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Vaillant Domestic Boilers Vaillant’s range of ecoTEC high efficiency domestic gas boilers combines the finest German engineering and British manufacturing, to give you outstanding performance and long lasting reliability from your heating system. All of our ecoTEC boilers are high efficiency gas boilers made with the highest quality components, and are backed up with market leading guarantee packages. With a broad range of combination, system and open vent boilers available in outputs to suit all types of properties, the versatile ecoTEC range could provide the perfect boiler for your home. Choosing the right heating system for your home can sometimes be unnecessarily difficult, so to help you make an informed choice we’ve put together some guidance on each boiler within the ecoTEC domestic boiler range, answering some of the questions you might find yourself asking. If you’re still unsure what type of boiler you need, you may want to use our system finder to recommend the right product for your home.