Vaillant Ecotech 620 System Boiler with Horizontal Flue & 15mm Scale Reducer

The Vaillant ecoTEC Plus 620 System Boiler is a premium 20kW system gas boiler designed for homes with sealed heating systems and a separate unvented hot water cylinder. Featuring Vaillant's latest condensing technology, intelligent combustion management, and a modern semi-touch interface, it delivers reliable heating performance while helping reduce energy consumption and running costs.

Designed with both installers and homeowners in mind, the ecoTEC Plus 620 offers a familiar installation footprint, simplified servicing, and compatibility with Vaillant's complete range of heating controls, accessories, and renewable technologies.

Key Features

• 20kW system gas boiler
• Fuel Type: Natural Gas
• High-efficiency condensing technology
• ErP A Rated heating efficiency
• Designed for sealed heating systems with an unvented hot water cylinder
• New intuitive semi-touch user interface
• IoniDETECT intelligent combustion technology
• Up to 1:10 modulation ratio for improved efficiency
• Automatic LPG conversion without additional conversion kit
• Hydrogen Blend Ready (up to 20%)
• Smart home ready with myVAILLANT connect
• Compatible with Vaillant heating controls and accessories
• Easy-access internal layout for faster servicing
• Standard 5-year manufacturer's warranty
• Extendable to 10 years when installed by a Vaillant Advance Installer (subject to terms and conditions)

Ideal for Sealed Heating Systems

The ecoTEC Plus 620 is designed for sealed central heating systems that use a separate unvented hot water cylinder. This makes it an excellent choice for homes requiring reliable heating while allowing multiple outlets to access stored hot water simultaneously.

With an integrated pump and expansion vessel, installation is simplified while maintaining excellent system performance.

Efficient 20kW Heating Performance

Delivering a 20kW central heating output, the ecoTEC Plus 620 is ideal for small to medium-sized homes with moderate heating demands.

Vaillant's IoniDETECT combustion technology continuously monitors combustion quality and automatically adjusts burner performance. Combined with a 1:10 modulation ratio, the boiler operates efficiently across varying heating loads, reducing gas consumption and improving comfort.

Compact Design & Easy Installation

The ecoTEC Plus 620 maintains the same installation footprint as previous ecoTEC models, making it perfect for straightforward replacements.

Dimensions

• Height: 720mm
• Width: 440mm
• Depth: 352mm

Its redesigned internal layout provides easier access to key components, helping installers reduce servicing time and simplifying future maintenance.

Advanced Energy Efficiency

The ecoTEC Plus 620 combines intelligent combustion management with advanced condensing technology to maximise seasonal efficiency while lowering fuel consumption.

The boiler is also Hydrogen Blend Ready, allowing safe operation with gas supplies containing up to 20% hydrogen, helping future-proof your heating system as energy infrastructure evolves.

Smart Heating Control Compatibility

Compatible with myVAILLANT connect and Vaillant's latest smart heating controls, the ecoTEC Plus 620 allows homeowners to manage heating remotely, improve comfort, and optimise energy usage.

It also integrates seamlessly with Vaillant renewable technologies and hybrid heating systems for greater long-term flexibility.

Reliable Performance & Easy Maintenance

The ecoTEC Plus 620 features Vaillant's linBUS technology, providing intelligent monitoring of flow rates and pump performance for improved system optimisation.

Combined with its guided commissioning wizard, intuitive controls, and accessible internal layout, installation and servicing are quicker and more straightforward than previous generations.

Warranty & Peace of Mind

The Vaillant ecoTEC Plus 620 comes with a 5-year manufacturer's warranty as standard. When installed and registered by an eligible Vaillant Advance Installer, the warranty can be extended to 10 years, offering additional long-term peace of mind.

Why Choose the Vaillant ecoTEC Plus 620?

• Efficient 20kW system gas boiler
• Ideal for sealed systems with a hot water cylinder
• Latest IoniDETECT intelligent combustion technology
• Up to 1:10 burner modulation
• Automatic LPG conversion
• Hydrogen Blend Ready (20%)
• Smart home compatible
• Compact design for easy replacement
• Simplified installation and servicing
• Up to 10-year warranty available