will it work in europe?

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  • My warm water in-floor radiant heating system is working with a central disposed thermostat.
    This thermostat works with a supply-,room- and outside air temperature to a
    adjustable heating characteristic. The thermostat is connected via an e-bus
    direct to the heating boiler. The low voltage is 3V (thermostat) and 24V.
    The heating system is a German Weishaupt condensing boiler.
    The e-bus ( RS 232) needs only two wires to the boiler.
    My question: Needs the Nest thermostat always 4-wires or is a 2-wires system

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