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Worcester Bosch Greenstar CDi Compact 28 boiler

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Plumbproud rating

92.57%

Worcester Bosch Greenstar CDi Compact 28 Combi Gas boiler

We have rated this Worcester Bosch Greenstar CDi Compact 28 Combi boiler at 92.57% using the PlumbProud quality scoring system. To determine a rating, we weigh up a number of important considerations including the energy efficiency, estimated running costs, manufacturer's warranty, price of the boiler and more.

We would expect that, unless there are complications during fitting, this Worcester Bosch Greenstar CDi Compact 28 Combi boiler would cost £2,000 supplied and professionally installed through PlumbProud.

Wondering if the Worcester Bosch Greenstar CDi Compact 28 is the right boiler for your home? Then speak to a professional here by getting in touch via email or call us on 01604 343053. You can also get a free quote by entering your postcode in the box on the page.


Installed price around

£2,000

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Worcester Bosch Greenstar CDi Compact 28 Combi Gas boiler frequently asked questions

Is the Worcester Bosch Greenstar CDi Compact 28 boiler a combi, system or regular boiler?

If you want a combi boiler for your flat or house, the Worcester Bosch Greenstar CDi Compact 28 might be an option for you to consider.

In older British homes, traditional boilers required you to find room for one or more storage tanks. One tank would keep hot water warm and the other stored cold water for later heating. Manufacturers introduced combi boilers to the UK in the 1970s so that homeowners could get the warmth and hot water they needed without having to sacrifice too much valuable space – remember that residential property in this country is among the smallest in the Western world.

Combi boilers deliver hot water to your radiators and taps using water they draw directly from the mains supply. As mains water travels through a combi boiler, the technology within it heats the cold water instantly and on demand. The hot water is then distributed throughout your house.

Combi boilers have one drawback, however: they can only heat a certain amount of water within a given time. For example, if someone uses the shower and another person uses the hot water tap at the same time, water pressure drops because water reaches each point differently.

Would the Worcester Bosch Greenstar CDi Compact 28 combi boiler be suitable for my house or flat?

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

This Worcester Bosch Greenstar CDi Compact 28 Combi boiler gets its power from gas and the power it's capable of producing is measured in kilowatts - the output rate is actually a kilowatt rate. The higher the output rate, the more kilowatts a boiler can use when heating water.

If you choose a boiler whose output rate is too low, it may not have enough power to make your water as hot as you would like. If you choose a boiler whose output rate is too high, you won't have to put up with lukewarm water but you will face higher gas bills.

The Worcester Bosch Greenstar CDi Compact 28 combi boiler has an output level of 28 kW, so which types of property would it be appropriate for?

A PlumbProud heating engineer would likely recommend that this Worcester Bosch Greenstar CDi Compact 28 Combi boiler is suitable for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

With all combi boilers, the "flow rate" (measured in litres per minute) is as important a consideration as output rate when choosing which model to go for. This Worcester Bosch Greenstar CDi Compact 28 Combi boiler's flow rate is 11 L/m.

Like all combi boilers, the Worcester Bosch Greenstar CDi Compact 28 draws water from the mains. It instantly heats that water and then distributes it to the parts of your home which need it - taps, radiators, bathrooms, and so on.

However, the water in the mains pipe that feeds your boilers has its own flow rate - normally between 10 and 12l/m. So if you choose a combi with a flow rate of 14l/m but local water pressure is equivalent to 11l/m, your boiler will actually operate at 11l/m - below its capacity.

In addition, if different family members want hot water at the same time (like for regular morning and evening showers) and your boiler has to provide hot water to your radiators at the same time, a combi boiler may not be suitable.

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 the Worcester Bosch Greenstar CDi Compact 28 boiler?

The Worcester Bosch Greenstar CDi Compact 28 boiler measures 680 mm [H] x 390 mm [W] x 280 mm [D] in size.

Greenstar CDi Compact 28 – condensing or non-condensing?

The Worcester Bosch Greenstar CDi Compact 28 is a condensing gas boiler - this is the type of boiler we recommend to most clients because they're better for the environment and they will save money on annual fuel bills.

A condensing boiler captures and recycles the warmth still present in both the flue exhaust gases and water vapour condensation created when gas is burned to provide your boiler with power.

This means it needs less gas to operate and it uses this extra energy to perform a number of tasks, including heating the colder water that comes back to the boiler from the radiators in your home.

Is the Worcester Bosch Greenstar CDi Compact 28 combi boiler an environmentally friendly choice?

Many homeowners are becoming increasingly concerned about how they heat their homes and the impact it has on climate change and other important environmental issues.

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.

If you decide to install a Worcester Bosch Greenstar CDi Compact 28 combi in your home, will you be helping the environment with your choice? 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 CDi Compact 28 was awarded an efficiency rating of 90.5% with a SEDBUK band rating of "A".

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 CDi Compact 28 scores "A" for heat and "A" for water.

How long is the warranty offered by the manufacturer for the Worcester Bosch Greenstar CDi Compact 28 boiler?

The Worcester Bosch Greenstar CDi Compact 28 is supplied with a parts and labour warranty of 7 years.


Worcester Bosch Greenstar CDi Compact 28 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.5%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW28 kW
Height680 mm
Width390 mm
Depth280 mm
MountingWall
Flow rate11 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 CDi Compact 28 Combi Gas boiler

  1. Home
  2. Worcester Bosch Greenstar CDi Compact 28
Plumbproud rating for this boiler
92.57%

We have determined a rating of 92.57% for this Worcester Bosch Greenstar CDi Compact 28 Combi boiler using the PlumbProud quality benchmarking system. Factors used to score a boiler include its energy performance, how much it costs to run, the installation price, and how long the manufacturer's guarantee lasts.

£2,000 is the amount you should budget to have this particular boiler installed on a straightforward installation.

Get a free, no-obligation Worcester Bosch Greenstar CDi Compact 28 boiler quote today by simply entering your postcode in the box on this page. You can also speak to a boiler installation expert about heating for your home by getting in touch via email or by phone on 01604 343053.


Installed price guideline
£2,000

Get your free quote

Worcester Bosch Greenstar CDi Compact 28 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90.5%
Band ratingA
LPG Compatible?Yes
P/L Warranty7 Years
Output in kW28 kW
Height680 mm
Width390 mm
Depth280 mm
MountingWall
Flow rate11 L/m
ERP HeatA
ERP WaterA

Worcester Bosch Greenstar CDi Compact 28 Combi Gas boiler frequently asked questions

What type of boiler is Worcester Bosch’s Greenstar CDi Compact 28 - system, regular or combi?

Looking for a gas combi boiler for your house or flat? If you are, the Worcester Bosch Greenstar CDi Compact 28 boiler may be worth considering.

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.

Would the Worcester Bosch Greenstar CDi Compact 28 combi be a suitable choice of 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 CDi Compact 28 combi boiler is 28 kW kilowatts. Which types of property would this be appropriate for?

An experienced PlumbProud boiler engineer would recommend that this Worcester Bosch Greenstar CDi Compact 28 Combi boiler be installed in medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

With combi boilers like the Worcester Bosch Greenstar CDi Compact 28, you need to take the flow rate into account as well as the output rate.

Combi boilers draw water from the mains and then instantly heat that water and send it to wherever in your home it's needed. Flow rates, measured in litres per minute, are subject to the mains water pressure in your area. So, for example, if the local mains water pressure is 11 litres per minute and the flow rate of your boiler is 14 litres per minute, the boiler will not be able to process more than 11 litres per minute. The flow rate of this Worcester Bosch Greenstar CDi Compact 28 Combi boiler is 11 L/m.

If you live in a home with lots of radiators or bathrooms where many people want to use hot water at the same time, a combi boiler may not be able to cope. For reference, a power shower uses about 10 litres of water per minute. If two people want showers at the same time or one person wants a shower and the other hot water from a tap in the kitchen, your boiler may not have a large enough flow rate even if the local mains water pressure is high.

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 CDi Compact 28 fit in my house?

The Worcester Bosch Greenstar CDi Compact 28 stands at 680 mm tall, 390 mm wide and 280 mm deep.

Is the Worcester Bosch Greenstar CDi Compact 28 condensing or non-condensing?

This Worcester Bosch Greenstar CDi Compact 28 is a condensing gas boiler - we always recommend that clients choose the latest condensing models to benefit from the technology, which continues to improve year after year.

Condensing boilers capture the heat still present in flue exhaust gases and water vapour condensation, processing them through a secondary heat exchanger to, among other tasks, heat colder water returning from your radiators.

By selecting a modern condensing boiler, you'll save money on your gas bills as well as benefitting the wider environment.

Is the Worcester Bosch Greenstar CDi Compact 28 combi a good choice for the environment?

Environmentally-friendly heating has become an important issue for homeowners concerned about the accelerating pace of climate change.

Approximately 14% of the UK's greenhouse gas production is caused by our central heating systems. The gas boilers in larger urban areas of Britain are mainly responsible for emissions of toxic nitrogen dioxide.

Will you be helping the environment if you decide to install a Worcester Bosch Greenstar CDi Compact 28 combi in your home? Let’s look at the figures.

The energy efficiency rating for a boiler describes the amount of energy it uses and wastes during operation and there are two different ways to measure it.

All boilers manufactured and supplied in the UK must have a SEDBUK rating of “A” subject to a minimum energy efficiency score of 92% or above. Before April 2018, the minimum energy efficiency score was 88% (88/89% = "B" SEDBUK rating, 90%+ = "A" SEDBUK rating).

The Worcester Bosch Greenstar CDi Compact 28 scored an efficiency rating of 90.5% and a SEDBUK band rating of A.

The ERP (Energy Related Products Directive) is European legislation that aims to reduce the use of energy at all points during a product's life, from the point of manufacture to when it's in active use right through to final disposal.

The regulation aims is to encourage manufacturers to create products that are more environmentally friendly and which reduce the harmful gas emissions associated with those products.

The ERP gradings for the Worcester Bosch Greenstar CDi Compact 28 are "A" for heat and "A" for hot water.

If the Worcester Bosch Greenstar CDi Compact 28 breaks down, will I be covered by the warranty?

The Worcester Bosch Greenstar CDi Compact 28 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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