WORC GS 25SI ERP COMP COMBI NG BLR 050

The Worcester Bosch Greenstar 25Si ErP Compact Combi (Natural Gas) is a high-efficiency, wall-hung condensing boiler designed to provide reliable central heating and instantaneous domestic hot water without the need for a separate cylinder. Its compact case makes it a smart choice for smaller properties or tight installation spaces, while ErP A-rated performance helps reduce energy use and running costs. Manufactured by Bosch Thermotechnology Ltd (Worcester Bosch), this model delivers dependable everyday comfort with low emissions and quiet operation.

• Manufacturer: Bosch Thermotechnology Ltd (Worcester Bosch)
• Model: Greenstar 25Si ErP Compact Combi (Natural Gas)
• Description code: WORC GS 25SI ERP COMP COMBI NG BLR 050
• Manufacturer reference: 774429
• Fuel: Natural Gas
• Type: Condensing combination boiler (heating + hot water on demand)
• ErP efficiency class: A-rated (heating and hot water)
• Compact, cupboard-friendly design for flexible siting
• Instantaneous domestic hot water; no hot water cylinder required
• Low NOx, ErP-compliant performance
• Quiet operation and high reliability from the Worcester Bosch Greenstar range
• Compatible with Worcester Bosch flue systems and controls
• Built-in frost protection for lofts or unheated areas
• Suitable for apartments and small to medium homes with one bathroom
• Wall-mounted installation; professional Gas Safe installation required