Worcester Bosch Greenstar 4000 System Boiler 12–24kW

The Greenstar 4000 system boiler heats the radiators directly and supplies a separate hot water cylinder, with the pump and expansion vessel built in. Natural gas, 12kW to 24kW. The 18kW is new, boxed stock in our Lincoln warehouse; other outputs are supplied to order.

Key points

• 12, 15, 18, 21 and 24kW, natural gas
• 724 x 400 x 310mm (H x W x D)
• Quiet Mark certified; colour display
• ErP A
• EasyControl compatible; add the internal diverter valve kit for a cylinder

What's included

• 1 x Worcester Bosch Greenstar 4000 system boiler in the output you select, boiler only, as supplied by the manufacturer
• Wall-mounting jig, as supplied by Worcester Bosch
• No flue included: choose your flue kit with the selector above Add to cart

Specification and price

Dimensions (H x W x D): 724 x 400 x 310mm. ErP A.

Recommended add-ons

Tick these in the add-on list above Add to cart, or follow the links:

• Worcester Bosch Greenstar magnetic system filter: protects the heat exchanger and is part of Worcester's extended guarantee terms.
• Worcester Bosch EasyControl CT200 smart thermostat: app, voice and presence-based control.
• Worcester Bosch Greenstar 4000 system diverter valve kit: internal diverter for a hot water cylinder.
• Worcester Bosch Greenstar vertical pre-piping kit: pre-formed vertical pipework behind the boiler (choose the 4000 / Compact version).
• Worcester Bosch 60/100 90° flue bend: for side exits and changes of direction.
• Worcester Bosch 45° flue bends (pair): offsets around obstacles.

Delivery and collection

Delivered by pallet/courier (£29.99 per order) or collect free from Leafbridge, Lincoln. Order-in boilers usually 2-4 working days.

Worcester Bosch's Greenstar 4000 System 18kW ErP data sheet, Greenstar 4000 System 12kW ErP data sheet, Greenstar 4000 System 21kW ErP data sheet are in the PDF downloads at the bottom of this page.