The ecoFit Pure 435 heat only boiler is one of the most compact and versatile boilers ever developed by Vaillant. Easy to install and operate, its the ideal upgrade solution for a traditional open-vented heating system providing fantastic efficiency levels and high performance, with great usability. Compact dimensions and stylish design Excellent siting versatility and easy installation Top or rear flue options Compatible with the full range of Vaillant accessories Standard 2 year warranty extended to 5 years when installed by a Vaillant Advance Installer Vaillant ecoFit Pure 435 (ErP) Open Vent Boiler Only