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    Installation of Nest 3rd Generation (Vaillant ecoTec Pro 28)

    ?? I'd rather measure twice and cut once...
  2. S

    Installation of Nest 3rd Generation (Vaillant ecoTec Pro 28)

    Need some expert help. I'd rather just double check before going ahead and wiring a NEST 3 in. I've understood the L, N and Earth. Just confused with Grey and Black. Currently have a Salus and replacing with NEST. Does Black and grey stay in the RT ports as pictured and hook in Black to T2...
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