The ecoTEC pro 24 and 28 combination boilers have the same high build quality as ecoTEC plus combi models but with a more basic specification. Vaillant’s ecoTEC pro range of combination boilers feature comprehensive status and diagnostic information with simple push button operation for easy commissioning and servicing. Both models feature Vaillant’s ‘Aquacomfort’ system that provides instantaneous hot water at a constant temperature. The ecoTEC pro range have the benefit of a 1 year warranty.