Worcester Bosch 4000 25kW Combi Boiler

Worcester Greenstar 4000 25kW Combi Boiler

Price: £1,541.00

The Worcester Bosch Greenstar 4000 25kW combi boiler is a high performance and efficient combi boiler for medium-sized homes. It’s a sought-after choice for those looking to upgrade their heating system.

  • Heat output: 25kW
  • 20% Hydrogen-mix Ready
  • Aluminium Silicon Heat Exchanger

(Boiler-only price: comparing five or more suppliers, including Screwfix and Plumbase. Correct February 2024).

The Worcester Bosch Greenstar 4000 25kW combi boiler is a 94% efficient wall-mounted gas and LPG condensing boiler. This is a premium Worcester Bosch’s combi boiler.

Key Features

  • Compact dimensions – install in a cupboard or kitchen
  • Modulation of 1:10 – makes this boiler extremely efficient
  • 94% / A-rated efficiency
  • Maximum 10-year warranty
  • Can heat even larger homes with two bathrooms
  • Push-button LCD
  • Smart energy system technology included with Bosch EasyControl

Size and Installation

  • 25kW Gas & LPG condensing boiler (LPG version available)
  • Dimensions – 724mm high, 400mm wide and 310mm deep
  • Quiet operation means it doesn’t need to be in a cupboard


  • Front-mounted screen and controls
  • User-friendly

Environmentally Friendly

  • Low CO2 emissions for reduced environmental impact
  • 20% hydrogen blend ready
  • 1:8 modulation enables efficient running at 10% of maximum power
Get Your FREE Online Quote Today!
Save up to £590 PER YEAR on your heating bills.
Quote in 30 seconds. No obligation. Next Day installation.
Save up to £590 PER YEAR!