Worcester Bosch Greenstar 4000 25kW Combi Boiler LPG

Product Description

The Worcester Bosch Greenstar 4000 25kW LPG Combi Boiler is a high-performance, energy-efficient solution designed for homes without access to mains gas. Combining heating and hot water in one compact unit, this combi boiler delivers reliable performance with a sleek, modern design.

Engineered for efficiency, it features a wide modulation range (down to 3kW), ensuring optimal energy use even at low demand. The intuitive full-colour display makes operation simple, while the quiet running noise (as low as 42 dB) ensures minimal disruption in the home.

With flexible installation options, extended flue lengths, and compatibility with Worcester’s intelligent filling system, this boiler offers both installer convenience and user-friendly functionality. It also benefits from eco-conscious packaging and advanced design features for modern homes.

Why Customers Should Buy This Product

• All-in-one combi system for heating and hot water
• 25kW output ideal for small to medium-sized homes
• LPG compatible for off-grid properties
• A-rated efficiency reduces energy costs
• Wide modulation (down to 3kW) improves efficiency at low demand
• Ultra-quiet operation (from 42 dB)
• Full-colour intuitive display for easy control
• Flexible installation with long flue options
• Compatible with intelligent filling system
• Up to 8-year warranty with system filter
• Trusted quality from Worcester Bosch

Key Specifications

• Brand: Worcester Bosch
• Range: Greenstar 4000
• Product Type: Combi Boiler
• Output: 25kW
• Fuel Type: LPG
• ERP Rating: A
• NOx Class: Class 5
• Mounting Type: Wall Mounted

Dimensions:

• Height: 724 mm
• Width: 400 mm
• Depth: 300 mm

Performance:

• Heat Output: 25 kW
• BTU Output: 77,607 BTU
• CH Condensing Max Output: 24.7 kW
• Hot Water Flow Rate (ΔT 35°C): 10.2 litres/min
• DHW Output Range: 3 – 24 kW
• Noise Level: 42–45 dB

Flue Options:

• Max Vertical (125mm): 21 m
• Max Vertical (100mm): 12 m
• Max Horizontal (125mm): 21 m
• Max Horizontal (100mm): 12 m

Features:

• Full-colour LCD display
• Wide modulation ratio (1:10)
• Integrated condensate siphon (500ml)
• Compatible with Greenstar intelligent filling system
• Solar compatible
• Eco-friendly packaging

Warranty:

• Standard: 7 Years
• Extended: Up to 8 Years (with Greenstar system filter)

Installation & Compatibility

• Suitable for LPG fuel systems (off-grid homes)
• Ideal for replacing existing combi boilers
• Compatible with Worcester Bosch controls and accessories

What’s in the Box

• 1 x LPG Combi Boiler Unit
• Installation Instructions

Important Information

• LPG boiler – requires LPG supply (tank or cylinders)
• No separate hot water cylinder required
• Flue and accessories may be required depending on installation