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Worcester Bosch Greenstar 4000 12kW boiler

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Plumbproud rating

92.50%

Worcester Bosch Greenstar 4000 12kW System Gas boiler

We scored this Worcester Bosch Greenstar 4000 12kW System boiler at 92.50% on our internal benchmarking system. To determine a score, we take into consideration a number of different factors including the boiler's energy efficiency, installed price, likely running costs, and the length of the manufacturer's warranty.

We estimate that this Worcester Bosch Greenstar 4000 12kW System boiler will cost £2,000 fully installed through PlumbProud provided that the fit is straightforward.

For professional advice on whether the Worcester Bosch Greenstar 4000 12kW is the right boiler for your home or to receive a free quotation, please call 01604 343053 to speak to our friendly team. You are also welcome to email us by clicking here or you can enter your postcode into the quotation box on this page.


Installed price around

£2,000

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Worcester Bosch Greenstar 4000 12kW System Gas boiler frequently asked questions

Worcester Bosch Greenstar 4000 12kW - a system boiler, regular boiler or combi boiler?

When looking for a system boiler for your house or flat, the Worcester Bosch Greenstar 4000 12kW might be a suitable option for you.

System boilers need a hot water cylinder to work, with the most popular installation location for cylinders being in an airing or landing cupboard. Unlike heat only boilers though, they don't require a separate cold water tank to go in the attic, making them suitable if roof space is at a premium or if you're planning a loft conversion in the future.

System boilers use (often built-in) circulating pumps to distribute hot water to your taps and radiators. Fitting is cheaper and quicker too because you don't need to find room for a water tank. Unlike with a combi boiler, which heats water it draws from the mains instantly, you have to program a system boiler with the times you want hot water and heating.

Is a Worcester Bosch Greenstar 4000 12kW system boiler appropriate for my house or apartment?

It's best to choose a boiler whose size or "output" is right for your property. With boilers, however, size does not mean how big a boiler is, it means how much power it has.

A boiler’s output indicates the amount of power it can use when heating the water which it then sends to your taps and radiators. The higher the output rate, the more water it can heat.

If a boiler’s output is too low, there will be times when your hot water might not be as hot as you want it to be. If it is too high, you’ll likely be paying more than you need to for your gas.

Measured in kilowatts, the Worcester Bosch Greenstar 4000 12kW system's output level is 12 kW, so which types of property would this Worcester Bosch Greenstar 4000 12kW System boiler be an appropriate choice for?

A heating engineer would recommend that the Worcester Bosch Greenstar 4000 12kW system boiler would be a suitable installation option for smaller homes and apartments with up to 10 radiators and one bathroom.


How big is the Worcester Bosch Greenstar 4000 12kW?

The Worcester Bosch Greenstar 4000 12kW measures 724 mm tall, 400 mm wide, and 310 mm deep.

Is the Worcester Bosch Greenstar 4000 12kW a condensing or non-condensing boiler?

Is the Worcester Bosch Greenstar 4000 12kW system good for the environment?

Many homeowners are now worried about climate change and the damage they do to the environment from heating their homes has become a subject of increasing concern.

As much as 14% of the UK’s greenhouse gas production derives from our domestic central heating systems. Gas boilers are responsible for dangerous levels of nitrogen dioxide emissions in Britain's largest cities.

Is the Worcester Bosch Greenstar 4000 12kW system boiler an environmentally friendly choice for your home? Here’s what the figures say.

The energy efficiency rating of the Worcester Bosch Greenstar 4000 12kW is 94% with a SEDBUK band rating of "A".

Energy efficiency tests record how much energy is wasted on non-core functions during an operation.

By law, all boilers manufactured and supplied in the UK must have a minimum energy efficiency performance level of 92% (equivalent to a SEDBUK "A" grade). Up to April 2018, the minimum performance level was 88% (88% and 89% are equivalent to a SEDBUK "B" grade and 90%+ an "A" grade).

Energy-efficient boilers help the environment as they require less fuel and emit fewer harmful gases. In 2015, the EU introduced the Energy Related Products Directive (ERP) with the aim of ensuring that all manufacturers, including boiler manufacturers, developed more efficient products and processes.

This legislation aims to conserve energy at all life cycle stages, from initial production through to actual use by a customer and up to the point of disposal.

The Worcester Bosch Greenstar 4000 12kW has been given an ERP rating of "A".

How long is the warranty period on a Worcester Bosch Greenstar 4000 12kW system boiler?

The Worcester Bosch Greenstar 4000 12kW boiler comes with a parts and labour warranty of 7 years.


Worcester Bosch Greenstar 4000 12kW Gas System boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW12 kW
Height724 mm
Width400 mm
Depth310 mm
MountingWall
ERP HeatA

The top 10 rated Gas System boilers

Using the Plumbproud scoring system, the current 10 ten Gas System boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 61295.72%
2Vaillant ecoTEC Plus 61595.20%
3Vaillant ecoTEC Plus 61894.37%
4Vaillant ecoTEC Plus 62493.33%
5Worcester Bosch Greenstar i System 9i92.89%
6Vaillant ecoTEC Plus 63092.75%
7Worcester Bosch Greenstar 4000 12kW92.50%
8Vaillant ecoTEC Exclusive IQ 62792.42%
9Vaillant ecoFIT Pure 61292.38%
10Vaillant ecoFIT Pure 61592.36%

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Worcester Bosch Greenstar 4000 12kW boiler

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Worcester Bosch Greenstar 4000 12kW System Gas boiler

  1. Home
  2. Worcester Bosch Greenstar 4000 12kW
Plumbproud rating for this boiler
92.50%

Our PlumbProud quality scoring system considers important factors like energy efficiency, the length of a manufacturer’s guarantee, likely running costs, and installed price to determine a boiler's value for money. This model has received 92.50% from our engineers.

On most non-complicated installations, we would expect this Worcester Bosch Greenstar 4000 12kW System boiler to cost £2,000 including installation if you choose PlumbProud to do the work.

Wondering if the Worcester Bosch Greenstar 4000 12kW is the right boiler for your home? Then speak to a professional here by getting in touch via email or call us on 01604 343053. You can also get a free quote by entering your postcode in the box on the page.


Installed price guideline
£2,000

Get your free quote

Worcester Bosch Greenstar 4000 12kW Gas System boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW12 kW
Height724 mm
Width400 mm
Depth310 mm
MountingWall
ERP HeatA

Worcester Bosch Greenstar 4000 12kW System Gas boiler frequently asked questions

Worcester Bosch Greenstar 4000 12kW - a combi boiler, system boiler or regular boiler?

If you are considering installing a system boiler in your house or flat, then the Worcester Bosch Greenstar 4000 12kW boiler is certainly worth investigating.

System boilers are very popular for properties with limited or no loft space or when homeowners want to keep the space for a loft conversion. This is because, unlike heat only boilers, they don’t require a cold-water tank - however, system boilers do need a hot water cylinder (often installed in an airing or landing cupboard).

Instead of the traditional cold-water tanks, system boilers use their built-in circulating pumps to heat the water needed for your taps and radiators. This also makes them an easier choice for engineers to install as there is one less large component to find space for and fit.

Like a regular boiler, you need to use a control panel to control a system boiler. Set the times when you want central heating and hot water to be available, such as in the morning when there might be greater demand for showers, and it will be there. Although hot water is not available on-demand like with a combi boiler, once the water has been heated it will stay in the hot water cylinder until it’s used up.

Is a Worcester Bosch Greenstar 4000 12kW system the right boiler for my house or flat?

Whether this Worcester Bosch Greenstar 4000 12kW System boiler is right for your property depends on its size or what its "output" level is. Size does not mean its physical dimensions, however - it means how powerful it is.

The output rating indicates how much energy a boiler can use in providing you with hot water and heat when you need it from your radiators and taps. The greater the output, the more water it can heat.

It's better to take advice on this from a registered installer because, if your boiler output is too low, your water and radiators might not get as hot as you would like them to be. However, if the output level is too high, you'll end up paying more on your gas bills than you need to.

Which types of property would this Worcester Bosch Greenstar 4000 12kW System boiler be appropriate for given its output of 12 kW?

An experienced PlumbProud heating engineer would recommend that the level of output from this Worcester Bosch Greenstar 4000 12kW System boiler would make it a suitable installation option for smaller homes and apartments with up to 10 radiators and one bathroom.


Dimensions of the Worcester Bosch Greenstar 4000 12kW boiler

The Worcester Bosch Greenstar 4000 12kW measures 724 mm in height by 400 mm in width by 310 mm in depth.

Is this Worcester Bosch boiler non-condensing or condensing?

Is the Worcester Bosch Greenstar 4000 12kW system boiler environmentally friendly?

As the British public has become more conscious of climate change, many homeowners consider the environment when choosing how to heat their homes.

With central heating being responsible for 14% of greenhouse gas emissions in the UK, your choice of boiler matters. Gas boilers are also responsible for the significant atmospheric volumes of dangerous nitrogen dioxide emissions in larger British cities.

Would installing the Worcester Bosch Greenstar 4000 12kW system in your home be an environmentally friendly decision? Let's look closely at the figures.

By law, boilers manufactured and supplied in the UK must achieve a SEDBUK rating of "A" and work at a 92% minimum efficiency. Before April 2018, a minimum of 88% energy efficiency needed to be achieved (88/89% = SEDBUK "B" and 90% = SEDBUK "A").

Following official testing, the Worcester Bosch Greenstar 4000 12kW was given an efficiency rating of 94% with a SEDBUK rating of "A".

Energy efficiency is a measure of how much energy is used and how much is wasted when a boiler is operating.

The Energy Related Products Directive (ERP) was introduced in 2015 and applies to all products that consume energy throughout their lifetime, including during the manufacturing process and at the point of final disposal.

The purpose of the ERP is to ensure that companies create products that are kinder to the environment by reducing both the energy they use and the harmful emissions they produce.

The Worcester Bosch Greenstar 4000 12kW has an ERP rating of "A".

Will I be covered if the Worcester Bosch Greenstar 4000 12kW system breaks down?

Worcester Bosch’s Greenstar 4000 12kW boiler includes a parts and labour warranty of 7 years.


The top 10 rated Gas System boilers

Using the Plumbproud scoring system, the current 10 ten Gas System boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 61295.72%
2Vaillant ecoTEC Plus 61595.20%
3Vaillant ecoTEC Plus 61894.37%
4Vaillant ecoTEC Plus 62493.33%
5Worcester Bosch Greenstar i System 9i92.89%
6Vaillant ecoTEC Plus 63092.75%
7Worcester Bosch Greenstar 4000 12kW92.50%
8Vaillant ecoTEC Exclusive IQ 62792.42%
9Vaillant ecoFIT Pure 61292.38%
10Vaillant ecoFIT Pure 61592.36%
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