vaillant sustain

Hello all I hope you are well. I had a Vaillant EcoTec Sustain 28 Installed in January 2022 under the Eco Scheme. I only had a Choice of Manufacturer, I chose Vaillant, however, I did not have any say in the Model or Kw Rating of the Boiler, that was left to the Eco Scheme and the Installers...