Compact and user-friendly, the Worcester Bosch Greenstar 4000 Combi is one of the quietest boilers on the market.
The Worcester Bosch Greenstar 4000 Combi replaces the best-selling Greenstar i boiler and has a host of new features and a wide power range to meet your heating and hot water needs. In addition to being quieter and more compact than its predecessor, the Greenstar 4000 Combi features a modern new design, an innovative Quick Tap water-saving function and wireless connectivity with the Bosch EasyControl.
How Much Does this Boiler Cost?
Available with outputs of 25kW and 30kW, the Worcester Bosch Greenstar 4000 Combi will cost you anything between £985 and £1,050. You also need to pay a Gas Safe registered engineer to install this combi boiler, and costs vary based on the installer, the size of your home and how much work is involved. If you want to find the best price for the boiler plus installation, you should request a fixed-price quote from different local and national installers.
How will I know if this Boiler is Suitable for My Home?
Worcester Bosch’s Greenstar 4000 Combi is ideal for small and medium-sized homes where space is limited and, like all combi boilers, doesn’t require a separate cylinder or loft tanks. Small enough to fit inside a kitchen cupboard, this combi boiler heats water directly from the mains when you turn on a tap to ensure instantaneous hot water is always available and is best suited to homes with one bathroom.
Always ask a qualified heating engineer what size boiler will match your needs, and make sure you choose a Gas Safe registered engineer to install it.
Is it a High Efficiency Boiler?
Yep. The Worcester Bosch Greenstar 4000 Combi is an A-rated combination boiler and achieves an ErP efficiency rating of 94%, meaning it can help to lower your carbon footprint and heating bills.
Does this Boiler have a Good Range of Controls and Features?
It has some fantastic controls and features, including an LCD display panel with push-button controls and an innovative Quick Tap function that helps you reduce water waste with the quick open and close of your hot tap. This combi boiler operates well in low water pressure areas and is Quiet Mark certified, making it one of the quietest boilers your money can buy. It even comes in 100% planet-friendly packaging and features wireless connectivity with the Bosch EasyControl smart thermostat that allows you to control and monitor your heating and hot water from your smartphone or tablet.
How long is the Warranty on this Boiler?
The Worcester Bosch Greenstar 4000 Combi boiler comes with a 5-year warranty as standard. However, you’ll receive a 10-year guarantee if you choose a Worcester Bosch Accredited Installer to install this combi boiler.
Summary of Important Information
- Expect to pay between £985 and £1,050
- Heating output of 25kW or 30kW
- Hot water flow rates of 9 or 10.8 litres per minute
- Dimensions of 724mm (H) x 400mm (W) x 310mm (D)
- Uses gas as its fuel source
- A-rated for efficiency
- Smart compatible
- 5-year warranty as standard
Pros and Cons
This combi boiler from Worcester Bosch isn’t the cheapest boiler on the market, but it comes with some top of the range features and boasts excellent build quality and high efficiency. Below, you can find the pros and cons of getting the Greenstar 4000 Combi boiler installed.
- Awarded Which? Best Buy
- Worcester Bosch has a Which? brand score of 84% – correct at the time of writing – January 2022
- Suited to small and medium-sized homes with one bathroom
- Easy-to-use push-button LCD display
- Quick Tap water-saving function – helps you reduce water waste
- One of Worcester Bosch’s quietest boilers to date
- Operates well in low water pressure areas
- 100% planet-friendly packaging
- No need for separate cylinder or loft tanks
- Compatible with Bosch EasyControl – can tailor hot water times and heating temperatures from your smartphone or tablet, even when you’re not at home
- Provides maximum energy efficiency – reduce fuel bills and carbon emissions
- Excellent rating on Trustpilot – correct at the time of writing – January 2022
- 5-year warranty – but this can be extended to 10 years
Get quotes to supply a new Worcester boiler now
Things you need to know:
 British Gas acts as a credit broker, not the lender and offers products from a panel of lenders. Payment options are subject to change without notice. British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply.
 £100 additional discount is only available to British Gas energy and British Gas HomeCare 1-4 customers who choose to have a British Gas installation. This offer is available to homeowners and landlords with a total system output of up to 50kW who already have a British Gas energy tariff or HomeCare 1-4 at the property where the boiler would be installed. Available to 98% of UK mainland households. This offer cannot be used by tenants, British Gas multi–premise landlord customers and cannot be used in conjunction with staff/ex-staff/partner discounts. Terms and Exclusions apply. Offers are subject to change without notice.
 Saving when upgrading from a G-rated boiler to an A-rated boiler in a detached home using the average energy bill for a high usage house. Source: http://www.energysavingtrust.org.uk/home-energy-efficiency/boiler-replacement and https://www.britishgas.co.uk/energy/guides/average-bill.html
British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply. Saving when upgrading from a G-rated boiler. Source: http://www.energysavingtrust.org.uk/home-energy-efficiency/boiler-replacement