As an Advanced Vaillant Engineer not only do you get the piece of mind that your work is being carried out by an accredited partner but you will also benefit from an extended warranty period on certain models, absolutely free.
Vaillant Ecotec Pro
5 year (up from 2) Guarantee available on ecoTEC pro models
Vaillant Ecotec Plus
7 year (up from 5) Guarantee available on ecoTEC plus and exclusive models