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Worcester Bosch Greenstar Si Compact 30Si boiler

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Plumbproud rating

90.86%

Worcester Bosch Greenstar Si Compact 30Si Combi Gas boiler

We score this Worcester Bosch Greenstar Si Compact 30Si Combi boiler as 90.86% on the PlumbProud quality scoring system. Our rating is based on various factors, including the installation price, the length of the manufacturer's warranty, and the expected energy efficiency and operating costs.

You should budget around £2,200 for the supply and installation of this Worcester Bosch Greenstar Si Compact 30Si Combi boiler by PlumbProud.

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 Si Compact 30Si 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

£2,200

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Worcester Bosch Greenstar Si Compact 30Si Combi Gas boiler frequently asked questions

Is the Worcester Bosch Greenstar Si Compact 30Si a combi, system or regular boiler?

If you are considering installing a combi boiler in your house or flat, then the Worcester Bosch Greenstar Si Compact 30Si boiler is certainly worth investigating.

Combi boilers have much to recommend them - not least the fact that they save a lot of space. Combination (or combi) boilers were introduced by manufacturers in the 1970s to provide practical central heating and hot water distribution to smaller properties - remember that UK houses and flats tend to be among the smallest in the developed world.

Traditional boilers require one or more storage tanks to keep hot water warm and to store water for heating later. In contrast, combi boilers draw water directly from the mains supply and heat it instantly, removing the need for a storage tank. The heated water is then distributed to your taps and radiators on demand.

While combi boilers are suitable choices for many properties, especially those without a loft, there is also a disadvantage in using them. Water is heated instantly and the volume of water that can be heated at any one time is limited. This can result in less water being sent to taps and showers if more than one is being used simultaneously. In these instances, the water pressure to both points will drop.

Is the Worcester Bosch Greenstar Si Compact 30Si combi boiler the right choice for my house or apartment?

You should make sure that the boiler you install in your property is the right "size". And size doesn't mean its physical dimensions, size means how much power it has - the "output".

Output measures in kilowatts how much power a boiler can use when heating water for your radiators or taps. The higher the output rate, the more water it can heat.

If the output rate is too low, your hot water might often be only lukewarm, and if it is too high, you will be paying more for your gas than you need to.

The Worcester Bosch Greenstar Si Compact 30Si combi boiler has an output of 30 kW, so which types of property would it be most appropriate for?

Most experienced heating engineers would suggest that the most suitable type of property for installing a Worcester Bosch Greenstar Si Compact 30Si combi boiler in would be medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

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 Si Compact 30Si Combi boiler's flow rate is 12 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.


Worcester Bosch Greenstar Si Compact 30Si size

The Worcester Bosch Greenstar Si Compact 30Si's dimensions are 690 mm [H] x 390 mm [W] x 280 mm [D].

Greenstar Si Compact 30Si – condensing or non-condensing?

Condensing gas boilers like the Worcester Bosch Greenstar Si Compact 30Si 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.

What energy efficiency ratings have been awarded to the Worcester Bosch Greenstar Si Compact 30Si combi?

With environmental issues in the spotlight, more and more homeowners are becoming concerned about how they heat their homes and how much they're contributing towards combatting climate change.

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.

Will choosing a Worcester Bosch Greenstar Si Compact 30Si combi boiler for your home be positive for the environment? Let's examine the figures.

The energy efficiency rating of the Worcester Bosch Greenstar Si Compact 30Si is 90.5% 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).

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 Si Compact 30Si has been given an ERP rating of "A" for heat and "A" for water.

Is there a warranty on the Worcester Bosch Greenstar Si Compact 30Si combi boiler if it breaks down?

You receive a parts and labour warranty of 7 years with the Worcester Bosch Greenstar Si Compact 30Si boiler.


Worcester Bosch Greenstar Si Compact 30Si Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.5%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW30 kW
Height690 mm
Width390 mm
Depth280 mm
MountingWall
Flow rate12 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 Si Compact 30Si Combi Gas boiler

  1. Home
  2. Worcester Bosch Greenstar Si Compact 30Si
Plumbproud rating for this boiler
90.86%

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 90.86% on the PlumbProud boiler benchmarking system.

You should budget approximately £2,200 for the supply and installation of this Worcester Bosch Greenstar Si Compact 30Si Combi boiler on a standard, non-complicated fit.

To get a free quote for the installation of the Worcester Bosch Greenstar Si Compact 30Si boiler in your home, simply enter your postcode in the box provided on this page. You can also find out whether this is the right boiler for your home by clicking to email our installation team or by calling us on 01604 343053.


Installed price guideline
£2,200

Get your free quote

Worcester Bosch Greenstar Si Compact 30Si Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.5%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW30 kW
Height690 mm
Width390 mm
Depth280 mm
MountingWall
Flow rate12 L/m
ERP HeatA
ERP WaterA

Worcester Bosch Greenstar Si Compact 30Si Combi Gas boiler frequently asked questions

Is the Worcester Bosch Greenstar Si Compact 30Si a system, regular or combi boiler?

The Worcester Bosch Greenstar Si Compact 30Si may be worth considering if you are looking for a combi boiler for your house or flat.

Traditional boilers need one or more large tanks to work - one to heat and keep water warm for immediate use and the other to store water intended for heating later. Finding space for these large tanks is difficult in British residential property - remember that our houses and flats are among the smallest in the world. This is the problem that combi boilers were designed to solve when they were introduced in the 1970s.

Combi boilers don't need a tank - instead, they instantly heat water drawn from the mains using technology inside the boiler. This hot water is then distributed immediately to your taps or radiators on demand.

The biggest disadvantage to combi boilers is that they have a maximum capacity for heating water, meaning that they work best when only one point within a household wants hot water. For example, if someone is taking a shower and another person uses a hot water tap at the same time, the water pressure, volume and temperature to both points drops.

Should I install a Worcester Bosch Greenstar Si Compact 30Si 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.

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 Si Compact 30Si combi's output is 30 kW, so which types of property would this Worcester Bosch Greenstar Si Compact 30Si Combi boiler be appropriate for?

A PlumbProud heating engineer would likely recommend that this Worcester Bosch Greenstar Si Compact 30Si Combi boiler is suitable for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

Please remember too that all combi boilers draw water from the mains - they have no storage tanks. Combis heat the water from the mains on demand and then send it to wherever it's needed in the house, like a radiator, a bathroom or a kitchen.

The speed at which it can do this is called the "flow rate", which is measured in litres per minute. If you have a lot of radiators and bathrooms in your home and multiple people are regularly trying to use the hot water at one time, such as in the morning or evening, you'll need a combi with a high flow rate. This Worcester Bosch Greenstar Si Compact 30Si Combi boiler's flow rate is 12 L/m.

However, it's not that simple. Combis can only draw water from the mains at the speed it's delivered. If the flow rate of the local water supply is 11l/m, you shouldn't purchase a boiler with a flow rate of 17l/m because it will never be able to use that extra capacity.

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 are the dimensions of the Worcester Bosch Greenstar Si Compact 30Si boiler?

The dimensions of the Worcester Bosch Greenstar Si Compact 30Si are 690 mm tall, 390 mm wide, and 280 mm deep.

Is this Worcester Bosch boiler condensing or non-condensing?

The Worcester Bosch Greenstar Si Compact 30Si is a condensing gas boiler - we strongly recommend that you choose one of the latest condensing models if possible.

With a condensing boiler, you save money on your gas bills because your boiler captures and recycles the heat present in the flue exhaust gases and water vapour condensation for re-use, meaning they operate far more economically and efficiently.

Is the Worcester Bosch Greenstar Si Compact 30Si combi environmentally friendly?

With so many of us worried about the environmental impact of our personal choices, the relationship between how we heat our homes and climate change has become an important issue 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.

Would the environmental impact of installing a Worcester Bosch Greenstar Si Compact 30Si combi in your home be positive? Let's look at the numbers.

By law, boilers manufactured and supplied in the UK must achieve a SEDBUK rating of "A" and work at a 92% minimum efficiency. Before April 2018, a minimum of 88% energy efficiency needed to be achieved (88/89% = SEDBUK "B" and 90% = SEDBUK "A").

Following official testing, the Worcester Bosch Greenstar Si Compact 30Si was given an efficiency rating of 90.5% with a SEDBUK rating of "A".

Energy efficiency is a measure of how much energy is used and how much is wasted when a boiler is operating.

All products that consume energy throughout their lifespan must comply with the Energy Related Products (ERP) Directive.

Companies are legally obliged to reduce harmful gas emissions at all stages of a product's life cycle, from initial manufacturing right through to final disposal as well as when the product is in actual use.

The Worcester Bosch Greenstar Si Compact 30Si scores "A" for heat and "A" for water.

What warranty does the Worcester Bosch Greenstar Si Compact 30Si combi boiler come with?

The parts and labour warranty offered with this Worcester Bosch Greenstar Si Compact 30Si Combi boiler covers you for 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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