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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

We have determined a rating of 90.81% for this Worcester Bosch Greenstar 4000 21kW System boiler using the PlumbProud quality benchmarking system. Factors used to score a boiler include its energy performance, how much it costs to run, the installation price, and how long the manufacturer's guarantee lasts.

You should budget approximately £2,200 for the supply and installation of this Worcester Bosch Greenstar 4000 21kW System boiler on a standard, non-complicated fit.

For a free, no-obligation quotation on this Worcester Bosch Greenstar 4000 21kW System boiler or for our professional advice on whether the Worcester Bosch Greenstar 4000 21kW is suitable for your property, please call 01604 343053, click here to email our team or enter your postcode into the quotation box on this page.


Installed price around

£2,200

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

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

The Worcester Bosch Greenstar 4000 21kW is worthy of consideration if you're looking for a system boiler for your flat or house.

If you choose a system boiler, you'll have to find somewhere to install a hot water cylinder too - they're normally located in an airing or landing cupboard. However, unlike regular boilers, they do not require a cold water tank to be fitted in the attic, making them suitable for homes with limited or no roof space or if you're planning a loft conversion in the future.

System boilers distribute the hot water to your taps and radiators using (often built-in) circulation pumps and are easier to install from scratch since they have one less component (the water tank) to consider.

System boilers also require programming to produce heat and hot water, so they cannot produce this instantly. Nonetheless, the cylinder keeps water hot for use later, so you don't have to wait as long as you set your timer and keep it on long enough to heat enough water.

Should I install a Worcester Bosch Greenstar 4000 21kW system boiler in my house or apartment?

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 Gas Safe boiler installer would say that this Worcester Bosch Greenstar 4000 21kW System boiler's level of output makes it suitable for installing in medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.


How big is the Worcester Bosch Greenstar 4000 21kW?

The Worcester Bosch Greenstar 4000 21kW occupies a space of 724 mm high by 400 mm wide and 310 mm deep.

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

Is the Worcester Bosch Greenstar 4000 21kW system a good choice 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.

In Britain's bigger cities, gas boilers, in particular, are responsible for dangerous levels of nitrogen dioxide emissions. Overall, 14% of all of the UK’s greenhouse gas production comes from heating our homes.

Do the available figures suggest that installing the Worcester Bosch Greenstar 4000 21kW system in your property would be an environmentally friendly choice?

All boilers manufactured in the UK from April 2018 must operate at a minimum level of energy efficiency of 92% ("A" rating on the SEDBUK scale). Before that, the minimum was 88% - boilers scoring 88/89% were given a SEDBUK "B" rating and 90% or above an "A" rating.

The energy efficiency score of a boiler indicates how much energy it uses and how much goes to waste when in use.

After its assessment, the Worcester Bosch Greenstar 4000 21kW was given an efficiency rating of 94% and a SEDBUK grading of "A".

The Energy Related Products (ERP) Directive is a European directive which applies to all products that consume energy over their lifetime.

It encourages companies to create products that are environmentally friendlier at all life cycle stages, including initial manufacturing and end use right through to final disposal, with the aim of reducing harmful gas emissions.

The Worcester Bosch Greenstar 4000 21kW is rated "A".

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

Worcester Bosch’s Greenstar 4000 21kW boiler includes a parts and labour warranty of 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%

On the PlumbProud boiler quality benchmark scoring system, we have rated this Worcester Bosch Greenstar 4000 21kW System boiler at 90.81%. Ratings are determined by considering a number of important factors including the energy efficiency, price installed, warranty length, and running costs of the boiler.

On most non-complicated installations, we would expect this Worcester Bosch Greenstar 4000 21kW System boiler to cost £2,200 including installation if you choose PlumbProud to do the work.

You can speak to our friendly and professional advisors by calling 01604 343053. They can provide you with a free quotation on the Worcester Bosch Greenstar 4000 21kW boiler and confirm that it is suitable for your home. You can also click here to email us or 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

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

The Worcester Bosch Greenstar 4000 21kW may be worth considering if you are looking for a system boiler for your house or flat.

System boilers work similarly to heat only boilers in that they need a hot water cylinder (usually installed in the home’s airing or landing cupboard) to operate. Unlike heat only boilers though, system boilers don’t require a separate cold-water tank, making them a more suitable choice in homes with little or no attic space or where homeowners are planning a loft conversion in the future.

Instead of large cold-water tanks, system boilers use built-in circulating pumps to provide hot water to your taps and radiators. This makes them easier to install from scratch as they have one less component to find room for and fit.

System boilers need to be programmed with the time you want heat and hot water - they don't offer hot water on demand like combi boilers.

Is a Worcester Bosch Greenstar 4000 21kW system boiler suitable 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 "output" level. Size does not mean its physical dimensions - it means how powerful it is.

The output level of a boiler tells you how much power it has to heat the water coming from your taps and warming up your radiators. The higher the output level, the greater the volume of water it can heat up.

If the output (measured in kilowatts) is too high, you'll pay higher gas bills and your water will be piping hot. Too low and the water coming out of your taps and being fed into your radiators will often be lukewarm.

The Worcester Bosch Greenstar 4000 21kW system outputs at a maximum of 21 kW, so which types of property would this Worcester Bosch Greenstar 4000 21kW System boiler be appropriate for?

A PlumbProud heating engineer would likely recommend that this Worcester Bosch Greenstar 4000 21kW System boiler is suitable for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.


What are the proportions of a Worcester Bosch Greenstar 4000 21kW boiler?

The dimensions of the Worcester Bosch Greenstar 4000 21kW are 724 mm tall, 400 mm wide, and 310 mm deep.

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

Is the system Worcester Bosch Greenstar 4000 21kW boiler energy efficient?

With growing concern among the public about accelerating climate change, how we heat our homes and the impact this has on the environment has become a major topic of concern for many homeowners.

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.

Is the Worcester Bosch Greenstar 4000 21kW 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 21kW 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).

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 21kW has an ERP rating of "A".

What is the length of the warranty on the Worcester Bosch Greenstar 4000 21kW?

The Worcester Bosch Greenstar 4000 21kW is supplied with 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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