Written by Stephen Day
Gas Safe Engineer
Updated: 10th October, 2025
With the colder months quickly approaching (sigh), a new, efficient Worcester Bosch combi boiler could help keep your home warm and toasty going into 2024 (hurray!).
A reputed boiler brand since 1962, Worcester Bosch is synonymous with customer satisfaction, blending high end technology with assured traditional engineering.
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With no less than eleven Which? Best Buy awards, Worcester Bosch continues to demonstrate the excellence in production and service that has made the brand an industry leader for over 50 years.
Worcester Bosch produces many types of top quality boilers, but the combi range is their most popular and efficient, highlighting their design expertise and garnering public recognition/industry accolades alike.
Just in case you aren't 100% sure what a combi boiler is, or how it functions -
Unlike conventional boilers, combi (combination) boilers link a home’s central heating system and water heating.
A combi takes water directly from the mains and heats it upon usage. After detecting a hot water request, the combi begins to burn gas in a combustion chamber.
The hot gases rise and move through a series of pipes and into a component called a heat exchanger, the hot gas running through the exchanger then heats the surrounding cold water.
In a conventional boiler system, this process is done according to a programme and the water is stored in a separate cylinder until it’s needed. A combi only starts this cycle upon request (initiating the heating or turning on a hot water outlet), therefore the hot water is instant.
Compact size
Highly efficient
Good water flow pressure
Clean & safe
Instantaneous hot water
The Greenstar 2000 is Worcester Bosch’s economically priced efficient combi, ideal for small to medium sized properties with one bathroom. As the quietest combi Worcester Bosch makes, this compact boiler is guaranteed to save space and reduce potential noise pollution.
Energy efficiency | 93% |
ErP | A rated |
Warranty | 6 Years |
Dimensions | 724mm (Height) x 400mm (Width) x 300mm (Depth) |
Available in | 30kW |
Prices starting from (inc.installation and VAT) - £2,225
Worcester Bosch’s Greenstar 4000 is suitable for heating medium sized properties, operates extremely quietly and even works very well in areas with a lower water pressure.
Energy efficiency | 91% |
ErP | A rated |
Warranty | 10 years |
Dimensions | 724mm (Height) x 400mm (Width) x 310mm (Depth) |
Available in | 30kW |
Prices starting from (inc.installation and VAT) - £2,245
Designed to easily fit into a standard kitchen cupboard, this combi is powerful enough to serve small, medium, or large homes with one or two bathrooms. This combi can fill a standard kitchen sink in just 37 seconds!
Energy efficiency | 91% |
ErP | A rated |
Warranty | 10 years |
Dimensions | 680mm (Height) x 390mm (Width) x 280mm (Depth) |
Available in | 28kW, 32kW, 36kW |
Prices starting from (inc.installation and VAT) - £2,185 (28kW), £2,390 (32kW), £2,690 (36kW)
Suitable for heating larger homes, the 8000 Life is part of Worcester Bosch’s most powerful wall-hung boiler collection. A new design and increased smart tech compatibility mean this combi is as brainy as it is brawny.
Energy efficiency | 94% |
ErP | A rated |
Warranty | 10 years |
Dimensions | 780mm (Height) x 440mm (Width) x 365mm (Depth) |
Available in | 30kW, 35kW |
Prices starting from (inc.installation and VAT) - £2,595 (30kW), £2,745 (35kW)
The 8000 style is Worcester Bosch’s latest combi model, stylish and strong, the 8000 is packed with the latest technology to keep you and your home warm, whilst it hardly breaks a sweat.
Energy efficiency | 94% |
ErP | A rated |
Warranty | 10 years |
Dimensions | 780mm (Height) x 440mm (Width) x 365mm (Depth) |
Available in | 30kW, 35kW |
Prices starting from (inc.installation and VAT) - £2,695 (30kW), £2,750 (35kW)
Explore our new boiler cost guide now!
At iHeat we stock a massive range of powerful and sleek new combi boilers, designed to save space and perform at the highest level. With sizes to fit any property, now might be the perfect time to replace an old boiler and upgrade to an efficient combi.
Get a free instant fixed price quote on our combi range, with next day Gas Safe installation available, getting a new boiler has never been so easy.
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0% APR finance available.
Last updated: 10th October, 2025
Written by Stephen Day
Gas Safe Engineer
Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling, and renewable energy industry, specialising in boiler installations, air conditioning, and heat pump systems.
LinkedInArticles by Stephen Day are reviewed by iHeat’s technical team to ensure accuracy and reliability.
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