Worcester Bosch Greenstar 4000 15kW System Boiler Including Flue & 15mm Scale Reducer

The Worcester Bosch Greenstar 4000 15kW System Boiler Including Flue & 15mm Scale Reducer is a premium heating package designed for homes with a sealed heating system and a separate hot water cylinder. Supplied with a horizontal flue kit and a 15mm Scale Reducer, this complete solution delivers dependable central heating while helping to minimise limescale build-up in hard water areas, protecting the boiler and maintaining long-term efficiency. Combining Worcester Bosch's renowned engineering, Quiet Mark certified operation, and smart heating control compatibility, the Greenstar 4000 is an excellent choice for homeowners seeking reliable, energy-efficient heating.

Designed for small to medium-sized homes, the Greenstar 4000 15kW System Boiler features a modern full-colour display, compact dimensions, and compatibility with Worcester Bosch EasyControl. Its installer-friendly design and quiet operation make it an ideal replacement for older system boilers while providing consistent heating performance and exceptional reliability.

Key Features

• 15kW System Boiler
• Includes Horizontal Flue Kit
• Includes 15mm Scale Reducer
• Fuel Type: Natural Gas
• Designed for sealed heating systems with a separate hot water cylinder
• ErP A Rated for heating
• Up to 94% central heating efficiency
• Quiet Mark certified
• Premium full-colour display
• EasyControl compatible
• Solar compatible
• Wide modulation range for improved efficiency
• Compact wall-mounted design
• Up to 10-Year manufacturer's warranty (subject to installation, registration, use of a Worcester Bosch system filter, and manufacturer's warranty terms)

Ideal for Modern Heating Systems

The Worcester Bosch Greenstar 4000 15kW System Boiler is ideal for smaller and well-insulated homes with a sealed heating system and a separate hot water cylinder. It provides reliable heating performance while efficiently supplying stored domestic hot water through the existing cylinder.

The included 15mm Scale Reducer helps minimise limescale formation, making this package particularly suitable for properties in hard water areas while helping to protect the boiler's heat exchanger over time.

Powerful Central Heating Performance

Delivering a 15kW central heating output, the Greenstar 4000 System Boiler provides efficient and consistent heating for smaller properties. Its advanced condensing technology and wide modulation range automatically adjust the boiler's output to match heating demand, helping reduce gas consumption while maintaining comfortable indoor temperatures throughout the year.

Compact Contemporary Design

Designed to fit neatly into kitchens, utility rooms, or airing cupboards, the Greenstar 4000 combines premium styling with excellent installation flexibility.

Dimensions

• Height: 724mm
• Width: 400mm
• Depth: 310mm

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

Advanced Energy Efficiency

Rated ErP A with up to 94% central heating efficiency, the Greenstar 4000 uses advanced condensing technology to maximise heat recovery while reducing fuel consumption.

Its wide modulation ratio enables the boiler to operate efficiently even during periods of lower heating demand, helping reduce running costs without compromising comfort.

Smart Heating Control Compatibility

The Greenstar 4000 is fully compatible with Worcester Bosch EasyControl, allowing homeowners to manage heating schedules remotely via smartphone or tablet. It is also compatible with solar thermal systems, providing additional flexibility for future renewable heating upgrades.

Reliable Performance & Easy Maintenance

Built to Worcester Bosch's renowned quality standards, the Greenstar 4000 features durable internal components, Quiet Mark certified operation, and an intuitive full-colour display for straightforward monitoring and control.

Its installer-friendly layout with front-access servicing helps simplify installation and ongoing maintenance while reducing servicing time.

Warranty & Peace of Mind

The Worcester Bosch Greenstar 4000 15kW System Boiler Including Flue & 15mm Scale Reducer includes up to a 10-Year manufacturer's warranty when installed and registered in accordance with Worcester Bosch's qualifying warranty conditions, providing long-term confidence and dependable after-sales support.

Why Choose the Worcester Bosch Greenstar 4000 15kW System Boiler Including Flue & 15mm Scale Reducer?

• Premium Worcester Bosch system boiler
• 15kW heating output
• Includes Horizontal Flue
• Includes 15mm Scale Reducer
• Designed for sealed heating systems
• 94% central heating efficiency
• Quiet Mark certified
• EasyControl compatible
• Solar compatible
• Up to 10-Year manufacturer's warranty