The Vaillant eco TEC plus 400 high efficiency heat only series is one of the most compact and versatile boiler ranges ever developed by Vaillant. Easy to install and operate, they offer the ideal upgrade solution for a traditional open-vented heating system, providing fantastic efficiency levels and high performance with great useability. It's compatible with the full range of Vaillant's flue and control ranges, and comes with a 5-year guarantee, upgradeable to 10 years when registered through Vaillant Advance and fitted with a Vaillant branded filter, giving customers complete peace of mind. Extremely reliable and displaying all the in-built quality you?e come to expect from Vaillant, the ecoTEC plus is clearly one of the best open vent solutions available today ? where homes utilise a traditional open-vented system to provide their heating and hot water, the ecoTEC plus open vent boiler is the ideal way to deliver exceptional energy efficient performance. The ecoTEC plus open vent boilers are the most compact boilers ever developed by Vaillant, this kitchen-friendly design, along with excellent siting versatility and low lift weight ensure a quick and straightforward installation. They are compatible with Vaillant's fantastic push-fit flue system, providing further flexibility of installation, and easier fluing options. The Vaillant ecoTEC is also simple to use, with push button programming allowing for the easy control of heat levels within the building, using less fuel ultimately saving money. They are also compatible with all Vaillant controls, including smartphone controls for remote control. 5 year manufacturer warranty SEDBUK Band 'A' rated fuel efficiency Compact and lightweight Built-in two stage frost protection Compatible with all Vaillant controls Push button programming for ease of use Comprehensive status and diagnostic information Push-fit flue system Fully modulating low NOx burner and fan Quiet Mark accredited