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Worcester Bosch Greenstar I 25i boiler

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Plumbproud rating

91.48%

Worcester Bosch Greenstar i 25i Combi Gas boiler

We have awarded this Worcester Bosch Greenstar i 25i Combi boiler a rating of 91.48% in our boiler quality benchmark tests. To determine a score for each boiler, we factor in several different points of comparison including energy efficiency, manufacturer guarantees, estimated running costs, price and more.

This Worcester Bosch Greenstar i 25i Combi boiler is likely to cost around £2,100 fully installed by PlumbProud if there are no unexpected complications during the fit.

You can get more information and a free quote for the Worcester Bosch Greenstar I 25i boiler by entering your postcode in the quote boxes on this page, clicking here to email us, or by giving us a call on 01604 343053.


Installed price around

£2,100

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Worcester Bosch Greenstar i 25i Combi Gas boiler frequently asked questions

Worcester Bosch Greenstar I 25i - a system boiler, regular boiler or combi boiler?

The Worcester Bosch Greenstar I 25i is a combi boiler you may wish to consider if you want this particular type of 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 a Worcester Bosch Greenstar I 25i combi boiler suitable for my house or flat?

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

A Gas Safe boiler installer would recommend that this Worcester Bosch Greenstar i 25i Combi boiler would provide adequate heating and hot water for smaller homes and apartments with up to up to 10 radiators and one bathroom.

You should also consider a combi boiler's "flow rate" when making your choice.

The flow rate indicates how much water it can take from the mains supply at any one time (measured in litres per minute), which it then heats and distributes to different points in your home like your bathroom, kitchen and radiators. This Worcester Bosch Greenstar i 25i Combi boiler's flow rate is 10 L/m.

Combi boilers have no storage tanks like system or heat only boilers. This means that if the water pressure where you live is low, there's no benefit in spending money on a combi with a high flow rate because a high flow rate doesn't mean it can draw any more water from the mains.

In addition, there might be lots of people in your household who want to use hot water at the same time while also having the central heating on. Given that average mains pressure in the UK is between 10 and 12 litres per second and a power shower usually requires about 12 litres of water per minute, a combi boiler might not be the right choice for you and your family.

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.


How large is the Worcester Bosch Greenstar I 25i?

The Worcester Bosch Greenstar I 25i measures 700 mm tall, 400 mm wide, and 330 mm deep.

Is the Worcester Bosch Greenstar I 25i non-condensing or condensing?

Condensing gas boilers like the Worcester Bosch Greenstar I 25i are environmentally friendlier and cheaper to run so, if possible, we strongly recommend that you choose this or one of the very latest models.

Condensing boilers are much more efficient and economical to run because they contain a secondary heat exchanger that captures and recycles the warmth still present in the flue exhaust gases and the water vapour condensation for re-use, meaning that they use less gas to run.

How environmentally friendly is the Worcester Bosch Greenstar I 25i combi?

As more of us become concerned by the effects of climate change, the damage we do to the environment by heating our homes has emerged as an important issue for many homeowners.

Central heating produces 14% of all greenhouse gas emissions in the UK. Gas boilers in the larger cities emit dangerous levels of nitrogen dioxide.

Is the Worcester Bosch Greenstar I 25i combi an environmentally friendly choice for your home? Let’s have a look at the figures.

Boilers manufactured and installed in the UK are assigned energy efficiency ratings following testing to an agreed set of standards. These scores indicate how much energy the boiler uses and how much goes to waste when it's in operation.

By law, boilers must achieve a SEDBUK rating of "A" subject to achieving a minimum of 92% energy efficiency. Prior to April 2018, the minimum was 88% (88% and 89% on the SEDBUK are graded "B" and 90% and above is graded "A").

The Worcester Bosch Greenstar I 25i was awarded an efficiency rating of 90.1% with a SEDBUK band rating of "A".

In 2015, new legislation was introduced by the EU to encourage manufacturers to develop more energy-efficient products that emit fewer harmful gases throughout their lifetime.

The Energy Related Products Directive (ERP) applies to all products that consume energy, including during the manufacturing process, at the point of final disposal, and all points in between.

The ERP rating of the Worcester Bosch Greenstar I 25i is "A" for heat and "A" for hot water.

If the Worcester Bosch Greenstar I 25i breaks down, will I be covered by the warranty?

The Worcester Bosch Greenstar I 25i boiler comes with a parts and labour warranty lasting 7 years.


Worcester Bosch Greenstar i 25i Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.1%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW25 kW
Height700 mm
Width400 mm
Depth330 mm
MountingWall
Flow rate10 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 I 25i boiler

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Worcester Bosch Greenstar i 25i Combi Gas boiler

  1. Home
  2. Worcester Bosch Greenstar i 25i
Plumbproud rating for this boiler
91.48%

On the PlumbProud boiler quality benchmark scoring system, we have rated this Worcester Bosch Greenstar i 25i Combi boiler at 91.48%. Ratings are determined by considering a number of important factors including the energy efficiency, price installed, warranty length, and running costs of the boiler.

You should budget around £2,100 for the supply and installation of this Worcester Bosch Greenstar i 25i Combi boiler by PlumbProud.

We recommend that you speak to our friendly advisors by calling 01604 343053 to seek professional advice on whether the Worcester Bosch Greenstar I 25i boiler is right for your home. Our team can also provide you with a free quotation for this Worcester Bosch Greenstar i 25i Combi boiler. Alternatively, click here to email us or enter your postcode into the quotation box on this page.


Installed price guideline
£2,100

Get your free quote

Worcester Bosch Greenstar i 25i Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.1%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW25 kW
Height700 mm
Width400 mm
Depth330 mm
MountingWall
Flow rate10 L/m
ERP HeatA
ERP WaterA

Worcester Bosch Greenstar i 25i Combi Gas boiler frequently asked questions

Which category of boiler does the Worcester Bosch Greenstar I 25i fit into?

The Worcester Bosch Greenstar I 25i may be worth considering if you are looking for a combi boiler for your house or flat.

Combination or combi boilers are highly efficient and save a lot of space in your home. Combi boilers heat water directly from the mains when you turn on a tap and, as a result, you don’t need a hot water storage cylinder or a cold water tank in the roof space.

These boilers are, therefore, suitable for smaller homes and especially those without a loft. They are also cost-effective as the water is heated instantly and distributed on demand rather than being stored. Combi boilers are the most popular type of boilers in the UK and replacing an older boiler with a new combi boiler will reduce your gas bills significantly.

However, there are downsides to this type of boiler. If you take a shower while someone else is using a tap, less water will reach each point of usage at lower rates of pressure and temperatures as combi boilers can only heat a certain volume of water at any given time.

Would the Worcester Bosch Greenstar I 25i combi be a suitable boiler for my house or flat?

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.

The output of a boiler is measured in kilowatts and tells you how much power it has available to heat the water it sends to your hot taps, showers and radiators. The greater the demand for hot water in your home, the larger the output you will need.

It is important to select a boiler with the optimal output rate. Choose one with too high an output and your gas bills will be too expensive. Choose one with too low an output and sometimes the water in your radiators and coming out of your taps will be barely lukewarm.

The output of the Worcester Bosch Greenstar I 25i combi is 25 kW kilowatts, so which types of property would this be most suitable for?

Most experienced heating engineers would likely recommend that, at this level of output, this Worcester Bosch Greenstar i 25i Combi boiler would be a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.

The Worcester Bosch Greenstar I 25i is a combi boiler, which that means that you need to take the flow rate (measured in litres per minute) into account as well as the output rate. This Worcester Bosch Greenstar i 25i Combi boiler's flow rate is 10 L/m.

Combis draw water from the mains, instantly heating and distributing it where it's needed - taps, radiators, bathrooms, and so on.

However, this means that the flow rate of a boiler may effectively be capped by the flow rate of the mains water supply. For example, if your mains pressure is 12l/m, that is the maximum flow rate that your boiler can achieve even if you choose a boiler with a flow rate of 18l/m.

In addition, if your home has more than one bathroom, a high number of radiators, and more than one member of your household wants to use hot water at the same time regularly, the flow rate of both the boiler and the mains water pressure may not be high enough.

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 is the size of the Worcester Bosch Greenstar I 25i?

The Worcester Bosch Greenstar I 25i is 700 mm [H] by 400 mm [W] by 330 mm [D] in size.

Greenstar I 25i – non-condensing or condensing?

We recommend that, if possible, you choose a condensing boiler like the Worcester Bosch Greenstar I 25i.

Condensing boilers are more energy-efficient. They achieve this efficiency by capturing the heat present in flue exhaust gases and water vapour condensation and recycling that heat to, for example, warm colder water coming back from your radiators.

By choosing the latest condensing boiler, you'll also notice a significant reduction in your gas bills, particularly if you're replacing a boiler more than 15 years old.

Is the Worcester Bosch Greenstar I 25i combi boiler environmentally friendly?

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.

Central heating produces 14% of all greenhouse gas emissions in the UK. Gas boilers in the larger cities emit dangerous levels of nitrogen dioxide.

Let's take a closer look at whether installing a Worcester Bosch Greenstar I 25i combi would be a good choice for the environment.

All boilers manufactured and installed in the UK are required to have an energy efficiency rating of 92% or above (or a good “A” SEDBUK rating). Before April 2018, when the law changed, the minimum energy efficiency level permissible was 88% (86-90% is a SEDBUK "B" rating and 90%+ is an "A" rating).

A boiler's energy efficiency rating indicates the amount of energy used and wasted during normal operational performance.

Following its assessment, the Worcester Bosch Greenstar I 25i was given an efficiency rating of 90.1% and a SEDBUK grading of "A".

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, right through to the point of final disposal.

The Worcester Bosch Greenstar I 25i has a rating of "A" for heat and "A" for hot water production.

Does a Worcester Bosch Greenstar I 25i combi boiler come with a warranty period?

The Worcester Bosch Greenstar I 25i is supplied with a parts and labour warranty of 7 years.


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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