Vaillant Ecotech 435 Heat Only with Horizontal Flue & 15mm Scale Reducer

The Vaillant ecoTEC Plus 435 Open Vent Boiler is a premium 35kW heat-only gas boiler designed for traditional open-vented central heating systems. Combining high heating performance with advanced condensing technology, it provides efficient, reliable, and quiet operation for larger homes with higher heating demands. It is designed to work alongside a separate hot water cylinder and cold water storage tank, making it an ideal replacement for older regular boilers.

Its compact dimensions, flexible installation options, and intuitive controls make the ecoTEC Plus 435 an excellent choice for homeowners looking for dependable heating performance without compromising on efficiency.

Key Features

• 35kW heat-only (Open Vent) gas boiler
• Fuel Type: Natural Gas
• Designed for traditional open-vented heating systems
• High-efficiency condensing technology
• ErP A Rated for heating efficiency
• Compact wall-mounted design
• Stylish, modern appearance
• Built-in two-stage frost protection
• Push-button controls with comprehensive diagnostic display
• Compatible with the full range of Vaillant heating controls
• Front-access components for easier servicing
• Standard 5-year manufacturer's warranty
• Up to 10-year warranty available when installed by a Vaillant Advance Installer (subject to terms and conditions)

Designed for Traditional Heating Systems

The ecoTEC Plus 435 is specifically engineered for homes with an open-vented central heating system, operating alongside a separate hot water cylinder and cold water storage tank.

Unlike a combi boiler, this model focuses exclusively on central heating. It is an excellent choice for larger properties where stored hot water and high heating capacity are required.

Powerful 35kW Heating Performance

Delivering a 35kW central heating output, the ecoTEC Plus 435 is the most powerful model in the ecoTEC Plus Open Vent range, making it ideal for large homes and properties with extensive radiator systems.

Its intelligent burner modulation automatically adjusts the heating output to match demand, helping improve efficiency while reducing unnecessary gas consumption.

The boiler provides a heating output range of approximately 7.5kW to 37.1kW in condensing mode, ensuring reliable and economical performance throughout the year.

Compact Installation

Despite its powerful output, the ecoTEC Plus 435 retains a compact design that offers excellent installation flexibility.

Dimensions

• Height: 602mm
• Width: 375mm
• Depth: 320mm

Its wall-mounted construction makes it suitable for installation in kitchens, utility rooms, and airing cupboards while allowing convenient access for servicing and maintenance.

Energy Efficient Heating

Built with Vaillant's advanced condensing technology, the ecoTEC Plus 435 achieves an ErP A Rating for central heating efficiency. Intelligent modulation technology optimises gas consumption while maintaining stable indoor temperatures and reducing operating costs.

Smart Heating Control Compatibility

The ecoTEC Plus 435 is fully compatible with Vaillant's range of smart thermostats and heating controls, allowing homeowners to optimise heating schedules, improve efficiency, and increase comfort.

It can also be integrated into selected hybrid heating systems alongside compatible Vaillant renewable technologies, offering greater flexibility for future heating upgrades.

Reliable Performance All Year Round

Designed for long-term reliability, the ecoTEC Plus 435 features built-in frost protection, comprehensive onboard diagnostics, and intuitive push-button controls. Its robust engineering and quiet operation make it a dependable solution for demanding heating systems throughout every season.

Warranty & Peace of Mind

The Vaillant ecoTEC Plus 435 includes a 5-year manufacturer's warranty as standard. When installed and registered by an eligible Vaillant Advance Installer, the warranty may be extended to 10 years, providing additional long-term protection and peace of mind.

Why Choose the Vaillant ecoTEC Plus 435?

• Powerful 35kW heat-only gas boiler
• Ideal for large traditional open-vented heating systems
• Compact wall-mounted installation
• High-efficiency condensing technology
• ErP A Rated performance
• Smart heating control compatibility
• Quiet and reliable operation
• Easy installation and servicing
• Up to 10-year warranty available
• Trusted Vaillant engineering with outstanding long-term reliability