efficient heating appliances to run while also accounting for the weather outside and your energy tariffs. The VRC 700 works with all Vaillant heating appliances including boilers, heat pumps and solar thermal systems, as well as hybrid systems.