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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

According to our PlumbProud boiler quality scoring system, we rate this model 90.86%. We rank boilers using a number of different factors including price installed, manufacturer guarantees, energy efficiency, likely running costs, and more.

On a standard fit, we would expect this Worcester Bosch Greenstar Si Compact 30Si Combi boiler to cost you £2,200 supplied and fully installed by an experienced Gas Safe PlumbProud fitter.

To contact us, please enter your postcode in the quote boxes on this page, click here to email us, or give us a call on 01604 343053. We can provide you with a free quote on the Worcester Bosch Greenstar Si Compact 30Si boiler and offer professional advice and guidance on whether this Worcester Bosch Greenstar Si Compact 30Si Combi boiler is the right choice for your home.


Installed price around

£2,200

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

What kind of boiler is the Worcester Bosch Greenstar Si Compact 30Si - standard, combi or system?

If you are searching for a combi boiler for your house or flat, the Worcester Bosch Greenstar Si Compact 30Si is certainly one to consider.

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.

Should I choose a Worcester Bosch Greenstar Si Compact 30Si combi boiler for my house or flat?

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".

Your boiler should be able to cope with peak hot water demand in your property and not just your average hot water usage. The output rate of a boiler is measured in kilowatts and tells you how much power a boiler can use to provide hot water to your taps, showers and radiators.

If the output of your boiler is too low, there will often be times when your water isn't as hot as you want. But if your boiler output is too high, it will be more costly to run (often unnecessarily).

The output of the Worcester Bosch Greenstar Si Compact 30Si combi boiler is 30 kW kilowatts. Which types of property would this be appropriate for?

Most heating engineers would recommend this Worcester Bosch Greenstar Si Compact 30Si Combi boiler as a suitable option for 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.


What are the proportions of a Worcester Bosch Greenstar Si Compact 30Si boiler?

Worcester Bosch’s Greenstar Si Compact 30Si is 690 mm tall, 390 mm wide, and 280 mm deep.

Is the Worcester Bosch Greenstar Si Compact 30Si non-condensing or condensing?

We always recommend to clients that they select the very latest condensing boiler for their home.

Condensing boilers like the Worcester Bosch Greenstar Si Compact 30Si are more efficient with the gas they use in operation, meaning that you'll benefit from lower fuel bills. Condensing boilers are also better for the environment.

They achieve their efficiency by capturing and recycling the heat still present in the water vapour condensation and flue exhaust gases created when a boiler burns gas to get the energy it needs. It then reuses that recycled heat to perform a number of tasks, including heating the colder water that comes back to your boiler via the radiator.

Does the Worcester Bosch Greenstar Si Compact 30Si combi protect the environment?

As more of us are increasingly concerned about climate change, how we heat our homes and its impact on the environment has become an issue of importance to homeowners.

Central heating creates 14% of the UK’s greenhouse gases. And in Britain's larger cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Do the available figures suggest that installing the Worcester Bosch Greenstar Si Compact 30Si combi in your property would be an environmentally friendly choice?

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 Si Compact 30Si was given an efficiency rating of 90.5% and a band rating of "A".

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 Si Compact 30Si, the ERP rating is "A" for heat and "A" for hot water production.

Is this Worcester Bosch Greenstar Si Compact 30Si combi covered by a warranty?

The Worcester Bosch Greenstar Si Compact 30Si is supplied with a parts and labour warranty of 7 years.


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%

We have determined a rating of 90.86% for this Worcester Bosch Greenstar Si Compact 30Si 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.

This Worcester Bosch Greenstar Si Compact 30Si Combi boiler is likely to cost around £2,200 fully installed by PlumbProud if there are no unexpected complications during the fit.

We offer free quotes and professional advice and guidance on whether the Worcester Bosch Greenstar Si Compact 30Si 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
£2,200

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

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

If you are searching for a combi boiler for your house or flat, the Worcester Bosch Greenstar Si Compact 30Si is certainly one to consider.

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.

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

Whether this Worcester Bosch Greenstar Si Compact 30Si Combi 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 Si Compact 30Si combi outputs at a maximum of 30 kW, so which types of property would this Worcester Bosch Greenstar Si Compact 30Si Combi boiler be appropriate for?

A boiler engineer would be likely to recommend that this Worcester Bosch Greenstar Si Compact 30Si Combi boiler is capable of providing heating and hot water to 10-15 radiators and two bathrooms and would therefore be most suitable for medium-sized homes and larger apartments.

With combi boilers, you need to consider the flow rate as well as the output rate. The flow rate (shown in litres per minute) measures how much water your boiler can draw from the mains which it then instantly heats and distributes to your taps and radiators.

However, a high flow rate is of little to no value if your local water pressure is low. If your local mains water pressure is 10l/m and your flow rate is 12l/m, your boiler will only be able to process 10l/m.

If you live in an area with high water pressure but your household has multiple bathrooms and/or radiators and many members of your household want to use hot water at the same time (like morning or evening baths or showers), it's unlikely that you'll be able to find a combi with a high enough flow rate.

As an indication, a power shower needs about 10 litres of water per minute, whereas the flow rate of this Worcester Bosch Greenstar Si Compact 30Si Combi boiler is 12 L/ml/m.

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 a Worcester Bosch Greenstar Si Compact 30Si boiler?

The Worcester Bosch Greenstar Si Compact 30Si measures 690 mm tall, 390 mm wide, and 280 mm deep.

Is the Worcester Bosch Greenstar Si Compact 30Si condensing or non-condensing?

We recommend that, if possible, you select one of the very latest condensing gas boilers on the market like the Worcester Bosch Greenstar Si Compact 30Si.

Condensing boilers are better for the environment because they capture and recycle the heat still present in flue exhaust gases and water vapour condensation for re-use, meaning lower greenhouse gas emissions.

They're also a lot cheaper to run meaning that, if you're replacing a very old and inefficient boiler, the savings on your gas bill over 5-10 years add up to more than you pay for the boiler itself.

How does the Worcester Bosch Greenstar Si Compact 30Si combi boiler rate environmentally?

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.

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.

Will you be helping the environment if you decide to install a Worcester Bosch Greenstar Si Compact 30Si combi in your home? Let’s 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 Si Compact 30Si was awarded an efficiency rating of 90.5% with a SEDBUK band rating of "A".

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 Si Compact 30Si, the ERP rating is "A" for heat and "A" for hot water production.

What is the warranty period for the Worcester Bosch Greenstar Si Compact 30Si?

The parts and labour warranty on the Worcester Bosch Greenstar Si Compact 30Si lasts 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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