Worcester-Bosch Greenstar 4000
The Worcester Bosch Greenstar 4000 is the brand's highly acclaimed mid-range model, designed to replace the best-selling Greenstar I. This versatile boiler is available in both combi and system variants, catering to various heating needs. Notably, it comes with a robust 10-year warranty, ensuring long-term reliability and peace of mind for homeowners.
About the Worcester Bosch Greenstar 4000
Worcester-Bosch is the UK's leading boiler and heating manufacturer and the only brand to achieve the Which? Best Buy Award for 12 years running.
The Worcester Bosch Greenstar 4000 series is one of the brand's latest innovations, replacing their best-ever-selling boiler, theGreenstar i.
Designed to sit between the 2000 and 8000 series boilers, the 4000 is the brand's mid-range boiler offering.
The 4000 is available as a combi or system boiler and is offered in multiple sizes including 25kW and 30kW, with an impressive 10-year guarantee for parts and labour.
How much does the Worcester Bosch Greenstar 4000 cost?
For a standalone Worcester Bosch 4000 boiler, prices can range from £700 - £2,000 and are available in a wide range of sizes. However, it's worth bearing in mind that these prices don't include Gas-safe installation or any additional labour.
With a Gas-Safe installation, you'll be looking at £2,050 - £3,900. And, at Heatable, we can fit your Worcester Bosch boiler in as little as 24 hours.
How much can a Worcester Bosch 4000 save you?
This will depend on the efficiency of your current boiler and the new boiler you're searching for, but a Worcester Bosch boiler could save you as much as £540 per year if you upgrade from an old G-rated boiler to a modern A-boiler.
Which sizes is the Worcester Bosch Greenstar 4000 available in?
The Greenstar 4000 combi boiler range is available in 25kW and 30kW outputs.
The 25kW combi boiler has a heat output of 25kW and a flow rate of 10.5 l/min, making it suitable for small properties and flats that may have limited hot water demands.
The 30kW has an additional 5kW of power and a flow rate of 12.3 l/min making it suitable for medium-sized properties with higher hot water demands.
Why get your Worcester Bosch boiler installed with Heatable?
Upgrading your home with a brand-new boiler from Heatable isn't just a significant improvement; it's a choice that comes with myriad benefits. When you choose us for your installation, you're choosing quality assured by our Gas Safe certified installation team.
Additionally, we back our workmanship with a comprehensive 24-month installation warranty.
Our commitment to excellence extends beyond installation. We pride ourselves on providing exceptional aftercare and support. This dedication to quality service is why we became the first boiler industry member to be recognised as a Which? Trusted Trader. It's also the reason behind our thousands of 5-star reviews on the independent review platform, Trustpilot.
How long should a Worcester Bosch boiler last?
Worcester Bosch boilers are designed to have a lifespan of around 10 to 15 years, but there's no reason they can't last longer if they are serviced and maintained.
How long is a Worcester Bosch 4000 guarantee?
For the Worcester Bosch Greenstar 4000, the guarantee is 10 years.
Which Worcester Bosch boiler do you need?
The precise model that is right for you will depend on your specific goals and budget. If you would like us to recommend a variety of boilers that would be suitable for your home, use our free tool by clicking the button below.
Top features include
- Which? Best Buy award winners for over 10 years
- Impeccable care under the 'Worcester guarantee'
- Designed with quiet operation in mind
Worcester-Bosch Greenstar 4000 Deals
Worcester-Bosch Greenstar 4000
The UK's best selling combi boiler just got better.
Crammed with the latest energy tech and a gorgeous facelift. Choose the 4000 for max bill savings in your 2-4 bedroom home, whilst it looks damn good doing it.
- Perfect for small-medium sized homes
- 10 year product warranty
- Includes wireless controls, magnetic filter and flush
Replacement boilers,redefined.
All-inclusive boiler installations
New boiler
Installation
Controls¹
Pipework
Flush
Flue
Filter
Recycling
Aftercare
We've been Which? Trusted boiler installers for 3 years running.
2023 • 2024 • 2025
Get a new boiler with up-to 4 years
APR²
APR²Next day boiler installations
If ordered before 3pm
Which? Trusted Traders. The first and only online boiler installation business to become a Which? Trusted Trader.
All-inclusive aftercare. Each and every installation gets our exclusive 12 month workmanship warranty.
5 star reviews. Across Trustpilot, Google and Reviews.io, we've got over 10,000 5 star reviews with an average rating of 4.9.
A safe choice. We're Gas Safe registered for boiler installations, and MCS certified for solar installations.
Boiler FAQ's
We install a whole range of new boilers, from leading UK brands.
Our most popular being Worcester Bosch boilers, which come fully installed with up-to 10 year guarantee protection. Prices start from £2,195 (for a combi boiler installation).
Vaillant closely follows, with boilers like the ecoTEC Plus being our most popular premium offering.
It depends on the type of boiler installation which you're getting.
On a new combi boiler installation, as standard, you'll get the boiler, all required flue accessories, a system flush, new Boiler Plus compliant controls, a magnetic boiler filter and any extras, such as a gas pipe upgrades and/or condensate pipe upgrades.
On a new regular/system boiler installation, as above, you'll get the boiler, flue accessories, flush, a magnetic boiler filter, gas and condense upgrades and we'll reconnect to your existing boiler controls and cylinder.
We also offer upgrades, such as smart thermostats to remotely control your new boiler, improved flushing options and more.
Simply put, after your new boiler has been installed, you don't need to do anything.
Our team will register your new boiler's warranty directly with the manufacturer and we'll also register it with Gas Safe so they're aware of the new appliance. The only thing you'll need to do is get your new boiler serviced annually (this is important to keep it running well, but, most importantly, to maintain it's warranty).
On average installing a new boiler takes between 1 to 2 days to complete.
If you are having your old boiler replaced in the same location and with the same type of boiler the process will be quicker (likely one day) compared to installing a different type of boiler in a new location.
So, to summarise:
Straight forward boiler replacement:
Takes 1 day
A boiler replacement, including a relocation:
Takes 1-2 days
A conversion from a regular to a combi:
Takes 1-2 days
Yes, we can certainly try to.
For our new boiler installations, Heatable works with a panel of lenders when offering boiler finance, so, if for whatever reason you didn't pass with our primary lender, we will pass it over to a secondary who will be able to assist.
Failing that, we have a range of other payment options available such as payment via credit card, Klarna, and more.
First, you'll go through some online questions to ascertain what type of boiler installation you require, and match you to suitable products.
Next, you'll choose a new boiler which suits your budget (prices start from £1,795).
Then, you'll choose whether to spread the cost of your new boiler with finance or pay using your card.
Once you've booked, you'll upload some images of your existing setup to make sure we order the correct materials, and to avoid delays on the day of your installation.
Once installed, we'll register your new boiler's warranty and sort all of the paperwork.
Yes, you can. All of our installations have finance options available.
You can spread the cost over 3, 5, or 10 years at a rate of 9.9% APR. Or, you can spread the cost with 0% APR up-to 4 years on certain packages.
Buy Now Pay Later boiler finance is also available.
The cost of a new boiler depends on a variety of factors, including the type of boiler you select, your location and the complexity of your installation.
But, the typical costs for installing a boiler are:
Combi boiler replacement:
£1,800 - £2,800
Regular boiler replacement:
£2,000 - £2,800
System boiler replacement:
£2,000 - £2,800
Conversion (regular to combi):
£2,600 - £3,500
This largely depends on the efficiency of your current boiler and how much energy you use. For example, you could save as much as £840 per year if you are upgrading from an old G-rated boiler to a modern A-rated boiler (along with a programmer, room thermostat and thermostatic radiator controls (TRV's)).
For more details, check the Energy Savings Trust website.