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Worcester Bosch Greenstar 4000 21kW boiler

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Plumbproud rating

90.81%

Worcester Bosch Greenstar 4000 21kW System Gas boiler

In our PlumbProud quality testing, this Worcester Bosch Greenstar 4000 21kW System boiler scores 90.81%. We determine our rating based on a number of different factors including installation costs, manufacturer guarantees, energy efficiency, and operating costs.

You should budget around £2,200 for the supply and installation of this Worcester Bosch Greenstar 4000 21kW System boiler by PlumbProud.

For a free quote on the Worcester Bosch Greenstar 4000 21kW boiler and to get professional advice and guidance on whether it is the right choice for your home, please enter your postcode in the quote boxes on this page, click here to email us, or call us on 01604 343053.


Installed price around

£2,200

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Worcester Bosch Greenstar 4000 21kW System Gas boiler frequently asked questions

What kind of boiler is the Worcester Bosch Greenstar 4000 21kW - standard, combi or system?

If you are searching for a system boiler for your house or flat, the Worcester Bosch Greenstar 4000 21kW is certainly one to consider.

System boilers need a hot water cylinder to work - normally fitted inside an airing or landing cupboard or similar spot. Unlike heat only boilers, they do not require a separate cold water tank, making them a more suitable choice if you have no loft, lack space in the attic, or are planning to do a loft conversion.

These boilers distribute hot water around your home to your taps and radiators using (often built-in) circulating pumps and they're easier to install as there is one less component (the water tank) to find room for. A system boiler needs to be programmed to tell it what times you want heat and hot water - unlike combi boilers, they don't provide hot water on demand.

Is the Worcester Bosch Greenstar 4000 21kW system boiler the right choice for my house or apartment?

Selecting the right boiler for your property means selecting a boiler that is the right "size". And, by size, we don't mean how big it is, we mean how powerful it is - its "output".

The output rate tells you how much energy your boiler has to use to provide you and your family with hot water and central heating. A higher output rate means that it can heat greater volumes of water.

Please be aware, though - if you choose a boiler whose output is too low, the water in your radiators and coming from your taps may not be warm enough. Conversely, if you choose a boiler with too high an output, you'll pay more for gas than is necessary.

The Worcester Bosch Greenstar 4000 21kW system boiler has an output level of 21 kW, so which types of property would it be appropriate for?

An experienced Gas Safe boiler installer would recommend that the Worcester Bosch Greenstar 4000 21kW system boiler would be an ideal installation option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.


Where will the Worcester Bosch Greenstar 4000 21kW fit in my house?

Worcester Bosch’s Greenstar 4000 21kW is 724 mm tall, 400 mm wide, and 310 mm deep.

Is this Worcester Bosch boiler condensing or non-condensing?

Is the Worcester Bosch Greenstar 4000 21kW system boiler an environmentally friendly choice?

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

The heating of our homes accounts for 14% of the UK's greenhouse gas emissions. Especially in the big cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Would choosing the Worcester Bosch Greenstar 4000 21kW system boiler be an environmentally friendly decision? Here's what the figures say.

The Worcester Bosch Greenstar 4000 21kW has been awarded an efficiency rating of 94% and a SEDBUK band rating of "A".

In the UK, all boilers manufactured and supplied must have an energy efficiency rating of at least 92% or a SEDBUK "A" grade. Until April 2018, the minimum rating was 88% (88% and 89% are equivalent to a SEDBUK "B" rating and anything higher is rated "A").

A boiler's energy efficiency rating describes the amount of energy it uses and wastes when in normal operation.

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, and right through to the point of final disposal.

The Worcester Bosch Greenstar 4000 21kW has a rating of "A" .

Am I covered if the Worcester Bosch Greenstar 4000 21kW system boiler breaks down?

The parts and labour warranty offered with this Worcester Bosch Greenstar 4000 21kW System boiler covers you for 7 years.


Worcester Bosch Greenstar 4000 21kW Gas System boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW21 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 21kW boiler

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Worcester Bosch Greenstar 4000 21kW System Gas boiler

  1. Home
  2. Worcester Bosch Greenstar 4000 21kW
Plumbproud rating for this boiler
90.81%

Considering lots of different factors such as price installed, manufacturer guarantees, energy efficiency, and the likely running cost, we’ve given this Worcester Bosch Greenstar 4000 21kW System boiler a rating of 90.81% using our PlumbProud quality scoring system.

Provided the proposed installation is straightforward, we would anticipate that this Worcester Bosch Greenstar 4000 21kW System boiler will cost £2,200 fully installed through PlumbProud.

For professional advice on whether the Worcester Bosch Greenstar 4000 21kW 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 guideline
£2,200

Get your free quote

Worcester Bosch Greenstar 4000 21kW Gas System boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW21 kW
Height724 mm
Width400 mm
Depth310 mm
MountingWall
ERP HeatA

Worcester Bosch Greenstar 4000 21kW System Gas boiler frequently asked questions

Worcester Bosch Greenstar 4000 21kW - a regular, combi or system boiler?

You may wish to consider installing the Worcester Bosch Greenstar 4000 21kW if you are looking for a system boiler for your house or flat.

This type of boiler is better for larger homes and larger families where the demand for water is likely to be higher.

System boilers use a cylinder that draws water from the mains, heats it and then keeps it warm. The cylinder stores a large amount of water, meaning that you should have hot water all day. To be certain of this, make sure that you program your boiler to draw and heat water to meet times when demand is greater, like first thing in the morning before you and your family members go to work or school, and for the evening when everyone gets home.

Unlike heat only boilers, you won't need to find room in your attic for a cold water storage tank - suitable if you don't have an attic, your attic space is very limited, or you are planning an attic conversion in the near future.

Is the Worcester Bosch Greenstar 4000 21kW system boiler from the Greenstar 4000 range a suitable choice for my house or flat?

Whether this Worcester Bosch Greenstar 4000 21kW System boiler is right for where you live 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 of a boiler is measured in kilowatts and indicates how much energy it can use to heat the water needed for your radiators, taps and showers. The greater the output, the more water it can heat.

A boiler whose output is too high will give you hot water and warm radiators but also higher gas bills, whereas a boiler whose output is too low will result in cheaper gas bills but the water might not always be as hot as you want it to be.

The output of the Worcester Bosch Greenstar 4000 21kW system is 21 kW, so which types of property would this model be appropriate for?

A PlumbProud Gas Safe boiler installer would recommend that the level of output from this Worcester Bosch Greenstar 4000 21kW System boiler would make it a suitable installation option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.


The size of the Worcester Bosch Greenstar 4000 21kW

The dimensions of the Worcester Bosch Greenstar 4000 21kW are 724 mm [H] x 400 mm [W] x 310 mm [D].

Is the Worcester Bosch Greenstar 4000 21kW condensing or non-condensing?

Is choosing the Worcester Bosch Greenstar 4000 21kW system boiler environmentally friendly?

As more of us are increasingly concerned about climate change, how we heat our homes and its impact on the environment has become an issue of importance to homeowners.

In the UK, central heating is responsible for 14% of greenhouse gas production. Domestic gas boilers emit large quantities of nitrogen dioxide in British cities.

Is the Worcester Bosch Greenstar 4000 21kW system an environmentally friendly choice for your home? Let’s have a look at the figures.

Under current UK law, all boilers must achieve a minimum energy efficiency level of 92% (a low to good SEDBUK "A" rating). The minimum level was raised from its previous 88% in April 2018.

Energy efficiency scores are intended to inform consumers of the amount of energy used and wasted when a boiler is in normal operation.

The Worcester Bosch Greenstar 4000 21kW was awarded an efficiency rating of 94% with a SEDBUK band rating of "A".

The Energy Related Products Directive (ERP) is European legislation that applies to all products which use or consume energy during their lifespan - this includes during the manufacturing process and when they're in use, right through to the point of final disposal.

The aim is to encourage manufacturers to create new products that are kinder to the environment and which create fewer harmful gas emissions.

The Worcester Bosch Greenstar 4000 21kW has an ERP Heat rating of "A".

Is there a warranty on the Worcester Bosch Greenstar 4000 21kW system boiler if it breaks down?

The Worcester Bosch Greenstar 4000 21kW boiler offers 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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