In this article
Worcester Bosch is one of the best-known boiler brands in the UK. With BoxHeat, a Worcester Bosch combi costs from £2,050 fully fitted. The main decision isn't the brand but the model: Worcester's Greenstar range runs from the entry-level 1000 to the premium 8000+.
This guide explains how the models differ, whether you need a combi, system or regular boiler, what size to choose, and what each one costs fitted. To browse every model, see our Worcester Bosch boilers page.
Is Worcester Bosch a good boiler brand?
The short answer: yes. Worcester Bosch was founded in Worcester in 1962 by Cecil Duckworth and has been part of the German Bosch group since 1992. Its headquarters and factory are still in Worcester.
- Worcester Bosch says its entire gas boiler range can run on a 20% hydrogen blend.
- Engineers know the boilers well and parts are easy to get, which helps keep repairs quick.
The trade-off is price: a Worcester Bosch usually costs a little more than an equivalent Baxi or Glow-worm.
The Greenstar range at a glance
Greenstar is the name of Worcester Bosch's gas boiler range. All are A-rated condensing boilers. Broadly, the higher the number, the more premium the boiler: more output options, more features and a longer warranty.
| Model | Type | Outputs we fit | Guarantee with BoxHeat | Best for |
|---|---|---|---|---|
| Greenstar 1000 | Combi | 24 / 30kW | 5 years | The lowest-cost Worcester Bosch combi |
| Greenstar 2000 | Combi | 25 / 30kW | 7 years | A longer guarantee for a small step up in price |
| Greenstar 4000 | System | 12 / 18 / 21 / 24kW | 8 years | Homes with a hot water cylinder |
| Greenstar Ri | Regular | 12 / 15 / 18 / 21 / 24kW | 8 years | Homes with loft tanks and a cylinder |
| Greenstar 8000+ | Combi, system or regular | Combi 32 to 50kW, system 30 / 35kW, regular 35kW | 10 years | High hot water demand |
| Greenstar 8000+ Style | Combi | 32 / 36kW | 10 years | A boiler on show: gloss black finish |
Combi, system or regular: which do you need?
The type of boiler matters more than the model, and it's mostly decided by what you already have at home.
- Combi: heats water on demand straight from the mains, with no tanks or cylinder. Best when hot water is mostly used in one place at a time. Worcester options: Greenstar 1000, 2000, 8000+ and 8000+ Style.
- System: stores hot water in a cylinder but has no loft tanks. Best when several showers or taps are often used together. Worcester options: Greenstar 4000 and 8000+.
- Regular (heat only): uses a cylinder plus cold water tanks in the loft. Usually found in older homes. Worcester options: Greenstar Ri and 8000+.
Thinking of switching to a combi? Our guide to combi vs system boilers explains the pros and cons.
What size Worcester Bosch combi do you need?
Boiler size is measured in kilowatts (kW). For a combi, the kW figure mostly decides how quickly it can heat water for your taps and shower. As a rule of thumb:
| Your home | Combi size | Worcester Bosch options |
|---|---|---|
| Flat or small house, 1 bathroom, up to about 10 radiators | 24 to 25kW | Greenstar 1000 24kW, Greenstar 2000 25kW |
| 3 to 4-bed house, 1 to 2 bathrooms, up to about 15 radiators | 30 to 32kW | Greenstar 1000 or 2000 30kW, or 8000+ or 8000+ Style 32kW |
| Larger home, 2 bathrooms, 15 to 20 radiators | 36 to 40kW | Greenstar 8000+ 36kW or 40kW, or 8000+ Style 36kW |
| High hot water demand and good mains water flow | 50kW | Greenstar 8000+ 50kW |
Tip: bigger isn't better. An oversized boiler costs more to buy and switches on and off more often, which wastes gas and adds wear. We confirm the right size for your home when we quote.
Worcester Bosch boiler prices, fully fitted
These are our fixed prices for a like-for-like replacement, correct in October 2026. Your exact price depends on your home and is confirmed in your online quote, with no surprise extras on the day.
| Model | Type | Output | Fitted price |
|---|---|---|---|
| Greenstar 1000 | Combi | 24kW / 30kW | £2,050 / £2,100 |
| Greenstar 2000 | Combi | 25kW / 30kW | £2,080 / £2,230 |
| Greenstar 8000+ | Combi | 32kW / 36kW / 40kW / 50kW | £3,130 / £3,530 / £3,749 / £4,170 |
| Greenstar 8000+ Style | Combi | 32kW / 36kW | £3,230 / £3,650 |
| Greenstar 4000 | System | 12kW / 18kW / 21kW / 24kW | £2,500 / £2,700 / £2,620 / £2,695 |
| Greenstar 8000+ | System | 30kW / 35kW | £3,320 / £3,520 |
| Greenstar Ri | Regular | 12kW / 15kW / 18kW / 21kW / 24kW | £2,480 / £2,430 / £2,590 / £2,550 / £2,600 |
| Greenstar 8000+ | Regular | 35kW | £3,570 |
Prices include the boiler, a magnetic system filter, removal of your old boiler, a system flush, controls set-up and installation by a Gas Safe registered engineer. If your home needs extra work, such as moving the boiler or converting to a combi, it's included in your fixed quote. You can also spread the cost with boiler finance.
Keeping your Worcester Bosch warranty valid
Worcester Bosch calls its warranty a guarantee. The lengths above are what you get when we fit the boiler with a Greenstar System Filter, and we register the guarantee with Worcester Bosch for you. Worcester Bosch's main condition is that the boiler is serviced every year by a Gas Safe registered engineer, so keep your service records.
Worcester Bosch boiler questions
Find the right Worcester Bosch boiler for your home
Get my fixed priceReviewed by our technical team. All BoxHeat articles are written by experienced heating professionals and reviewed by our team of Gas Safe registered engineers to ensure accuracy, safety, and compliance with current UK building regulations and manufacturer guidelines.
