If your Vaillant boiler has heating but no hot water, this is one of the most common faults seen by Gas Safe engineers across Surrey and London, particularly on Vaillant ecoTEC combi boilers. In many cases, the boiler appears to work normally for central heating. However, when a hot tap is opened, the boiler fails … Continue reading Vaillant Boiler Has Heating but No Hot Water? Causes and Fixes