Worcester Greenstar 25Si ErP LPG Combi Boiler
The Worcester Greenstar 25Si ErP LPG Combi Boiler is a compact and efficient heating solution, designed for small to medium-sized homes with one bathroom. Running on LPG (liquefied petroleum gas), it’s ideal for properties without access to mains gas while still providing Worcester Bosch’s renowned reliability and performance.
This model combines heating and hot water in one space-saving unit, making it perfect for homes with limited storage. With its 94% efficiency rating and ErP A-rated performance for both heating and hot water, the Greenstar 25Si delivers comfort and energy savings all year round.
Efficient and Compact Design
With a central heating output of 24kW and a hot water output of 25kW, the Greenstar 25Si LPG Combi is powerful enough to heat homes with up to 10 radiators while providing a steady domestic hot water flow rate of 10.2 litres per minute.
Despite this strong performance, its compact dimensions — just 690mm (H) x 390mm (W) x 280mm (D) — mean it fits neatly inside a standard kitchen cupboard, offering a discreet installation that saves valuable space.
Reliable and Easy to Use
The Greenstar 25Si LPG is built to Worcester Bosch’s exacting standards, ensuring long-term reliability and durability. It includes boiler frost protection to safeguard your system during cold weather, user-friendly controls for simple operation, and a low energy pump designed to reduce electricity consumption.
With a potential warranty of up to 10 years (subject to terms and conditions), this model offers excellent peace of mind for homeowners looking for both performance and longevity.
Environmentally Friendly Efficiency
The Worcester Greenstar 25Si features condensing technology to maximise heat recovery from exhaust gases, ensuring minimal energy waste. Its ErP A-rating for heating and hot water guarantees top-tier efficiency, helping you reduce both fuel bills and carbon emissions — a smart choice for cost-conscious and eco-aware homeowners alike.
Key Features & Benefits
Fuel Type: LPG (Liquefied Petroleum Gas)
Efficiency: 94% (A-rated ErP efficiency)
Heating Output: 24 kW
Hot Water Output: 25 kW
Flow Rate: 10.2 L/min @ 35°C rise
Compact dimensions: 690 x 390 x 280 mm
Wall-mounted design – ideal for smaller spaces
Built-in frost protection for year-round reliability
Low energy pump – reduces power consumption
User-friendly controls for simple operation
Condensing technology for higher efficiency
Warranty: Up to 10 years (subject to T&Cs)
Technical Specifications
Manufacturer: Worcester Bosch
Model: Greenstar 25Si ErP LPG Combi
Boiler Type: Combination (Combi)
Fuel Type: LPG
Condensing: Yes
CH Output: 24 kW
DHW Output: 25 kW
Flow Rate: 10.2L/min @ 35°C rise
Efficiency Rating: 94%
ErP Rating: A (Heating) / A (Hot Water)
Mounting: Wall-mounted
Dimensions (HxWxD): 690 x 390 x 280 mm
Standard Warranty: Up to 10 years
FAQs
1. What type of property is the Worcester Greenstar 25Si LPG Combi best suited for?
This boiler is ideal for **small to medium-sized homes** with **one bathroom** and up to **10 radiators**. It’s perfect for properties off the mains gas grid that still want efficient, on-demand heating and hot water.
2. Can this boiler fit inside a kitchen cupboard?
Yes! The Greenstar 25Si has **compact dimensions (690 x 390 x 280 mm)**, making it small enough to fit neatly within a **standard kitchen cupboard** — ideal for saving space.
3. How efficient is the Worcester Greenstar 25Si LPG model?
This model offers **94% efficiency** and is **A-rated for both heating and hot water** under the ErP directive, helping you reduce your **energy consumption** and **heating bills**.
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