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Worcester Greenstar 4000 System Range
- Gas
- System Boiler
Quiet Mark Certified – Enjoy powerful home heating without the unwanted noise.
Modern & Stylish – Sleek design that complements contemporary interiors.
User-Friendly Controls – Intuitive colour display for effortless monitoring and adjustments.
Energy Efficient (A-Rated) – Delivers top performance while helping reduce energy bills.
30 kW Output – strong performance for medium to large homes.
12.3 l/min Hot Water Flow Rate – enjoy a consistent supply of hot water.
A-Rated ERP – high efficiency for lower bills and eco-friendly heating.
94% Energy Efficiency – designed to save energy without compromising comfort.
10-Year Guarantee – enjoy complete peace of mind with long-lasting reliability
Manufactured in the UK – quality you can trust, built to British standards
FREE Wireless Controls – effortless heating control at your fingertips
High Performance & Maximum Efficiency – keep your home warm while saving energy
Precision Heating to Reduce Fuel Bills – smart technology for cost-effective comfort
Perfect for Small to Medium Homes with One Bathroom – ideal for everyday use
Bosch-Engineered Quality at an Affordable Price – premium performance without the premium cost
Worcester Bosch Rated 4.7/5 on Trustpilot – trusted by thousands of happy customers
What’s Included with The Boiler Team Installation?
- Installed by a local Gas Safe engineer
- Old boiler & tanks removed (if applicable)
- All waste cleared, including the old boiler
- Flue installation for optimal performance
- Magnetic filter to protect your system
- System cleanse + protective treatments included
- Pipework upgrades were required
- Premium copper & fittings supplied
- Electrical setup, including wireless thermostat (if applicable)
- Delivery & setup arranged for you
- Warranty registration & certification handled
- Manufacturer parts & labour warranty included
- 10-Year workmanship guarantee from The Boiler Team
Frequently Asked Questions About Worcester Bosch
Find answers about Worcester Bosch boilers, including combi, system, and conventional models for gas or oil. Get the key info you need to choose the right boiler for your home.
- Central Heating (CH) Output: 24kW
- Domestic Hot Water (DHW) Output: 25kW
This model is ideal for small to medium-sized homes with up to 10 radiators and a single bathroom. For larger properties or higher hot water demands, consider the 30kW variant.
The Greenstar 4000 25kW boasts a 94% efficiency rating and an ErP A-rating for both heating and hot water.
The boiler measures 724mm in height, 400mm in width, and 310mm in depth, making it compact and suitable for various installation spaces.
It includes a standard 7-year warranty, which can be extended to 8 years when installed with a Worcester filter.
Yes, the boiler is compatible with smart thermostats, including Worcester Bosch's EasyControl and third-party options like Google Nest, allowing for remote management
It features an Intelligent Filling System that automatically maintains optimal system pressure, notifying users if manual intervention is needed
Yes, this model is capable of running on a 20% hydrogen blend, making it future-proof for evolving energy standards.
While the Greenstar 4000 offers excellent efficiency and reliability, some competitors, like Viessmann, use stainless steel heat exchangers and brass components, which may offer longer-term durability.
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