Worcester Greenstar 4000 18KW System Boiler

Worcester Greenstar 4000 18kW System Boiler

The Worcester Greenstar 4000 18kW System Boiler is a reliable, energy-efficient choice for medium to large-sized homes, especially those using a stored hot water cylinder. Designed with modern households in mind, it offers excellent performance, quiet operation, and the flexibility to pair with a wide range of heating controls. Its compact and lightweight design makes installation straightforward, even in tighter spaces. With built-in components such as a pump and expansion vessel, it reduces installation time and creates a tidy, streamlined setup. Homeowners can also enhance comfort and efficiency by adding optional controls, including smart thermostats.

Key Features

Compact, space-saving boiler ideal for flexible installation Built-in pump and expansion vessel for a cleaner, faster setup Compatible with optional plug-in diverter valve Wide choice of optional heating controls Perfect for homes using a stored hot water cylinder

Technical Information

Manufacturer: Worcester Bosch Model: 4000 MPN: 7733600381 SKU: 79144 GTIN: 4057749856708 Product Type: Gas System Boiler Performance: CH Output: 18kW CH Output (BTU): 61,000 ErP Rating: A Rated for Heating Dimensions: Height: 724mm Width: 400mm Depth: 310mm Weight: Gross Weight: 33.2kg Warranty: 7 Years (Manufacturer T&Cs apply)

FAQs

Is this boiler suitable for larger homes?

Yes — the 18kW output makes it a strong fit for **medium to large homes**, especially properties with multiple radiators and a stored hot water cylinder.

Do I need a hot water tank with this system boiler?

Yes. As a **system boiler**, it works alongside a stored hot water cylinder, but it does not require a separate feed tank like a conventional boiler.

Can I use smart controls with this model?

Absolutely. The Greenstar 4000 range supports a variety of **optional and smart controls**, helping to improve comfort and boost energy efficiency.

Check out our other products here.

Explore more from our range here.