Vaillant ecoTec and Honeywell thermostats

Discussion in 'Plumbers' Talk' started by rk_diy, Sep 27, 2020.

  1. rk_diy

    rk_diy Member

    Can we use 3-wire honeywell thermostats (as slaves for additional zones) with Vaillants ecoTEC Boilers eBus wiring system (which will have a main VRC720 Vaillant controller) ?
     

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