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A white Worcester Bosch Greenstar 4000 21kW system gas boiler on a green gradient background with yellow circles stating “Fully Fitted” and “£0 Deposit.”.

Worcester Bosch Greenstar 4000 21kW System Gas Boiler

£2,850.00

High-performance system boiler for medium homes, with robust efficiency.

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10 in stock

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The Worcester Bosch Greenstar 4000 21kW System Gas Boiler is a condensing system boiler for medium homes with up to 14 radiators and 1-2 bathrooms, requiring a cylinder. It provides a 21kW output and a 94% efficiency rating (ErP A-rated). Measuring 710x400x330mm and weighing 33kg, it’s cupboard-friendly. It includes a 1:10 modulation ratio, a stainless steel heat exchanger, and EasyControl. It supports natural gas and offers a 7-year warranty, extendable to 10 years with a filter and Excelerate installer. Ideal for larger medium homes.

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Specification
Power Output (Heating)21 kW
Power Output (Hot Water)Dependent on Cylinder
Boiler Depth310 mm
Boiler Height710 mm
Boiler Width400 mm
Weight31 kg
BrandWorcester Bosch
ColourWhite
Boiler TypeSystem
Fuel TypeNatural Gas or LPG
Heat Exchanger MaterialAluminium Silicon
Energy Efficiency RatingA (ErP)
Display TypeFull-Colour Text Display
Fitting RequirementsMust be Fitted by Gas Safe Registered Engineer
Mounting System SuppliedWall-Mounting Bracket Supplied
Indoor/Outdoor UsageIndoor
Connector TypeStandard Hydraulic Connections
Manufacturer Guarantee7 Year Warranty (Extendable to 10 Years with Worcester Accredited Installer and Greenstar System Filter)
Model Name/NoGreenstar 4000 GR4300iW 21 S NG
Pack Size1
Parent ColourWhite
Pieces in Pack/Case1 Boiler
Product TypeGas System Boiler
Range NameGreenstar 4000
Flue LengthUp to 12 m (60/100 mm)
Modulation Range1:10
Noise Level45 dB(A)
Annual Energy Consumption94% Efficiency (Estimated)
Temperature CoefficientNot Applicable
CertificationsErP A-Rated, Gas Safe Compliant, 20% Hydrogen Blend Ready

Availability: In Stock

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