This combi boiler is designed to transform home heating with its exceptional quiet operation and optimised efficiency. Building on the success of the Greenstar i range, this latest model seamlessly combines a modern appearance with enhanced performance features, making it perfect for contemporary homes.

The boiler promises not only effortless installation and maintenance but also a user-friendly experience with its intuitive full-text colour display. Compatible with RF controls, it offers improved convenience and ease of use, ensuring that managing your home’s heating has never been simpler. Engineered to deliver outstanding performance, the boiler features a wide modulation range and innovative gas consumption technology, making it ideal for reducing energy usage while maintaining optimal comfort. It's easy to replace older models with this unit, and its design facilitates straightforward servicing with front access. To provide homeowners with added assurance, the boiler comes with a standard 7-year guarantee, which can be extended to 10 years when a Greenstar System Filter is used.

Product Details:

  • Output: 30kW for efficient home heating
  • Pre-piping jig included for easy installation
  • Super quiet operation for noise-sensitive areas
  • Full-text colour display for intuitive control
  • RF control compatibility for enhanced convenience
  • Front access simplifies servicing and maintenance
  • Wide modulation range reduces gas consumption
  • Max DHW flow rate: 12.3l/min
  • Dimensions: H724mm x W400mm x D310mm
  • Guarantees from 7 to 10 years (Terms and conditions apply)

Additional Information:

  • Delivery service only to mainland UK. Some post codes excluded.

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

Boiler Specification
Brand Worcester Bosch
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Worcester Bosch Greenstar 4000 Natural Gas Combi Boiler (30kW)

  • $2,115.25
  • (FREE UK Delivery)
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Thursday 15th October? Order within 2 days, 12 hours, 51 minutes