High-efficiency Worcester Bosch Greenstar 4000 combi boiler Provides reliable heating and hot water for small to medium UK homes Compact design with A-rated efficiency and Quiet Mark certification
Estimated Cost
Technical Specifications
Gas
Fuel Type
Yes
Solar Compatibility
25 kW
Central Heating Output
Available
ErP Data Sheet
A
ErP Efficiency Rating
724 × 400 × 310 mm
Dimensions (H×W×D)
Greenstar 4000 25kW Combi Boiler
Control Options: Bosch EasyControl smart thermostat for effortless app-based heating control
High Efficiency (A-rated)
Compact Utility Design
Wide Output Range
Renewable Ready
How it Works – Simple, Fast & Hassle-Free.
Answer a few quick questions about your home and energy needs.
Choose the perfect renewable solution from tailored options we recommend.
Expert installers ensure a fast, professional, and reliable setup.
What types of boilers does Worcester Bosch offer?
Worcester Bosch manufactures:
Combi Boilers – For instant hot water and heating, no tank required.
System Boilers – Require a cylinder for hot water storage.
Regular (Conventional) Boilers – Work with tanks and are ideal for older systems or larger properties.
How energy efficient are Worcester Bosch boilers?
Most modern Worcester boilers have an A-rated ErP efficiency (over 90%). This helps reduce energy bills and carbon footprint compared to older G-rated boilers.
How often should I service a Worcester Bosch boiler?
You should service your boiler once a year. Annual servicing ensures it runs safely, maintains efficiency, and keeps your manufacturer warranty valid.
How long do Worcester Bosch boilers last?
With regular servicing and maintenance, a Worcester boiler typically lasts 12–15 years. Some can last even longer if well maintained.