Worcester Bosch Greenstar 4000 24kW System Boiler Including Flue & 15mm Scale Reducer

The Worcester Bosch Greenstar 4000 24kW System Boiler Including Flue & 15mm Scale Reducer is a premium heating package designed for homes with a sealed heating system and a separate unvented hot water cylinder. Supplied with a horizontal flue kit and a 15mm Scale Reducer, this complete solution delivers reliable central heating while helping to reduce limescale build-up in hard water areas, protecting the boiler and maintaining long-term efficiency. Combining Worcester Bosch's renowned engineering, quiet operation, and smart control compatibility, the Greenstar 4000 is an ideal choice for homeowners seeking dependable and energy-efficient heating.

Designed for medium-sized family homes, the Greenstar 4000 24kW System Boiler features a contemporary design, intuitive full-colour display, and compatibility with Worcester Bosch EasyControl. Its compact dimensions and installer-friendly design make it an excellent replacement for older system boilers while delivering consistent heating performance and exceptional reliability.

Key Features

• 24kW 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 24kW System Boiler is ideal for medium-sized homes with a sealed heating system and a separate hot water cylinder. It delivers dependable heating performance while providing stored hot water efficiently throughout the property.

The included 15mm Scale Reducer helps minimise limescale formation, making this package particularly suitable for homes in hard water areas while helping to protect the boiler's heat exchanger and maintain long-term performance.

Powerful Central Heating Performance

Delivering a 24kW central heating output, the Greenstar 4000 System Boiler provides powerful and efficient heating throughout the home. Its advanced condensing technology and wide modulation range automatically adjust the boiler's output to match heating demand, helping to reduce gas consumption while maintaining excellent comfort and lower energy bills.

Compact Contemporary Design

Designed to fit neatly into modern homes, the Greenstar 4000 combines premium styling with practical 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 94% central heating efficiency, the Greenstar 4000 uses advanced condensing technology to maximise heat recovery while reducing fuel consumption.

Its wide modulation ratio allows the boiler to operate more efficiently 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 using a smartphone or tablet. It is also compatible with solar thermal systems, providing greater 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 operation.

Its installer-friendly layout, front-access servicing, and SimpleSwitch installation features help reduce installation time while making future maintenance quick and convenient.

Warranty & Peace of Mind

The Worcester Bosch Greenstar 4000 24kW 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 24kW System Boiler Including Flue & 15mm Scale Reducer?

• Premium Worcester Bosch system boiler
• 24kW 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