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Vaillant ecoTEC Plus and Pro boilers are room-sealed fan-assisted (RSF) appliances that can be installed with horizontal and vertical flues. They use the standard 100mm diameter concentric flue system, but an optional larger 125mm diameter concentric flue system is available allowing longer flue lengths to be achieved if required. All Vaillant flues feature simple push-fit connections and a smart white finish.

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