Facebook pixel
new boiler

Get a new boiler

Fixed price boilers, next day

See boiler prices
new air conditioning

Air Conditioning

Get a quote
new heat pump

Heat Pumps

Coming soon

new ev charger

EV Chargers

Get a quote
boiler servicing

Boiler Servicing

Get a quote

Last updated: 28th February, 2024


Which Worcester Bosch Boiler is Best?

Which Worcester Bosch Boiler is Best?

Key takeaways

  • There are three main types of boiler in the UK: a combi, a system and a regular (heat only boiler), all of which Worcester Bosch manufacturer to market leading standards.
  • Worcester Bosch Greenstar boilers are the range topping branch of the brand, efficient, environmentally friendly and powerful.
  • Gas boilers are safe, cost effective and extremely popular.

Choosing the right boiler for your property is crucial to ensure optimal heating efficiency and comfort. Worcester Bosch, a renowned brand in the heating industry, offers a wide range of high-quality boilers designed to suit different property types and heating requirements.

In this blog, we will explore several popular Worcester Bosch boilers and discuss the variables that make certain models well-suited to specific property types. 

At iHeat, we understand the importance of finding the perfect boiler for your home, and we're here to guide you through the process.

Need a new boiler?

Get a quote in 60 seconds, fitted as fast as next day!
0% APR finance available.

Get a quote

Boiler Types


Combis or combination boilers, combine all components and aspects of a heating system (central heating and hot water production) into one succinct and powerful unit.

Their economic size, quick flow rates and dual functionality means combis are extremely efficient and effective when heating a multitude of property sizes, being best suited for small to medium sized homes with 1-2 bathrooms.


System boilers perform best in homes with a high hot water demand, specifically either larger properties with a higher number of residents or properties with two or more bathrooms. 

System boilers store hot water in a separate cylinder which provides constant flow access but requires additional (minimal) storage space.

System boilers can service multiple flow outlets at one time, meaning no one in a larger home would be standing around waiting for a shower.

Heat Only

A heat only boiler provides the heat for a home's central heating system and hot water cylinder. A heat only boiler is suited to servicing larger properties with multiple bathrooms/radiators or a business premises with a high water demand. 

Heat only boilers do require sufficient installation space within a property, as they use two storage tanks (feed & expansion) as well as the aforementioned hot water cylinder. 

Although a combi is generally considered more space saving, a modern heat only boiler is still compact and can supply more bathrooms with hot running water than a combi can.

Worcester Bosch Greenstar 8000 Lifestyle

The Worcester Bosch Greenstar 8000 Lifestyle range combines cutting-edge technology with sleek design, making it an excellent choice for modern properties. 

This boiler series is available in both combi and system boiler options, providing flexibility based on your heating and hot water needs. 

The Greenstar 8000 Lifestyle range offers high energy efficiency ratings, ensuring reduced energy consumption and lower heating costs. Its advanced features, such as the innovative digital display and compatibility with smart thermostats, allow for easy control and monitoring of your heating system.


Worcester Bosch Greenstar i

The Worcester Bosch Greenstar i series is a popular choice for small to medium-sized properties. With compact dimensions and a range of outputs available, it offers flexibility in installation options. 

The Greenstar i boilers are known for their reliability and high efficiency, helping homeowners save on energy bills. These boilers feature user-friendly controls and compatibility with smart thermostats, allowing you to adjust heating settings effortlessly. 

The Greenstar i series also incorporates advanced technology for improved performance and reduced carbon emissions.


Worcester Bosch Greenstar CDi Classic

If you have a larger property with higher hot water demands, the Worcester Bosch Greenstar CDi Classic range is worth considering. These boilers are available in regular, system, and combi options, catering to different heating system setups.

The CDi Classic boilers deliver powerful performance, ensuring a constant supply of hot water even in larger households. They boast high energy efficiency ratings, advanced controls, and compatibility with smart technologies, making them an ideal choice for modern, energy-conscious homes.


Worcester Bosch Greenstar Si Compact

For properties with limited space, the Worcester Bosch Greenstar Si Compact range offers a space-saving solution without compromising on performance. These compact boilers are designed to fit snugly into small cupboards or tight spaces. 

The Greenstar Si Compact series delivers excellent energy efficiency and reliable heating, making it suitable for apartments, small houses, or properties with restricted installation areas. Despite their compact size, these boilers incorporate advanced features and intelligent controls for efficient heating management.


Finding the best Worcester Bosch boiler for your property depends on several factors, including property size, hot water demands, and installation requirements. 

At iHeat, we offer a wide range of Worcester Bosch boilers to suit various property types and heating needs. Whether you have a small apartment or a larger family home, there is a Worcester Bosch boiler that can meet your requirements. 

Consider factors such as size, output, energy efficiency ratings, and additional features like smart compatibility when choosing the right boiler for your property.

Remember, professional advice from heating experts is essential to ensure you select the most suitable Worcester Bosch boiler for your specific needs. 

Is It Worth Getting A New Gas Boiler?

Despite recent misconceptions that there is a looming ‘ban’ on gas boilers, this is actually incorrect!

It’s still completely legal to buy and install a new gas boiler in any type of property, the supposed ‘ban’ only applies to new build properties after 2025.

There is no current financial penalty to keeping an existing gas boiler in any type of property past 2025, or installing a new gas boiler in any pre existing property past 2025.

New gas boilers blend efficiency, safety, cost effectiveness and versatility, hence their constantly rising popularity.

Get a quote

Frequently Asked Questions

Are Worcester boilers worth the money?

Worcester boilers are often considered worth the money due to their reputation for reliability, efficiency, and longevity. Known for their high-quality manufacturing and comprehensive warranty offers, Worcester boilers can provide peace of mind and potentially save money in the long run through efficient energy use. However, the value for money can vary based on individual needs, the specific model chosen, and the installation costs. Comparing features, warranties, and energy efficiency ratings with other brands can help determine if a Worcester boiler is the best investment for your home.

Why is my Worcester Bosch boiler not firing up?

A Worcester Bosch boiler might not fire up for several reasons, including low water pressure, issues with the thermostat, a power cut or electrical issue, a frozen condensate pipe, or a fault within the boiler itself. First, check the boiler's pressure gauge and ensure it's within the recommended range. Also, verify that there's power to the boiler and that the thermostat is set correctly. If these checks do not resolve the issue, it may be necessary to consult the boiler's manual for specific troubleshooting advice or contact a professional heating engineer.

How do I reignite my Worcester boiler?

To reignite a Worcester boiler, you typically need to follow the boiler's specific instructions for resetting or reigniting, which can often be found in the user manual. Many Worcester boilers have a reset button or procedure, usually involving pressing and holding a reset button for a few seconds. If your boiler has a pilot light that needs to be manually reignited, the manual will provide step-by-step instructions. If you're unsure or the boiler doesn't reignite, it's advisable to contact a professional for assistance.

How do you reignite a Worcester Bosch boiler?

Reigniting a Worcester Bosch boiler generally involves pressing the reset button on the boiler. The exact process can vary between models, so it's important to consult your boiler's user manual for specific instructions. If the boiler does not reignite after pressing the reset button, or if there's no reset button visible, the issue might require professional attention. Ensure that you've checked the boiler's pressure and that there are no apparent issues with the power supply before attempting to reignite the boiler.

What happens when you press the reset button on a Worcester boiler?

Pressing the reset button on a Worcester boiler typically clears any fault codes and attempts to restart the boiler's operation. This can resolve temporary issues or glitches that caused the boiler to shut down or lock out. After pressing the reset button, the boiler will go through its startup sequence, which may include checking for safe operating conditions before firing up again. If the boiler does not start after a reset or repeatedly requires resetting, this indicates a deeper issue that needs professional diagnosis.

Should the green light be on on a Worcester boiler?

Yes, a green light on a Worcester boiler usually indicates that the boiler is operating correctly and there are no current faults. The green light can be a power indicator or a signal that the boiler is functioning within its normal operational parameters. However, the meaning of indicator lights can vary between models, so it's essential to consult your boiler's manual for specific information about what the green light and any other indicator lights mean for your particular model.

What is the most economical setting on a Worcester boiler?

The most economical setting on a Worcester boiler typically involves using a lower temperature setting for heating water and spaces, combined with effective use of the programmable thermostat to ensure heating is only on when needed. Setting the thermostat to maintain a comfortable yet moderate temperature, and using timer settings to heat the home only during periods of occupancy or just before, can significantly reduce energy usage and costs. The exact settings will depend on your personal comfort preferences and home insulation, but starting with the recommended settings in the boiler's manual and adjusting based on your needs is a good strategy.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.