Worcester Bosch 8000 45kW Combi Boiler Including Flue & 15mm Scale Reducer

The Worcester Bosch 8000 45kW Combi Boiler Including Flue & 15mm Scale Reducer is a flagship heating package engineered for larger homes with high hot water demand. Complete with a horizontal flue kit and a 15mm Scale Reducer, this premium package delivers exceptional central heating, powerful mains-pressure hot water, and enhanced protection against limescale build-up in hard water areas. Combining Worcester Bosch's most advanced combi boiler technology with premium installation accessories, it offers outstanding efficiency, reliability, and long-term performance.

Part of the award-winning Greenstar 8000+ range, this boiler features a robust stainless steel heat exchanger, intuitive full-colour display, QuickTap® hot water technology, and compatibility with Bosch EasyControl smart heating controls. Its modern design, quiet operation, and installer-friendly construction make it an excellent choice for high-performance domestic heating systems.

Key Features

• 45kW Natural Gas Combination (Combi) Boiler
• Includes Horizontal Flue Kit
• Includes 15mm Scale Reducer
• Fuel Type: Natural Gas
• Instant mains-pressure hot water
• No separate hot water cylinder required
• ErP A Rated for heating and hot water
• Up to 94% efficiency
• Stainless steel primary heat exchanger
• QuickTap® hot water pre-heat function
• Full-colour LCD display
• Quiet operation
• Compatible with Bosch EasyControl
• Intelligent boiler modulation
• Automatic filling loop compatible
• Modern premium design
• Up to 12-Year manufacturer's warranty (subject to installation, registration, and warranty terms)

Ideal for Larger Homes

The Worcester Bosch 8000 45kW Combi Boiler is ideal for larger homes with multiple bathrooms and higher domestic hot water demand. It delivers powerful central heating alongside instant hot water directly from the mains, eliminating the need for a separate hot water cylinder while maintaining excellent flow and pressure throughout the property.

The included 15mm Scale Reducer helps reduce limescale accumulation, protecting the boiler and maintaining peak efficiency in hard water areas.

Powerful Heating & Instant Hot Water

Delivering 45kW domestic hot water output and an impressive 18.2 litres per minute flow rate (Δ35°C), the Greenstar 8000 provides exceptional hot water performance for multiple bathrooms, showers, and taps simultaneously.

Its innovative QuickTap® technology pre-heats the plate heat exchanger to reduce waiting time for hot water while minimising water waste, ensuring maximum comfort and convenience.

Compact Design

Despite its powerful output, the Greenstar 8000 maintains a sleek, wall-mounted design suitable for a wide range of installations.

Dimensions

• Height: 780mm
• Width: 440mm
• Depth: 365mm

The included horizontal flue and 15mm Scale Reducer provide a complete installation package while helping ensure reliable long-term boiler performance.

Advanced Energy Efficiency

Rated ErP A with up to 94% efficiency, the Greenstar 8000 helps reduce gas consumption while maintaining outstanding heating and hot water performance.

Its advanced condensing technology and intelligent modulation automatically adjust boiler output to match household demand, helping improve seasonal efficiency and reduce running costs.

Smart Heating Control Compatibility

The Greenstar 8000 is fully compatible with Bosch EasyControl, allowing homeowners to control heating remotely, create personalised schedules, and optimise energy usage through intelligent temperature management.

Reliable Performance & Easy Maintenance

Designed with Worcester Bosch's premium engineering, the Greenstar 8000 features a durable stainless steel heat exchanger, removable side panels, and an installer-friendly internal layout for faster servicing and maintenance.

Its modern full-colour display provides clear diagnostics and simple operation, while its quiet performance makes it suitable for installation in kitchens, utility rooms, and open-plan living spaces.

Warranty & Peace of Mind

The Worcester Bosch 8000 45kW Combi Boiler Including Flue & 15mm Scale Reducer includes up to a 12-Year manufacturer's warranty when installed and registered in accordance with Worcester Bosch's warranty requirements.

Why Choose the Worcester Bosch 8000 45kW Combi Boiler Including Flue & 15mm Scale Reducer?

• Complete boiler, flue, and scale protection package
• Powerful 45kW combi boiler
• Natural Gas compatible
• 18.2 L/min domestic hot water flow rate
• Includes Horizontal Flue
• Includes 15mm Scale Reducer
• QuickTap® hot water technology
• Bosch EasyControl compatible
• Premium stainless steel heat exchanger
• Up to 12-Year manufacturer's warranty