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Worcester Bosch Greenstar 4000 25kW boiler

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  2. Worcester Bosch Greenstar 4000 25kW
Plumbproud rating

91.41%

Worcester Bosch Greenstar 4000 25kW Combi Gas boiler

This Worcester Bosch Greenstar 4000 25kW Combi boiler has been rated at 91.41%. Our PlumbProud boiler quality rating system uses price installed, energy efficiency, likely running costs, the manufacturer's warranty and other factors to determine the rating we give.

This Worcester Bosch Greenstar 4000 25kW Combi boiler will cost around £2,100 fitted through PlumbProud where there are no complications during the installation.

Get a better understanding of installation costs for the Worcester Bosch Greenstar 4000 25kW by entering your postcode in the box supplied on this page. You can also call our professional team with any boiler-related queries on 01604 343053. Alternatively, please click here to email us.


Installed price around

£2,100

GET A COMPETITIVE BOILER QUOTE

Please enter your postcode below to get a personalised quotation for the perfect boiler for your home

Worcester Bosch Greenstar 4000 25kW Combi Gas boiler frequently asked questions

Is the Worcester Bosch Greenstar 4000 25kW a combi boiler, system boiler or regular boiler?

Suitable for a house or a flat, the Worcester Bosch Greenstar 4000 25kW combi boiler is worth considering if you want a combi boiler.

Boilers traditionally required the installation of one or more large tanks around your property. These were filled with water that was either being heated or was to be heated later. British homes are among the smallest in the world so, to solve the space problem, manufacturers introduced combi boilers in the 1970s to offer homeowners the warmth and hot water supply they needed while taking up much less space.

A combi boiler is designed to heat both radiators and taps on demand and at the same time. Water from the mains passes through a combi boiler and the boiler's technology instantly turns it into hot water. Your boiler then distributes the hot water throughout your home.

The main disadvantage of combi boilers is that they have a maximum water volume capacity. What this means is that, if one person is using the shower while another uses a hot tap simultaneously, less water gets to each area, resulting in a fall in water pressure at both points.

Would the Worcester Bosch Greenstar 4000 25kW combi boiler be suitable for my house or flat?

It's best to choose a boiler whose size or "output" is right for your home.

The more hot water and heat you want, the higher the output level of your boiler should be. Output is measured in kilowatts and it describes the maximum level of power your boiler has to heat water.

If your output level is too low, your boiler will not have the power it needs to get your water as hot as you want it, particularly when there's a lot of demand for it. Choose a boiler whose output level is too high and you'll have all the hot water you need but will be paying too much for it through higher gas bills.

Which types of property would this Worcester Bosch Greenstar 4000 25kW Combi boiler be appropriate for given its output of 25 kW?

An experienced heating engineer would say that this Worcester Bosch Greenstar 4000 25kW Combi boiler's level of output makes it a suitable installation for smaller homes and apartments with up to 10 radiators and one bathroom.

Flow rates are important when choosing a combi boiler as well as output rates.

A combi boiler's flow rate (measured in litres per minute) describes how much water it can instantly heat then distribute to the taps and radiators in your home - you will need to factor this into your decision on a new combi boiler. This Worcester Bosch Greenstar 4000 25kW Combi boiler's flow rate is 9 L/m.

If you have a lot of radiators and bathrooms in your home and there's lots of demand within your household for hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate.

However, it's not quite that simple. If your local mains water pressure is low, you're not going to gain any benefit from choosing a combi boiler with a high flow rate because that higher flow rate doesn't mean it can draw more water from the mains pipes.
When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.


What size is a Worcester Bosch Greenstar 4000 25kW boiler?

The Worcester Bosch Greenstar 4000 25kW has the following dimensions - 724 mm high, 400 mm wide, and 310 mm deep.

Greenstar 4000 25kW – condensing or non-condensing?

Is the Worcester Bosch Greenstar 4000 25kW combi boiler good for the environment?

The effects of climate change on the environment are leading many homeowners to question the damage they might be doing by the way they heat their homes.

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.

Would the environmental impact of installing a Worcester Bosch Greenstar 4000 25kW combi in your home be positive? Let's look at the numbers.

In the UK, by law, all boilers manufactured since April 2018 must have a SEDBUK “A” rating and operate to a minimum level of 92% energy efficiency. Prior to this, the minimum was 88% – 88/89% would score a "B" and 90% or more an "A" on the SEDBUK scale.

The energy efficiency rating measures the amount of energy a boiler consumes when it's in use and how much it loses on non-core operations.

Following testing, the Worcester Bosch Greenstar 4000 25kW was given an efficiency rating of 94% and a SEDBUK grading of "A".

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), the aim of which was to ensure that all manufacturers, including boiler manufacturers, developed more efficient products and processes.

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

The Worcester Bosch Greenstar 4000 25kW has been given an ERP rating of "A" for heat and "A" for water.

Am I covered if the Worcester Bosch Greenstar 4000 25kW combi boiler breaks down?

You receive a parts and labour warranty of 7 years with the Worcester Bosch Greenstar 4000 25kW boiler.


Worcester Bosch Greenstar 4000 25kW Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW25 kW
Height724 mm
Width400 mm
Depth310 mm
MountingWall
Flow rate9 L/m
ERP HeatA
ERP WaterA

The top 10 rated Gas Combi boilers

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

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%

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Worcester Bosch Greenstar 4000 25kW boiler

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Worcester Bosch Greenstar 4000 25kW Combi Gas boiler

  1. Home
  2. Worcester Bosch Greenstar 4000 25kW
Plumbproud rating for this boiler
91.41%

We have determined a rating of 91.41% for this Worcester Bosch Greenstar 4000 25kW Combi boiler on the PlumbProud quality scoring system. The rating is determined using a variety of important factors including price installed, manufacturer guarantees, energy efficiency and the likely cost of running.

We would anticipate that this Worcester Bosch Greenstar 4000 25kW Combi boiler would cost you £2,100 fully installed through PlumbProud provided that the fitting is standard and with no complications.

For a free quote on the Worcester Bosch Greenstar 4000 25kW 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 guideline
£2,100

Get your free quote

Worcester Bosch Greenstar 4000 25kW Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating94%
Band ratingA
P/L Warranty7 Years
Output in kW25 kW
Height724 mm
Width400 mm
Depth310 mm
MountingWall
Flow rate9 L/m
ERP HeatA
ERP WaterA

Worcester Bosch Greenstar 4000 25kW Combi Gas boiler frequently asked questions

Worcester Bosch Greenstar 4000 25kW - a system boiler, regular boiler or combi boiler?

The Worcester Bosch Greenstar 4000 25kW boiler is a combi boiler you may wish to consider when looking for a new boiler for your house or flat.

Combi boilers are excellent for providing hot water and heat for your radiators just when you need it. When you have a combi boiler installed in your home, you just turn on the tap and the hot water for your bath, shower, washing dishes and other activities is there when you need it. It also provides the heat you need to keep your radiators warm.

A combi boiler heats the cold water passing through it, which it draws from the mains. This newly heated water can then be distributed to whichever hot tap or radiator needs it.

In the past, boilers needed at least one storage tank to hold water that was either already heated or would be heated later. Sometimes, you'd have to wait for hot water because there was none left. In addition, storage tanks took up a lot of space and most UK homes are pretty small.

The main disadvantage to combi boilers is that they can only heat a certain amount of water at any one time, meaning the pressure, volume and temperature of water will decrease if more than one tap is on at the same time or if both the shower and washing machine are on together.

Is the Worcester Bosch Greenstar 4000 25kW combi boiler suitable for my house or apartment?

To determine that, we need to consider the size of the boiler. Size doesn't mean how big it is - it means how big its "output" is.

The output rate of a boiler tells you how much power it has available to it for heating the water that comes out of your taps and warms your radiators. A higher output rate means that your boiler has more power at its disposal.

You need to make sure you select a boiler with the right output rate. That's because, if your output rate is too high, then your boiler will have more power than it needs but it will cost too much to run. If the output rate is too low, your water may often not be hot enough.

The Worcester Bosch Greenstar 4000 25kW combi's output is 25 kW, so which types of property would this Worcester Bosch Greenstar 4000 25kW Combi boiler be appropriate for?

A Gas Safe engineer would recommend that the Worcester Bosch Greenstar 4000 25kW combi boiler is a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.

Flow rates are important when choosing a combi boiler as well as output rates.

A combi boiler's flow rate (measured in litres per minute) describes how much water it can instantly heat then distribute to the taps and radiators in your home - you will need to factor this into your decision on a new combi boiler. This Worcester Bosch Greenstar 4000 25kW Combi boiler's flow rate is 9 L/m.

If you have a lot of radiators and bathrooms in your home and there's lots of demand within your household for hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate.

However, it's not quite that simple. If your local mains water pressure is low, you're not going to gain any benefit from choosing a combi boiler with a high flow rate because that higher flow rate doesn't mean it can draw more water from the mains pipes.
When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.


The dimensions of the Worcester Bosch Greenstar 4000 25kW are

The Worcester Bosch Greenstar 4000 25kW is 724 mm in height, 400 mm in width and 310 mm in depth.

Greenstar 4000 25kW – condensing or non-condensing?

Is the Worcester Bosch Greenstar 4000 25kW combi boiler an environmentally friendly choice?

How we heat our homes and the effect that has on climate change has become important to many homeowners worried about the environment.

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.

Would choosing a Worcester Bosch Greenstar 4000 25kW combi help in the fight against climate change? What do the performance statistics suggest?

All boilers manufactured and supplied in the UK must achieve an energy efficiency rating of at least 92% (an "A" SEDBUK grade). This is higher than the previous 88%, which was a legal requirement prior to April 2018.

The energy efficiency rating is used to work out how much energy a boiler both uses and wastes when it's switched on and working correctly - its standard functioning and operation.

The Worcester Bosch Greenstar 4000 25kW is rated as 94% energy efficient, equivalent to a "A" SEDBUK rating.

The Energy Related Products Directive (ERP) was introduced in 2015 and it 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 25kW has an ERP rating of "A" for heat and "A" for hot water production.

If the Worcester Bosch Greenstar 4000 25kW combi boiler breaks down, am I covered?

Worcester Bosch offers a parts and labour warranty of 7 years on the Worcester Bosch Greenstar 4000 25kW.


The top 10 rated Gas Combi boilers

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

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%
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