Vaillant Ecotech 625 System Boiler with Horizontal Flue & 15mm Scale Reducer

The Vaillant ecoTEC Plus 625 System Boiler is a premium 25kW system gas boiler designed for sealed central heating systems with a separate unvented hot water cylinder. Combining Vaillant's latest condensing technology with intelligent combustion management and a modern semi-touch interface, it delivers efficient, reliable heating while helping reduce energy consumption and running costs. The redesigned internal layout also makes installation and servicing quicker and more convenient for heating engineers.

Perfect for medium to large homes with higher heating demands, the ecoTEC Plus 625 offers smart home compatibility, hydrogen blend readiness, and advanced modulation technology, making it an ideal replacement for older system boilers or a future-ready solution for new heating installations.

Key Features

• 25kW 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
• Automatic LPG conversion (no conversion kit required)
• Hydrogen Blend Ready (up to 20%)
• Smart home ready with myVAILLANT connect
• Compatible with Vaillant heating controls, flues, and renewable technologies
• Familiar installation footprint for easy boiler replacement
• 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 625 is designed for sealed central heating systems that incorporate a separate unvented hot water cylinder. This configuration provides reliable heating while ensuring stored hot water is readily available throughout the home, making it ideal for households with multiple bathrooms.

Its integrated pump and expansion vessel simplify installation while delivering dependable day-to-day performance.

Powerful 25kW Heating Performance

Delivering 25kW of central heating output, the ecoTEC Plus 625 is well suited to medium and larger homes with greater heating requirements.

The boiler features IoniDETECT intelligent combustion technology, which continuously monitors gas quality and automatically adjusts combustion for optimum performance. Combined with a 1:10 modulation ratio, it operates efficiently even during periods of lower heating demand, reducing fuel consumption and improving overall comfort.

Compact Design & Easy Installation

The ecoTEC Plus 625 retains Vaillant's familiar installation footprint, making it an excellent replacement for previous ecoTEC models.

Dimensions

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

The redesigned internal layout provides easier access to all major components, reducing installation time and simplifying future servicing.

Advanced Energy Efficiency

The ecoTEC Plus 625 combines high-efficiency condensing technology with intelligent combustion management to maximise seasonal performance while lowering fuel consumption.

The boiler is also Hydrogen Blend Ready, allowing safe operation with gas supplies containing up to 20% hydrogen, helping prepare your heating system for future energy networks.

Smart Heating Control Compatibility

Fully compatible with myVAILLANT connect and Vaillant's latest smart heating controls, the ecoTEC Plus 625 enables homeowners to manage heating remotely and improve energy efficiency.

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

Reliable Performance & Easy Maintenance

Vaillant's linBUS technology provides more accurate monitoring of system flow rates and pump performance, improving efficiency and system optimisation.

Combined with its guided commissioning wizard, semi-touch interface, and improved service access, the ecoTEC Plus 625 is designed to simplify installation, maintenance, and long-term ownership.

Warranty & Peace of Mind

The ecoTEC Plus 625 includes a 5-year manufacturer's warranty as standard. When installed and registered by a Vaillant Advance Installer, the warranty can be extended to 10 years, providing additional long-term protection and peace of mind.

Why Choose the Vaillant ecoTEC Plus 625?

• Efficient 25kW system gas boiler
• Ideal for sealed heating systems with a hot water cylinder
• 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