Worcester Greenstar 4000 25kW Combi
The Worcester Greenstar 4000 25kW Combi Boiler is a high-efficiency, wall-mounted boiler designed for small to medium-sized homes with one bathroom. As the direct upgrade to the Greenstar 25i, it combines modern design, quiet operation, and advanced features to deliver reliable heating and instant hot water whenever you need it.
Efficient Heating and Hot Water
With a wide modulation range, the Greenstar 4000 optimises energy use even when heating demand is low, helping to reduce gas consumption and lower energy bills. Its instantaneous hot water ensures you always have a warm shower, even in areas with low water pressure. The boiler is ErP A-rated, delivering cost-effective and environmentally friendly heating.
Modern Design and User-Friendly Controls
This combi boiler features a full-colour long-text display that is intuitive and easy to use. Its sleek, compact design makes it ideal for small spaces, while being one of the quietest combi boilers available, operating at just 45 dB(A). Additional features include the innovative Quick Tap water-saving function, helping reduce water waste.
Easy Installation and Maintenance
The Greenstar 4000 25kW is designed for straightforward installation. It includes a pre-piping jig with rear piping as standard, a 500ml integrated condensate siphon, and offers long flue lengths up to 12m, providing flexibility in siting. This makes it particularly easy to replace older Worcester i system models.
Warranty and Peace of Mind
The boiler comes with a 7-year manufacturer’s guarantee, which can be extended to 8 years when installed with any Greenstar system filter, ensuring long-term reliability and peace of mind.
Technical Specifications
- **Brand:** Worcester Bosch - **Model:** Greenstar 4000 25kW Combi (7733600371) - **Boiler Type:** Wall-mounted Combi Boiler - **Heat Output:** 25 kW - **Fuel Type:** LPG / Natural Gas - **Efficiency:** ErP A-rated - **Noise Level:** 45 dB(A) - **Mounting:** Wall-mounted - **Flow Rate:** Instantaneous hot water - **Warranty:** 7 years (extended to 8 years with any Greenstar system filter)
Frequently Asked Questions
Is the Greenstar 4000 25kW suitable for small to medium homes?
Yes, it is designed for properties with one bathroom, providing sufficient heating and hot water for small to medium-sized homes.
Can it be used with LPG?
Yes, this model is compatible with both LPG and natural gas.
Is it energy-efficient?
Yes, it has a **wide modulation range** and is **ErP A-rated**, reducing fuel consumption and lowering energy bills.
Does it operate quietly?
Yes, at just 45 dB(A), it is one of the quietest combi boilers available, making it suitable for installation in living areas or small spaces.
Does it come with a warranty?
Yes, it comes with a **7-year manufacturer’s guarantee**, extendable to **8 years** when installed with any Greenstar system filter.
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