If you’re looking to save money on a Worcestershire Bosch boiler installation or replacement, what’s the best way to get the right price for you? To help you, our team have done the research, crunched the numbers, and figured out the very best way to get the perfect Worcester Bosch boiler at a cost within your budget that will save you money for years to come on your energy bills.
What are the current Worcester Bosch boiler prices supply only and with installation? We asked a number of installers up and down the UK to provide us with their average prices and this is what they told us:
| Supply only | Where it is now | A new location | |
| Bosch combi boiler | £765-£1,710 | £1,765-£2,710 | £2,165-£3,170 |
| Bosch conventional boiler | £760-£1,845 | £1,760-£2,845 | £2,160-£3,245 |
| Bosch system boiler | £825-£1,060 | £1,825-£2,060 | £2,225-£2,460 |
You’ll pay more for a new Worcester Bosch boiler if you choose to have installed in a different location within your home. That’s because there’ll be additional piping required for the fit as well as additional labour costs because the installation will take longer to complete.
In this article, we’ll look at what size your Worcester Bosch boiler needs to be to provide your home with central heating and hot water and we’ll follow that by looking at the types of boiler Worcester Bosch manufacture and the differences between them.
What size Worcester Bosch boiler will you need for your home?
Not all boilers are the same. Different types of boilers are designed and manufactured to go into different types of homes.
If you choose a Worcester Bosch boiler that’s too small for your home, it will struggle to provide the central heating and hot water you need on demand.
On the other hand, if you choose a boiler that’s too big for the home you live in, you’ll get all the hot water and central heating you’ll need – the problem is that it’ll cost much more to run than the correct-sized boiler meaning you won’t benefit from the substantial energy bill savings you can make with your replacement Worcester Bosch boiler.
Worcester Bosch boiler size online guide
When a potential installer is around at your home to give you a replacement Worcester Bosch boiler quote, they take three things into consideration when advising you on the right sized boiler for your home.
First, they consider the number of people who live in your home and the likely demand each person will create for hot water and central heating.
Second, they factor in the number of bathrooms in your home, including en-suite bathrooms. They’ll think about the peak times of day and night when hot water will be most in demand for doing the dishes or running a bath.
Third, they count the number of radiators in regular use in your home and weigh that variable into the recommendation they give you.
Below is a rule of thumb guide to the size and type of boiler an installer will recommend for different types of property:
| Type of property | Bedrooms | Bathrooms | Radiators | Ideal boiler size | Ideal boiler type |
| Standard mid-terrace house | Up to 2 | 1 | 10 | 24kW-27kW | Combi |
| Small one-story house | |||||
| Flat or apartment | |||||
| Larger mid-terrace house | Three or four | 1 or 2 | 15 | 28-34kW | Combi |
| Medium one-story house | |||||
| Medium semi-detached | |||||
| Larger semi-detached | Four or greater | 2 or more | 20 | 34-42kW | Combi or Conventional |
| Detached hose |
Nearly two-thirds of British homes (including the majority of new-builds) use combi boilers. In the vast majority of cases, your installer will recommend that you replace an old combi with a new combi.
However, if you and the people you live with use a lot of hot water and you and they like the radiators to be on all or most of the time, let your installer know. He or she may recommend that you select a conventional boiler instead as they’re better at supplying water at the pressures need to cope with heavier-than-normal usages.
Worcester Bosch boiler size dimensions
If you want to have your new boiler installed in the same place as your current one, your installer will recommend a boiler of roughly the same size as you have now.
If you want to install your boiler in a new location, there will nearly always be an additional premium to pay because your installer and his/her team will have to lay out new piping so that the boiler connects with your taps and your radiators. They will recommend a boiler whose size – its physical dimensions measured in height, width, and depth – fits comfortably into that new location where you want your new Worcester Bosch boiler situated.
Worcester Bosch boiler size maximum flow rates
The “maximum flow rate” on your new Worcester Bosch boiler is a measurement of the amount of water than can flow through the boiler at any given time. This is important because the amount of water it can process determines how much water it can send out to your taps or your shower head when you’re using either or both.
Combi boilers can cope with the flow rate requirements of most British homes. However, conventional boilers are much better than combi boilers however at coping with spikes in demand for running water.
Worcester Bosch boiler size output rates
The output rate of your boiler is closely aligned to its maximum flow rate. The more water that your boiler can process, the more powerful your boiler needs to be to be able to heat up the water to the desired temperature before it gets to your taps or to your bath.
Your installer, when recommending a system, will factor how much water you might need, when you need it, and how many taps may be used at peak demand times into their calculation on the output rate your boiler requires so that it provides you with water at temperature you want when you want it.
Worcester Bosch boiler size energy efficiency
Energy efficiency has become increasingly important for homeowners because the cost of electricity and gas seems to continue to rise at a rate well above inflation each year. Installing a boiler with the highest levels of energy efficiency makes a big difference to the amount you’ll pay to power your boiler each year.
The Energy Saving Trust recently published a report showing just how much homeowners could save on their utility bills by replacing a worn-out boiler with a brand new A-rated boiler (provided with thermostatic radiator controls, a room thermostat, and a programmer).
Here’s an aggregation of what they found:
| Energy efficiency rating | Efficiency | Mid-floor apartment | Terraced house | Bungalow, detached | Home, detached | Home, semi-detached |
| G | Less than 70% | £92 | £170 | £150 | £295 | £195 |
| F | 70% to 74% | £63 | £115 | £105 | £205 | £135 |
| E | 74% to 78% | £52 | £95 | £85 | £180 | £110 |
| D | 78-82% | £50 | £85 | £70 | £160 | £100 |
The lowest quote on a replacement Worcester Bosch combi boiler the installers we asked for help provided us with was £1,765. As you can see, if the owner of a mid-sized terrace with an out-of-date G-rated boiler replaced it was a new, state-of-the-art A-rated boiler, they would save £170 in electricity bills. That means that their system would pay for itself in around 10 years.
Worcester Bosch combi boilers
A Worcester Bosch combi boiler both heats your water and controls the central heating around your home from one central unit. With a combi boiler, you don’t need to find space for a large storage tank or hot water cylinder as the water is actually heated directly by the boiler when you switch on your tap.
Combi boilers cope well with most water pressures however they can struggle if more than one tap is being used at a particular time within your home. Combi boiler installations are often cheaper as well than conventional boilers because they require your installer to carry out less piping work.
You can see the current range of Worcester combi boiler prices and specifications below:
| Model | Height | Width | Depth | Max Flow | Output | Rating | %age | Price |
| Greenstar 25Si | 710 | 400 | 330 | 10.2 l/min | 25 kW | A | 90%+ | £850 |
| Greenstar 28i Junior | 710 | 400 | 330 | 11.4 l/min | 28 kW | A | 90%+ | £855 |
| Greenstar 28CDi Compact | 680 | 390 | 280 | 11.4 l/min | 28 kW | A | 90%+ | £975 |
| Greenstar 30Si | 710 | 400 | 330 | 12.3 l/min | 30 kW | A | 90%+ | £955 |
| Greenstar 29CDi Classic | 760 | 440 | 360 | 12.3 l/min | 29 kW | A | 90%+ | £1,020 |
| Greenstar 32CDi Compact | 680 | 390 | 280 | 13.1 l/min | 32 kW | A | 90%+ | £1,085 |
| Greenstar 34CDi Classic | 760 | 440 | 360 | 14.3 l/min | 34 kW | A | 90%+ | £1,060 |
| Greenstar Highflow 550CDi | 850 | 600 | 600 | 14.3 l/min | 30 kW | A | 90%+ | £2,035 |
| Greenstar 36CDi Compact | 680 | 390 | 280 | 14.7 l/min | 36 kW | A | 90%+ | £1,205 |
| Greenstar 38CDi Classic | 760 | 440 | 360 | 16.4 l/min | 38 kW | A | 90%+ | £1,275 |
| Greenstar 42CDi Classic | 760 | 440 | 360 | 17.1 l/min | 42 kW | A | 90%+ | £1,435 |
| Greenstar Highflow 440CDi | 850 | 600 | 600 | 20 l/min | 29 kW | A | 90%+ | £1,710 |
| Greenstar 24i Junior | 710 | 400 | 330 | 9.8 l/min | 24 kW | A | 90%+ | £765 |
Worcester Bosch conventional boilers
Replacement Worcester Borsch conventional boilers are generally installed in homes that already have a conventional boiler which is nearing the end of its life cycle. Conventional boilers use a cold water storage tank which is normally housed in your loft and this cold water storage tank is connected to and feeds water to the hot water cylinder which you normally find in an airing cupboard.
Conventional boilers are better for properties where there is an older radiator system, where there are two or more bathrooms, where local water pressure is low, and for homes with high hot water usage.
You can see current supply-only Worcester conventional boiler prices together with their specifications below:
| Model | Height | Width | Depth | Max Flow | Output | Rating | %age | Price |
| Greenstar 30CDi Classic Regular | 760 | 440 | 360 | 14.3 l/min | 34 kW | A | 90%+ | £1,060 |
| Greenstar 12Ri | 600 | 390 | 270 | N/A | 12 kW | A | 90%+ | £760 |
| Greenstar 15Ri | 600 | 390 | 270 | N/A | 15 kW | A | 90%+ | £780 |
| Greenstar 18Ri | 600 | 390 | 270 | N/A | 18 kW | A | 90%+ | £840 |
| Greenstar 24Ri | 600 | 390 | 270 | N/A | 24 kW | A | 90%+ | £875 |
| Greenstar 40CDi Classic Regular | 760 | 440 | 360 | N/A | 40 kW | A | 90%+ | £1,365 |
| Greenstar FS 30CDi Regular | 850 | 400 | 600 | N/A | 30 kW | A | 90%+ | £1,400 |
| Greenstar FS 42CDi Regular | 850 | 400 | 600 | N/A | 42 kW | A | 90%+ | £1,845 |
Worcester Bosch system boilers
A Worcester Bosch system boiler system shares many features with a conventional boiler expect that there is no need for a separate cold water storage tank. Instead, a system boiler only needs a hot water cylinder which contains all the heating and hot water parts in its construction.
System boilers are generally cheaper to run than conventional boilers, work best in properties containing more than one bathroom, and can supply hot water at the same pressure to as many taps as you want. Installation time required for a system boiler is usually less than with a conventional boiler.
Below, please see a list of supply-only Worcester system boilers with prices and their specifications.
| Model | Height | Width | Depth | Max Flow | Output | Rating | %age | Price |
| Greenstar 30CDi Classic System | 760 | 440 | 360 | 14.3 l/min | 30 kW | A | 90%+ | £1,060 |
| Greenstar 12i System | 710 | 400 | 330 | N/A | 12 kW | A | 90%+ | £825 |
| Greenstar 15i System | 710 | 400 | 330 | N/A | 15 kW | A | 90%+ | £855 |
| Greenstar 18i System | 710 | 400 | 330 | N/A | 18 kW | A | 90%+ | £890 |
| Greenstar 24i System | 710 | 400 | 330 | N/A | 24 kW | A | 90%+ | £930 |
Worcester Bosch history and reputation
Worcester Bosch, established in 1962 and now part of the Bosch organisation, provide solar water heating systems, heat pumps, hot water cylinders, gas boilers, and oil boilers across the UK and around the world.
They operate from two sites in the UK – Worcester and Clay Cross in Derbyshire. Their boilers regularly win the Which? Best Buy Awards and the company supplies its boilers to Sandringham Estate.
In the most recent Which? survey, 9,610 participants rated Worcester Bosch boilers five out of five for both reliability and overall customer score. Installers appreciate the reputation of the company too, scoring the company five out of five for both availability of parts and on engineer recommendations.
Worcester Bosch quality of products
The company’s products are very popular with both homeowners and installers. They currently, at time of writing, enjoy a 9.2 out of 10 rating on TrustPilot based on over 7,000 customer reviews.
Worcester Bosch complaints
Worcester Bosch take customer satisfaction very seriously and they have set up a dedicated customer support centre to help customers find a resolution to any problems they are experiencing.
Complaints can be made direct to the company by online form or by letter.
Worcester Bosch warranty and back-up
Worcester Bosch offers five year guarantees as a minimum on all of their boilers and some even come with a seven year after-sales commitment. If you choose to have your boiler installed by a Worcester Bosch accredited engineer, you receive additional free cover taking the length of your guarantee up to between seven and ten years.
In addition to their warranties, the company offers customers and installers full back-up and support. There are three general support lines available to you (one for general enquiries, one for technical support, and one for renewables support).
Their site has an online troubleshooting section and there are ways to book a boiler service and book a breakdown engineer over the internet as well as by phone. You can also book an engineer appointment if your boiler is not in its guarantee anymore as well as subscribe to one of their product service plans to provide additional after-warranty peace of mind.
Worcester Bosch boiler installation
Any Worcester Bosch boiler must be installed by a professional signed up to the Gas Safe Register (click here for more). The Gas Safe Register (previously known as the Corgi scheme) is a central database of trained installers who have the necessary experience and qualifications to handle installations, repairs, and maintenance of gas-powered equipment.
If you engage a heating technician to install your Worcester Bosch boiler, they may either have accreditation from OFTEC or be registered with the MCS
Can I do a DIY Worcester Bosch boiler installation?
All installations of gas-powered equipment like a Worcester Bosch boiler must be carried out by a Gas Safe Register-approved professional. If you currently do not have this accreditation with them, it is against the law to install a new boiler or replace an old boiler.
Worcester Bosch qualified installer quotes
You can save time and money on your Worcester Bosch boiler installation or replacement by filling out the form on this page. We’ll put you in touch with 3-4 local Gas Safe Registered installers who will provide you with all the advice you need together with a free quote. And it’s an installer that will visit you, not a commission-only salesman!
Our service is free, all the quotes you receive are free, and there’s no obligation on you to purchase from any of the installers we put you in touch with.
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