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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

Using factors such as price installed, manufacturer guarantees, energy efficiency and the likely cost of running, among others, this model has been rated as scoring 91.48% on the PlumbProud boiler benchmarking system.

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.

If you would like to get in touch with us for a free quote and professional guidance and advice on whether the Worcester Bosch Greenstar I 25i is the right choice for your home, you can do so by entering your postcode in the quote boxes on this page, calling us on 01604 343053 or you can click here to email us.


Installed price around

£2,100

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

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

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

Combi boilers were introduced by manufacturers in the 1970s to offer British homeowners a way to cheaply and reliably heat their homes and have hot water without taking up too much space. Previously, most boilers had one or more storage tanks, which either heated water and kept it warm or held water to be heated later.

With combi boilers, there is no need to find space for large tanks around your home as the hot water needed for your radiators and taps is available on demand. Combi boilers do this by drawing water from your mains supply, heating it instantly whenever you need it and then distributing it to where it's needed in the home.

The major disadvantage to combi boilers is that they have a maximum capacity for heating water. In a larger household, water pressure, volume and temperature will drop if two or more people are trying to use hot water at the same time.

Should I install a Worcester Bosch Greenstar I 25i combi boiler in 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.

Your boiler's output indicates the maximum amount of power available to it to heat the water you need to warm your radiators or when you want hot water from your taps. A higher output rate means that your boiler is capable of heating greater volumes of water.

If a boiler's output rate is too low, you'll often find that the water is not as hot as you want it to be. Too high, however, and you'll end up paying more for your gas than you should be.

The Worcester Bosch Greenstar I 25i combi boiler has an output rate of 25 kW, so which types of property would this be suitable for?

Most experienced boiler engineers would recommend this Worcester Bosch Greenstar i 25i Combi boiler as a suitable option for smaller homes and apartments with no more than up to 10 radiators and one bathroom.

You need to consider the flow rate as well as the output rate when choosing a combi boiler.

Flow rates, measured in litres per minute, indicate how much water your boiler can heat and distribute around your home at any given time. If your family regularly use hot water around the house at the same time and you have a lot of radiators, you should choose a boiler with a high flow rate. This Worcester Bosch Greenstar i 25i Combi boiler's flow rate is 10 L/m.

However, you also need to consider the flow rate of your local mains water supply. Combis can only draw water from the mains as fast as the pipes can deliver it. If you choose a boiler with a 14l/m flow rate and the mains pipes into your home have a flow rate of 12l/m, your boiler won't be able to operate at full capacity. In other words, try to make sure the local water pressure and your boiler flow rates are as close as possible.

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.


Where will the Worcester Bosch Greenstar I 25i fit in my house?

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

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

We recommend the Worcester Bosch Greenstar I 25i as it is a modern condensing gas boiler from a trusted manufacturer with a reputation for supplying highly energy-efficient boilers.

Condensing boilers capture the heat still present in water vapour condensation and flue exhaust gases and recycle it back into the heating system. With this extra energy, your boiler can, among other tasks, reheat colder water coming back from your radiators without having to burn more gas.

Condensing boilers significantly reduce your quarterly gas costs and they're better for the environment.

Does the Worcester Bosch Greenstar I 25i combi protect the environment?

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

Will choosing to install a Worcester Bosch Greenstar I 25i combi in your home help the environment? Let's review the figures.

All boilers manufactured and installed in the UK are required by law to have an energy efficiency rating of at least 92%, equivalent to a good “A” rating on the SEDBUK scale. Before this, the minimum was 88% (ratings of 88% and 89% are equivalent to a high “B” SEDBUK rating and anything 90% or higher is an "A" rating).

A boiler's energy efficiency rating is designed to let you know how much energy is used and wasted during normal functioning.

The Worcester Bosch Greenstar I 25i was given an efficiency rating of 90.1% and a band rating of "A".

In 2015, the Energy Related Products Directive (ERP) came into force. The legislation applies to all products that consume energy in production, during their active life, and at the point of final disposal.

The ERP was introduced to incentivise manufacturers to create products that emitted fewer harmful gases with the larger aim of protecting the wider environment.

The Worcester Bosch Greenstar I 25i has been awarded an ERP rating of "A" for heat and "A" for 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 7 year warranty for parts and labour.


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.

We estimate that, on a standard, non-complicated installation, the supply and fitting charge for this Worcester Bosch Greenstar i 25i Combi boiler will be around £2,100.

We offer free quotes and professional advice and guidance on whether the Worcester Bosch Greenstar I 25i is a suitable choice for your home via a phone call on 01604 343053. Alternatively, please click here to email us or enter your postcode in the quote boxes 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

Is the Worcester Bosch Greenstar I 25i a standard, combi or system boiler?

Looking for a gas combi boiler for your flat or house? Then the Worcester Bosch Greenstar I 25i may be an option you should consider.

The UK has some of the smallest homes in the Western world, which is partly why combi boilers were introduced in the 1970s. Traditional boilers require one or more large storage tanks which they use to either heat water and keep it warm or store water intended for heating later. These tanks took up a lot of space in people's homes.

Combi boilers save space because they don't require these tanks to operate. Instead, combis draw water direct from your mains supply then instantly heat and distribute it on demand.

The biggest disadvantage in using combi boilers is that they have a maximum capacity volume for heating water. While this may not be an issue in a small household, it could be for a larger household where there is higher demand for hot water. When more than one person is using the water, it is distributed between the two points, reducing the pressure and temperature at each point.

Is the Worcester Bosch Greenstar I 25i combi boiler suitable 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 - the "output".

The output of a boiler is measured in kilowatts. The output level determines the maximum power a boiler can use in heating the water needed for the baths, showers, taps and radiators in your home.

It's important to choose a boiler with an appropriate level of output for your property. Your boiler should be able to cope with periods of peak demand in your property and not just your average usage.

An output rate that is too low will result in an inadequate supply of hot water, while an output that is too high will mean the boiler will cost more to run than is necessary.

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

An experienced PlumbProud Gas Safe engineer would almost certainly recommend that this Worcester Bosch Greenstar i 25i Combi boiler would be most suitable for smaller homes and apartments with up to 10 radiators and one bathroom.

You also need to choose a combi boiler with the right flow rate for where you live.

A combi boiler's flow rate is the maximum volume of water (measured in litres per minute) that it can heat and distribute to your radiators, taps and showers at the same time. This Worcester Bosch Greenstar i 25i Combi boiler's flow rate is 10 L/m.

However, combi boilers like the Worcester Bosch Greenstar I 25i draw water directly from the mains and heat it instantly.

If your mains pressure is 12 litres per minute, your boiler can only heat and distribute hot water at a rate of 12 litres per minute even if it has a higher flow rate.

Combi boilers also struggle when multiple people in your home want to use hot water at the same time - for example, someone running the hot water tap in the kitchen and two people wanting to shower in separate bathrooms.

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.


Worcester Bosch Greenstar I 25i dimensions

The Worcester Bosch Greenstar I 25i's dimensions are 700 mm [H] x 400 mm [W] x 330 mm [D].

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

We recommend the Worcester Bosch Greenstar I 25i as it is a modern condensing gas boiler from a trusted manufacturer with a reputation for supplying highly energy-efficient boilers.

Condensing boilers capture the heat still present in water vapour condensation and flue exhaust gases and recycle it back into the heating system. With this extra energy, your boiler can, among other tasks, reheat colder water coming back from your radiators without having to burn more gas.

Condensing boilers significantly reduce your quarterly gas costs and they're better for the environment.

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

How we heat our homes is an issue which many homeowners worry about as the world combats climate change and environmental damage.

Nitrogen dioxide emissions in Britain's largest cities are at dangerous levels and this has been caused by gas boilers. In fact, 14% of the UK’s greenhouse gases are produced by central heating.

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

An energy efficiency rating of 92% or above is a legal requirement for all boilers manufactured and installed in the UK today. 92% is equivalent to a low-to-middle "A" grade on the "Seasonal Efficiency of Domestic Boilers" (SEDBUK) scale.

Energy efficiency measures how much energy a boiler uses and wastes in the course of its normal operation. The lower the waste, the lower your gas bills.

The Worcester Bosch Greenstar I 25i was awarded an efficiency rating of "90.1%", equivalent to a "A" rating on the SEDBUK system.

The ERP (or Energy Related Products Directive) is European legislation affecting products that consume energy throughout their lifetime.

The aim is to encourage companies to create environmentally friendlier products that reduce harmful gas emissions during manufacturing and when in use by the end client, right through to their eventual disposal.

In the case of the Worcester Bosch Greenstar I 25i, the ERP rating is "A" for heat and "A" for hot water production.

How long am I covered by the warranty for if the Worcester Bosch Greenstar I 25i breaks down?

The Worcester Bosch Greenstar I 25i boiler offers 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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