Vaillant Ecotech 424 Heat Only with Horizontal Flue & 15mm Scale Reducer

The Vaillant ecoTEC Plus 424 Open Vent Boiler is a high-efficiency 24kW heat-only gas boiler designed for traditional open-vented central heating systems. Combining advanced condensing technology with Vaillant's trusted engineering, it delivers reliable heating performance, exceptional efficiency, and quiet operation for homes that use a separate hot water cylinder and cold water storage tank.

Its compact wall-mounted design, intelligent controls, and flexible installation options make the ecoTEC Plus 424 an excellent replacement for older regular boilers, providing dependable heating while helping reduce energy consumption.

Key Features

• 24kW 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
• Durable aluminium heat exchanger
• Built-in two-stage frost protection
• Push-button controls with digital status display
• Compatible with the full range of Vaillant heating controls
• Front-access components for easier servicing
• Excellent siting flexibility
• Standard 5-year manufacturer's warranty (extended warranty available with eligible Vaillant Advance installations)

Ideal for Traditional Heating Systems

The ecoTEC Plus 424 is specifically designed for homes with an existing open-vented heating system, operating alongside a hot water cylinder and cold water storage tank.

Unlike a combi boiler, this model is dedicated to central heating, making it an ideal solution for larger traditional systems where stored hot water is preferred.

Powerful 24kW Heating Performance

Delivering a 24kW central heating output, the ecoTEC Plus 424 is suitable for medium to larger homes with higher heating demands.

Its intelligent modulation technology automatically adjusts the boiler's output to match the heating requirement, improving efficiency while helping reduce gas consumption.

The boiler provides a heating output range of approximately 6.3kW to 25.7kW in condensing mode for consistent and economical operation.

Compact Design & Easy Installation

Despite its performance, the ecoTEC Plus 424 remains one of Vaillant's most compact heat-only boilers.

Dimensions

• Height: 600mm
• Width: 375mm
• Depth: 320mm

Its compact size allows installation in kitchens, utility rooms, and airing cupboards while offering excellent access for servicing and maintenance.

Energy Efficient Heating

Built with Vaillant's advanced condensing technology, the ecoTEC Plus 424 achieves a 93% seasonal space heating efficiency (ErP A Rated), helping homeowners lower fuel consumption without compromising comfort.

Smart Heating Control Compatibility

The ecoTEC Plus 424 works seamlessly with Vaillant's range of smart thermostats and heating controls, enabling homeowners to improve comfort while optimising energy efficiency.

It can also be integrated into compatible hybrid heating systems for greater flexibility and future-proof performance.

Reliable Performance All Year Round

Engineered for dependable operation, the ecoTEC Plus 424 includes built-in two-stage frost protection, comprehensive diagnostics, and user-friendly controls to ensure reliable performance throughout the year.

Its durable construction and straightforward servicing make it a trusted choice for both installers and homeowners.

Warranty & Peace of Mind

The Vaillant ecoTEC Plus 424 is supplied with a 5-year manufacturer's warranty as standard. When installed and registered by an eligible Vaillant Advance Installer, extended warranty options may be available, subject to Vaillant's current terms and conditions.

Why Choose the Vaillant ecoTEC Plus 424?

• Efficient 24kW heat-only gas boiler
• Ideal for traditional open-vented heating systems
• Compact wall-mounted installation
• Aluminium heat exchanger
• High seasonal efficiency
• Quiet operation
• Smart heating control compatibility
• Easy installation and servicing
• Reliable Vaillant engineering
• Built for long-term performance and everyday comfort