Worcester Bosch Greenstar boilers compared

Worcester Bosch is a household name in boilers, and there’s a reason why. They’ve been making boilers for over 70 years, earning a reputation for reliability, quality, and aftercare. 

With several years of Which? Best Buy awards under its belt and an average of 4.6 stars on Trustpilot, it’s clear that Worcester Bosch knows a thing or two about how to look after its customers.

According to uSwitch, the company has the lowest percentage of customer service issues compared to its rivals, including Ideal Heating and Vaillant.

If you’re considering investing in a Worcester Bosch boiler, you’re in good hands, but how do you know which model is right for your home? In this blog post, we look at the Greenstar range – we’ll compare the features, benefits, and costs of these popular boilers.  

Worcester Greenstar 2000 overview 

The Greenstar 2000 is Worcester Bosch’s entry-level boiler. Affordable and compact, it’s ideal for flats and small-to-medium-sized homes with one bathroom. 

Available in two power outputs – 25kW and 30kW, it’s the quietest combi boiler on offer from Worcester Bosch. This versatile boiler is small enough to fit between two kitchen cupboards and is A-rated for energy efficiency.  

It may be small, but it certainly packs a punch when it comes to features. It’s compatible with the Worcester Bosch smart controller (Bosch EasyControl) and shares some of the same innovative features as the high-end models in the Greenstar range. 

The ‘Quick-Tap’ function is a water-saving feature on Worcester Bosch boilers. It engages the boiler when you open and close the tap for guaranteed hot water thirty seconds later when you turn on the tap. 

Technical information for Greenstar 2000 

This boiler is a heating engineer’s dream. It has removable side panels and push-fit parts, so it’s easy to install. You can even get a seven-year warranty on the Greenstar 2000 if you meet the right conditions*.   

Here’s what you need to know at a glance.

  • Available in 25kW or 30kW power outputs 
  • A-rated (93%) for energy efficiency – water and space heating
  • 724mm x 400mm x 300mm (height x width x depth)
  • Fitted with the ‘Quick Tap’ function
  • EasyControl compatible

Who is the Greenstar 2000 suitable for?   

The Worcester Bosch Greenstar 2000 suits apartments and small-to-medium-sized properties with one bathroom. It’s also available as LPG (liquified petroleum gas), ideal for caravans, static homes, and holiday parks.

This sized boiler isn’t powerful enough for medium-to-large-sized homes with more than one bathroom and a high demand for hot water.  

Worcester Greenstar 4000 overview 

The 4000 is Worcester Bosch’s mid-range boiler in the Greenstar range. Its modern design has curved edges and a full-colour digital display. The boiler control display on Worcester Bosch boilers uses diagnostic codes, so if something goes wrong, it’s easier to determine what the problem is. 

Available in 25 kW and 30 kW, the Worcester Bosch Greenstar 4000 is ideal for small and medium-sized properties with one bathroom. Quiet and compact, this combi boiler can fit between two standard kitchen cupboards. 

The Greenstar 4000 is solar compatible and works with the Worcester Bosch EasyControl smartphone app, so you can control the timing and temperature of your home heating when you’re not there. 

Like the Greenstar 2000, this combi boiler is rated A for energy efficiency (ErP rating).  

Technical information for Greenstar 4000 

The Greenstar 4000 comes with a ten-year warranty* when fitted by an accredited Worcester Bosch installer, like Arton Heating.  

Here’s what you need to know at a glance.

  • Available in 25kW and 30kW power outputs 
  • A-rated (94%) for energy efficiency – water and space heating 
  • 724mm x 400mm x 310mm (height x width x depth) 
  • Fitted with the ‘Quick Tap’ function 
  • EasyControl compatible   

Who is the Worcester Greenstar 4000 for? 

The mid-range combi boiler in the Greenstar range suits small-to-medium properties with one bathroom. It’s also available in a model suitable for taking LPG, which can be used in caravans and static homes. 

If you’re fed up with rinsing off your shampoo under a drizzly shower, look no further. The Worcester 4000 works well in areas with low water pressure for hot and powerful showers. 

Worcester Bosch 8000 overview 

The Greenstar 8000 is Worcester Bosch’s most powerful wall-hung combi boiler. Replacing the award-winning Greenstar CDi Classic, it’s ideal for a large house with multiple bathrooms and a high demand for hot water. 

The Worcester 8000 Style is available in either high gloss black or white. Its modern, sleek design is complemented by an easy-to-use boiler display with push-fit buttons and wireless connectivity via the Bosch EasyControl app. 

Rated A for energy efficiency, this powerful combi boiler boasts increased efficiency. It also comes with the option of connecting to Worcester Bosch’s intelligent filling system. 

The unique system continually monitors the boiler’s pressure and automatically adjusts it without the need for you to do anything. 

Technical information for Worcester 8000 

The Worcester Bosch Greenstar 8000 has the longest manufacturer’s warranty of all combi boilers in this range. You can get up to a 12-year guarantee* when fitted by an accredited Worcester Bosch installer

Here’s what you need to know at a glance.

  • Available in 30kW, 35kW, 40kW, 45kW and 50kW 
  • A-rated (94%) for energy efficiency – water and space heating 
  • 780 x 440 x 365 (height x width x depth) 
  • EasyControl compatible 

Energy efficiency (as determined by the European standard – ErP) is a measure of how much of the energy used to power a boiler goes towards heating the water and how much is wasted.  

Who is the Worcester Greenstar 8000 suitable for? 

The 8000 is the most powerful of the Worcester Bosch combi boilers in the Greenstar range, suitable for medium to large houses. This boiler is ideal for people with multiple bathrooms and has a high demand for hot water or anyone who wants to take advantage of its premium features.

Greenstar boilers – 2000 vs 4000 vs 8000

The Greenstar 2000 is ideal for an affordable and compact entry-level boiler. It is the cheapest combi boiler in the Greenstar range and fits small spaces perfectly. This boiler is perfect for apartments and small properties with one bathroom.

The next step up from the entry-level boiler is the Greenstar 4000. This combi boiler is capable of providing heating and hot water for a small-to-medium-sized house with one bathroom. It’s quiet and compact, with greater functionality and a contemporary design.

For properties with more than one bathroom, the Greenstar 8000 is big enough to cope with the extra demand for hot water. This sleek high-gloss boiler has the longest guarantee of any Worcester Bosch boiler and has a raft of functions. 

Smart thermostat

What is the Bosch EasyControl feature? 

The Bosch EasyControl is an internet-connected smart thermostat that connects your boiler to your phone so you can control your heating from anywhere. It’s compatible with the Bosch app and other third-party apps with an adaptor. 

With smart radiator thermostats (smart TRV), you can control the heating in individual rooms from wherever you are. Smart thermostats are a great way of saving energy, helping you cut your carbon emissions and your fuel bill.  

The Bosch app has a range of functions to manage your home heating. You can view graphs that show your gas consumption and set reminders for your annual boiler service. 

How much is a new boiler? 

Replacing your old boiler with a new combi boiler will set you back somewhere between £2,500 and £4,000, according to USwitch data. This is a rough guide, and there are a lot of factors to consider.

  • The type and size of your new boiler 
  • How much work needs to be done to remove and replace your old boiler 
  • Upgrades to your existing pipework and radiators
  • Disposal of your old boiler 
  • Extras such as smart thermostats and thermostatic radiator valves   

This might seem like a scary amount of money, but switching to a more energy-efficient combi boiler will save you money in the long run. 

According to the Energy Saving Trust, upgrading a G-rated boiler to an A-rated boiler with a smart thermostat in a semi-detached house could reduce your annual fuel bill by £540. 

Buying a new boiler on finance 

It’s possible to spread the cost of your boiler replacement over several months with boiler finance.

At Arton Plumbing and Heating, we offer our customers interest-free payment options. You choose how much you want to borrow and whether to repay it over 12 months or two years.

For easy, manageable payments, you can spread the cost over a longer period with interest.

To be eligible, you have to meet certain criteria. 

  • A UK resident for more than 12 months 
  • Aged 18 or over 
  • Have your own bank account 
  • Own and occupy your own home 

You’ll find the full details on our boiler finance pages, along with a handy finance calculator to determine how much you’ll be paying back each month. 

Worcester Bosch Greenstar 4000 boxed

What to consider when buying a new boiler 

Before you decide which Worcester Bosch boiler is best for you, consider how much space you’ve got available and where your new boiler will live. 

If you’ve got a limited amount of space and your boiler is likely to live in the kitchen, opt for something compact like the Greenstar 2000. At just 724mm x 400mm x 300mm (h x w x d), it’s one of the smallest wall-hung combi boilers you can get. 

This must be balanced against the size of your house and your hot water requirements. As a general rule of thumb, the more bathrooms you have, the bigger your boiler needs to be to cope with the extra demand. 

And finally, consider also the fuel available in your area – is your home connected to the gas network? According to uSwitch’s 2023 boiler statistics, 5% of UK homes use oil to power their central heating.

All new Worcester Bosch gas boilers are designed to take a 20/80 blend of hydrogen and gas, guaranteeing that your boiler is future-proof.

Get a glimpse into what the future of home heating might look like in this article. 

Greenstar boilers compared – the final verdict 

Worcester Bosch is a big name in boilers, and its reputation counts for a lot. It’s backed up by over 37,000 real-world reviews on TrustPilot and nearly a decade of Which? Best Buy awards.

The Greenstar range is their flagship brand of boilers, offering everything from affordable entry-level combi-boilers to high-end premium boilers packed with extra features and a lengthy guarantee.

Whatever boiler you choose – you’re in good hands. Worcester Bosch has a nationwide network of approved heating engineers, accredited to install and service their boilers. 

*See the Worcester Bosch website for full terms and conditions 

Post author

Daniel Arter

Date of post

June 12, 2023


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