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How much are Worcester Bosch combi boilers?

Author

Michael Henderson

Updated on March 15, 2026

How much are Worcester Bosch combi boilers?

The Worcester Bosch Boiler Models
ModelTypeTypical Price
Greenstar 24i SystemSystem£930.08
Greenstar 30SiCombi£952.64
Greenstar 28CDi CompactCombi£973.44
Greenstar 29CDi ClassicCombi£1018.8

Hereof, how much does it cost to have a combi boiler installed?

A) Replacing an existing combi boiler

Installation of a new combi boilerApprox cost with mid range boilerTime taken
1) Replacing an existing combi boiler with a new boiler, in the same location£2,0001 day
2) Replacing an existing combi boiler with a new boiler, in a new location£2,6001.5 days

Subsequently, question is, what size Worcester Bosch combi boiler do I need? As a rough estimate most flats, apartments and smaller houses, with up to 10, average size radiators and 1 bathroom* will require a 24 to 27kw Combi Boiler. For a medium to large 3-4 bedroom house with up to 15 average size radiators, 1 bathroom and an ensuite* bathroom, a 28-34kw Combi Boiler would be installed.

Keeping this in view, what is the best Worcester Bosch combi boiler?

The top of the range Greenstar CDI Classic combi boilers are high performance boilers suitable for small, medium and large sized properties with one or two bathrooms. Known for their exceptional efficiency and reliability, they are wall-mounted and offer the highest levels of hot water comfort.

How good are Worcester Bosch boilers?

It is undeniable that one of the best-selling and therefore most popular combi boilers available at the moment is the impressive Worcester-Bosch Greenstar 25i. The appliance has a high ErP rating of above 90% and is best suited to smaller homes and flats (such as 1 to 3 bedrooms with 1 bathroom).

How much does it cost to install a new gas boiler UK?

The average installation cost of a new boiler in the UK is £500-1,500. However, these costs can change significantly based on if you are buying the same type of boiler as you last one, or you are converting to a different type of boiler.

How much does it cost to install a new gas boiler?

The cost of replacing a standard gas boiler is about $4,000. A high-efficiency model costs about $7,500. This cost estimate usually includes removal and disposal of the old unit, as well as all necessary lines and wiring needed for the new system to run properly.

Can I get a grant for a new boiler?

Free Boiler Grants. Under the Governments ECO Scheme in 2020, qualifying home owners could have their old in-efficient boilers replaced completely free of charge, or heavily subsidised. If you qualify, we can arrange for a local, approved company to contact you to complete the installation of your new boiler.

How long does it take to install a boiler?

Generally though, if you have a simple like-for-like boiler swap where you are replacing your old boiler with a new boiler of the same type and making no change to the location, then your installation could take 1-2 days. However, this is assuming there are no complications with the rest of your system or home.

Can I install my own combi boiler?

Is it possible to install a combi boiler by yourself? To follow building and safety regulations, new gas boilers need to be installed by an installer with a Gas Safe certificate. However, a reliable engineer will likely be hesitant to commission a boiler that they have not personally fitted.

Should I replace 40 year old radiators?

If you're asking “how often should radiators be replaced?”, there's no easy answer but a general guideline is anywhere between fifteen and twenty years. If your radiators are nearing this age range, it's worth being conscious of how they're performing.

Who qualifies for a boiler grant?

Who Qualifies For A Boiler Grant?
  • Automatically Qualify.
  • Pension Credit. Child Tax Credits (Household income below £16,010 per year)
  • Main Benefit. Component.
  • Disability Living Allowance (Higher Rate) Pension Premium.
  • Over 60 years old. Receive disabled worker element.
  • Child under 16. Child under 20 (not in higher education)

How much does it cost to fit a Worcester Bosch combi boiler?

Worcester Boiler Costs
Boiler Make & ModelTypical Cost of BoilerFitted Price*
Worcester Greenstar 38CDi Classic Combi Gas Boiler£1,331£1,831 – £2,131
Worcester Greenstar 27i System Gas Boiler£981£1,481 – £1,981
Worcester Greenstar 24Ri Regular Gas Boiler£900£1,400 – £1,900

What is the cost of a Worcester boiler?

Worcester Bosch boiler prices start at around £780, for the Greenstar 12Ri, which is a regular or conventional boiler. The company's most expensive model, the Greenstar Heatslave II External combi boiler, costs about £2,520.

What is the best 2019 combi boiler?

The best combi boiler
Best Combi Boiler RangeAvailable Outputs (kW)Efficiency
Ideal Logic+25, 30, 3594%
Vaillant ecoTEC Plus25, 32, 35 & 3893%
Viessmann Vitodens 200-W26, 30 & 35Up to 98%
Worcester Bosch Greenstar i25, 3094%

What is the best combi boiler to buy?

As we mentioned at the top of the article, the best combi boilers are manufactured by Baxi, Ideal, Vaillant Viessmann and Worcester Bosch.

The best combi boiler

  • Baxi 800.
  • Ideal Logic Plus.
  • Vaillant ecoTEC Plus.
  • Viessmann Vitodens 200-W.
  • Worcester Bosch Greenstar i.

Which Worcester boiler do I have?

The serial number can be found on the label located directly on the front of the cylinder. The serial number and label can be found on the side of the System Care Pack. The Gas Council number can be found on the front cover of Worcester Bosch installation manuals and on the boiler data label.

Which boiler brand is the best?

The Best Combi, Regular & System Boilers
  • Worcester Bosch. The number one on our list is certainly the most well known.
  • Viessmann Boilers.
  • Ideal Boilers.
  • Vaillant.
  • Baxi.
  • Alpha Boilers.
  • Potterton.
  • Glow Worm.

What is the most energy efficient boiler?

The Bosch Greenstar boiler is small, ultra quiet, environmentally friendly, and uses fuel-efficient condensing technology to deliver an AFUE rating of 95%. The Greenstar is available in two models—combi (ZWB) for space and tankless water heating or the space heating (ZBR), which can be used with our DHW tanks.

How many radiators can a 30kW combi boiler run?

As a rough guide most apartments and smaller houses, with up to 10 radiators will require a 24-25kw boiler. A 28-30kw would be installed for a medium to large 3-4 bed house with up to 15 radiators, and a 33-35kw and a 40kw would be for a large house with anything up to 20 radiators.

What is the best combi boiler for a 3 bed house?

In summary the below boilers are the best for a 3 bedroom home: Worcester Bosch Greenstar 30i Combi Boiler. Ideal Vogue C32 Combi Boiler. Ideal Logic C30 Combi Boiler.

What is the best shower for a combi boiler?

Combi boilers run off mains pressure and the result is a boiler that is dependable across electric, digital and mixer showers. Those with a larger hot water supply due to boiler size may prefer a mixer shower, thanks to the sheer power of its flow and boost capability over electric and digital shower systems.

Can a combi boiler run 2 showers?

*However combi boilers do not cope well with 2 showers running at the same time in the same property, due to the use of hot water across both showers. The good news though is that you will no longer need a hot water cylinder or a cold water tank in the loft space, roof or basement though.

How do I know what size combi boiler I need?

An average three or four bedroom house typically has around ten radiators and will usually require a small or medium combi boiler, for example 24-30 kW. A larger house with substantially more radiators or an en-suite bathroom will generally need one that is larger, typically 30-35 kW.

Can you run a shower from a combi boiler?

Can you have a power shower with a combi boiler? In short, no you can't. Power showers operate with an in-built pump that makes them incompatible with combi boilers, and they need to be connected to a hot water cylinder - which is a feature that combi boiler systems don't have.

How close can a combi boiler be to a sink?

As mentioned by others there is no specified minimum distance from a kitchen sink which accessories must be installed, although the general guidance is 300mm and they must be suitable for the environment in which they are installed.

What size gas pipe do I need for a combi boiler?

For enough gas to reach the combi boiler, they need wider gas pipes which is why Gas Safe state that they should be no smaller than 22mm, rather than 15mm, but depending on the power output of the unit they might need larger 28mm or 35mm pipes.

Which is the best Worcester combi boiler?

Review the complete range of Worcester Gas Combi boilers prices…
Boiler ModelkWEfficiency
Worcester Bosch Greenstar 8000 Style 50kW Combi Gas Boiler COMPARE50kw94%
Worcester Bosch Greenstar 8000 Style 35kW Combi Gas Boiler COMPARE35kw94%
Worcester Bosch Greenstar 8000 Life 30kW Combi Gas Boiler COMPARE30kw94%

Are Vaillant boilers better than Worcester Bosch?

Both appliances have been given an A rating, which makes them both highly efficient with the highest attainable rating. In this category in particular, the Worcester Bosch boiler has the edge over the Vaillant boiler at 93% energy efficiency. The Worcester Bosch boiler takes a point over the Vaillant! It's now 2-3.

Are Worcester Bosch boilers noisy?

Boiler manufacturers usually show their decibel rating (dB) in sales brochures and manufacturer's manuals. For example, the Vaillant EcoTec range noise level is 49 dB and the Worcester Bosch Green Star 25i is 53 dB.

What is the best boiler to buy?

Here are the 6 best boilers to buy and install, below:
  • Worcester Bosch. The number one on our list is certainly the most well known.
  • Viessmann Boilers.
  • Ideal Boilers.
  • Vaillant.
  • Baxi.
  • Alpha Boilers.
  • Potterton.
  • Glow Worm.