The Worcester Bosch Greenstar 4000 15kW System Gas Boiler is a compact, efficient heating solution designed for small to medium-sized homes with a hot water storage cylinder. As the direct successor to the Greenstar 15Ri, it combines reliable Worcester Bosch performance with a modern design, easy controls and quiet operation.
With an ErP A rating and a wide modulation range, the Greenstar 4000 can adapt its output to heating demand, helping to optimise energy use and reduce unnecessary gas consumption. Its modern full-colour text display provides clear and straightforward control, while its exceptionally quiet operation makes it well suited to homes where low noise is important.
The Greenstar 4000 15kW System Boiler is designed for heating systems that use a separate hot water storage cylinder, making it a practical choice for properties where stored hot water is preferred. It also supports wireless connectivity with Bosch EasyControl, providing additional flexibility when managing your home’s heating.
For renewable heating setups, the boiler can also be used alongside Greenskies solar panels, helping homeowners explore opportunities to improve energy efficiency and reduce running costs.
Key Features:
15kW Worcester Bosch Greenstar 4000 system gas boiler
Product code: 7733600379
ErP A-rated efficiency
Suitable for small to medium-sized homes
Designed for systems with a hot water storage cylinder
Wide modulation range helps optimise gas consumption
Modern compact design
Easy-to-use full-colour text display
Exceptionally quiet system boiler operation
Wireless connectivity with Bosch EasyControl
Compatible with Greenskies solar panels
Direct upgrade for the Worcester Bosch Greenstar 15Ri
Warranty Options:
An extended 8-year manufacturer’s warranty is available when the boiler is installed with a Greenstar System Filter, subject to the manufacturer’s terms and conditions.
A 10-year manufacturer’s warranty may be available when installed by a qualifying Worcester Accredited Installer who is an Excelerate member and uses a Greenstar System Filter. Eligibility and manufacturer’s terms apply.