Vaillant Ecotech 836 Combi Boiler with Horizontal Flue & 15mm Scale Reducer

The Vaillant ecoTEC Plus 836 Combi Boiler is a premium 36kW combination boiler engineered to provide powerful central heating and high-flow mains-pressure hot water without the need for a separate hot water cylinder or cold water storage tank. Combining Vaillant's latest condensing technology with intelligent combustion management, it delivers exceptional efficiency, reliability, and comfort for larger homes with higher hot water demands.

Designed for busy households with one or two bathrooms, the ecoTEC Plus 836 features an intuitive semi-touch interface, smart connectivity, and advanced combustion control. Its compact dimensions and installer-friendly design make it an excellent choice for both new installations and like-for-like boiler replacements.

Key Features

• 36kW Combination (Combi) Gas Boiler
• Fuel Type: Natural Gas
• Instant mains-pressure hot water
• No hot water cylinder required
• ErP A Rated for heating and hot water
• High-efficiency condensing technology
• Intuitive semi-touch user interface
• IoniDETECT intelligent combustion technology
• Up to 1:10 modulation ratio
• Domestic hot water flow rate: 17.2 L/min (Δ30°C)
• Domestic hot water flow rate: 14.8 L/min (Δ35°C)
• Hydrogen Blend Ready (up to 20%)
• Adaptive LPG compatible
• Smart home ready with myVAILLANT connect
• Stainless steel heat exchanger
• Compatible with Vaillant heating controls
• Standard 5-year manufacturer's warranty
• Extendable to 10 years when installed by a Vaillant Advance Installer (subject to terms and conditions)

Ideal for Larger Homes

The ecoTEC Plus 836 is designed for medium to large homes with one or two bathrooms and higher domestic hot water demand. As a combi boiler, it delivers central heating and hot water directly from the mains, eliminating the need for separate cylinders or storage tanks.

Its compact dimensions make installation straightforward while providing powerful heating and excellent hot water performance for busy households.

Powerful Heating & High Hot Water Performance

With a 36kW heating output and a domestic hot water flow rate of up to 17.2 litres per minute (Δ30°C), the ecoTEC Plus 836 comfortably supplies multiple hot water outlets while maintaining excellent heating performance.

Vaillant's IoniDETECT intelligent combustion technology continuously monitors gas quality and automatically adjusts burner performance for maximum efficiency. Combined with a 1:10 modulation ratio, the boiler precisely matches output to demand, helping reduce gas consumption while maintaining consistent comfort.

Compact Design & Easy Installation

The ecoTEC Plus 836 retains Vaillant's familiar installation footprint, making it an ideal replacement for previous ecoTEC models.

Dimensions

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

Its redesigned internal layout provides easy access to major components, reducing installation time and simplifying future servicing.

Advanced Energy Efficiency

The ecoTEC Plus 836 combines intelligent combustion management with high-efficiency condensing technology to maximise seasonal efficiency while reducing household energy costs.

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 the UK's energy network evolves.

Smart Heating Control Compatibility

Fully compatible with myVAILLANT connect and Vaillant's latest range of smart heating controls, the ecoTEC Plus 836 enables homeowners to monitor and control heating remotely via smartphone.

Its intelligent modulation and weather compensation capabilities help improve comfort while optimising energy efficiency throughout the year.

Reliable Performance & Easy Maintenance

Built with a durable stainless steel heat exchanger, adaptive LPG compatibility, and Vaillant's intelligent linBUS communication technology, the ecoTEC Plus 836 is engineered for dependable long-term performance.

Its guided commissioning wizard and improved internal accessibility make installation, servicing, and maintenance faster and easier for heating engineers.

Warranty & Peace of Mind

The Vaillant ecoTEC Plus 836 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 confidence and protection.

Why Choose the Vaillant ecoTEC Plus 836?

• High-performance 36kW combi boiler
• Instant mains-pressure hot water
• Up to 17.2 L/min hot water flow rate
• IoniDETECT intelligent combustion technology
• Up to 1:10 modulation ratio
• Hydrogen Blend Ready (20%)
• Adaptive LPG compatible
• Smart home ready
• Stainless steel heat exchanger
• Up to 10-year warranty available