Worcester Bosch 4000 30kW Combi Boiler with 15mm Scale Reducer

The Worcester Bosch 4000 30kW Combi Boiler with 15mm Scale Reducer is a premium heating package designed to deliver powerful central heating and exceptional mains-pressure hot water for medium to larger homes. Supplied with a 15mm Scale Reducer, this complete solution helps minimise limescale build-up in hard water areas, protecting the boiler while maintaining long-term efficiency and reliability. Built on Worcester Bosch's award-winning Greenstar platform, the Greenstar 4000 combines outstanding performance with ultra-quiet operation and intelligent energy-saving technology.

Featuring a durable stainless steel heat exchanger, QuickTap® hot water technology, a modern full-colour display, and compatibility with EasyControl smart heating controls, the Greenstar 4000 offers an excellent balance of efficiency, comfort, and ease of use. Its compact cupboard-fit design makes it suitable for a wide range of installation locations without compromising performance.

Key Features

• 30kW Natural Gas Combination (Combi) Boiler
• 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
• Super quiet operation
• Quiet Mark certified
• QuickTap® hot water pre-heat function
• Stainless steel primary heat exchanger
• Full-colour LCD display
• Compatible with Worcester Bosch EasyControl
• Intelligent boiler modulation (up to 1:10)
• Compact cupboard-fit design
• 10-Year manufacturer's warranty (subject to installation by a Worcester Accredited Installer and registration terms)

Ideal for Medium to Larger Homes

The Worcester Bosch 4000 30kW Combi Boiler is ideal for medium to larger homes with one or two bathrooms. It delivers both central heating and domestic hot water directly from the mains, eliminating the need for a separate hot water cylinder while providing reliable hot water for everyday household use.

The included 15mm Scale Reducer helps reduce limescale formation, making this package particularly suitable for homes located in hard water areas.

Powerful Heating & Instant Hot Water

Delivering 30kW domestic hot water output and a 12.3 litres per minute flow rate (Δ35°C), the Greenstar 4000 provides fast, consistent hot water for showers, baths, and taps while maintaining efficient central heating throughout the property.

Its innovative QuickTap® technology pre-heats the plate heat exchanger, reducing waiting time for hot water and helping minimise water wastage without sacrificing comfort.

Compact Design

Despite its higher output, the Greenstar 4000 retains a compact design that fits neatly inside a standard kitchen cupboard, making it suitable for modern homes where space is limited.

Dimensions

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

The included 15mm Scale Reducer provides additional protection against limescale, helping maintain optimum boiler performance and reduce long-term maintenance requirements.

Advanced Energy Efficiency

Rated ErP A for both heating and hot water efficiency, the Greenstar 4000 delivers up to 94% efficiency, helping reduce gas consumption and lower household energy bills.

Its intelligent condensing technology and advanced modulation enable the boiler to operate efficiently across varying heating demands, providing excellent seasonal performance and improved comfort.

Smart Heating Control Compatibility

The Greenstar 4000 is fully compatible with Worcester Bosch EasyControl, enabling homeowners to control heating remotely, create personalised schedules, and maximise energy efficiency through intelligent temperature management.

Reliable Performance & Easy Maintenance

Designed with Worcester Bosch's renowned engineering quality, the Greenstar 4000 features a stainless steel heat exchanger, installer-friendly internal layout, and a modern full-colour interface for simple operation and diagnostics.

Its Quiet Mark certification makes it one of the quietest boilers in its class, making it particularly suitable for installation in kitchens, utility rooms, and open-plan living spaces.

Warranty & Peace of Mind

The Worcester Bosch 4000 30kW Combi Boiler with 15mm Scale Reducer includes a 10-Year manufacturer's warranty when installed with a Worcester Bosch system filter by a Worcester Accredited Installer and registered in accordance with the manufacturer's warranty terms.

Why Choose the Worcester Bosch 4000 30kW Combi Boiler with 15mm Scale Reducer?

• Premium boiler and scale protection package
• Powerful 30kW combi boiler
• Natural Gas compatible
• 12.3 L/min domestic hot water flow rate
• Includes 15mm Scale Reducer
• Quiet Mark certified
• QuickTap® hot water technology
• EasyControl compatible
• Compact cupboard-fit design
• 10-Year manufacturer's warranty