Worcester Greenstar 4000 21kW LPG System Boiler
The Worcester Greenstar 4000 21kW LPG System Boiler is an excellent choice for medium to large-sized homes that rely on a stored hot water cylinder. Designed for flexibility and strong performance, it provides reliable heating while keeping running costs low. Its LPG compatibility also makes it ideal for properties that are not connected to the mains gas network.
Compact and lightweight, this boiler is easy to install in a variety of locations, even where space is limited. It comes with a built-in pump and expansion vessel, helping installers achieve a neat, efficient setup. Homeowners can further personalise their system with a wide selection of optional controls, including smart thermostats for increased comfort and energy savings.
Key Features
LPG-compatible system boiler for off-grid homes
Compact dimensions for easy installation
Built-in pump and expansion vessel for a cleaner layout
Optional plug-in diverter valve
Compatible with a wide range of optional heating controls
Technical Information
Manufacturer: Worcester Bosch
Model: 4000
MPN: 7733600384
SKU: 79147
GTIN: 4057749856739
Product Type: LPG System Boiler
Performance:
CH Output: 21kW
CH Output (BTU): 71,000
ErP Heating Rating: A Rated for Heating
Dimensions:
Height: 724mm
Width: 400mm
Depth: 310mm
Weight:
Gross Weight: 33.2kg
Warranty:
7 Years (Subject to manufacturer T&Cs)
FAQs
Is the 21kW model suitable for larger homes?
Yes. The 21kW output makes it a strong match for **medium to large homes**, especially those with several radiators and a stored hot water cylinder.
Do I need a separate hot water tank with this boiler?
You do. As a **system boiler**, it works alongside a hot water cylinder, although it doesn’t require a cold water tank like a traditional regular boiler.
Can I use smart heating controls with this boiler?
Yes — the Greenstar 4000 range is compatible with a variety of **optional and smart controls**, allowing remote scheduling and improved energy efficiency.
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