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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 awarded this Worcester Bosch Greenstar CDi Compact 28 Combi boiler a rating of 92.57% 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.

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

For a free quote on the Worcester Bosch Greenstar CDi Compact 28 boiler and to get professional advice and guidance on whether it is the right choice for your home, please enter your postcode in the quote boxes on this page, click here to email us, or call us on 01604 343053.


Installed price around

£2,000

GET A COMPETITIVE BOILER QUOTE

Please enter your postcode below to get a personalised quotation for the perfect boiler for your home

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?

The Worcester Bosch Greenstar CDi Compact 28 is an option you may wish to consider if you’re looking for a combi boiler for your house or flat.

Traditional boilers require at least one large cylindrical tank to work, normally housed in a large landing cupboard, utility room or the attic. As the UK has some of the world's smallest residential properties, manufacturers introduced the combi boiler in the 1970s to address the issue of space while meeting homeowners' need for central heating and hot water at the same time.

Combi boilers don't need external storage tanks. Instead, they draw water directly from the mains, heat it and then distribute it on demand to the areas where it is needed.

The most important disadvantage of combi boilers is that they have a maximum capacity for the amount of water they can heat up. This means that, if one person in your household is having a shower and another person turns on a hot water tap elsewhere, then the volume, pressure and temperature of the water to both points decreases.

Is the Worcester Bosch Greenstar CDi Compact 28 combi boiler a suitable option for my house or flat?

Whether this Worcester Bosch Greenstar CDi Compact 28 Combi boiler is right for your property depends on its size or what its "output" level is. Size does not mean its physical dimensions, however - it means how powerful it is.

The output rating indicates how much energy a boiler can use in providing you with hot water and heat when you need it from your radiators and taps. The greater the output, the more water it can heat.

It's better to take advice on this from a registered installer because, if your boiler output is too low, your water and radiators might not get as hot as you would like them to be. However, if the output level is too high, you'll end up paying more on your gas bills than you need to.

Which types of property would this Worcester Bosch Greenstar CDi Compact 28 Combi boiler be appropriate for given its output of 28 kW?

Most Gas Safe boiler installers would likely recommend that, at this level of output, this Worcester Bosch Greenstar CDi Compact 28 Combi boiler would be a suitable choice for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

You'll also need to be sure to choose a combi boiler with the right flow rate for your home.

The flow rate indicates the maximum volume of hot water (measured in litres per minute) that your boiler can distribute at any given time. This means that if you and your family are likely to be using several taps and showers simultaneously or you have a lot of radiators, you need a boiler with a high flow rate. This Worcester Bosch Greenstar CDi Compact 28 Combi boiler's flow rate is 11 L/m.

As with all combi boilers, the Worcester Bosch Greenstar CDi Compact 28 is only able to heat and distribute water at the rate at which it actually enters your property.

For this reason, you shouldn't purchase a boiler with a very high flow rate if the flow rate in your mains pipes is lower because the extra capacity doesn't mean it can draw more water from the mains pipes.

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 CDi Compact 28?

The Worcester Bosch Greenstar CDi Compact 28 measures 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 an energy-efficient boiler?

How we heat our homes and the damage this does to the environment has become a pressing concern for many homeowners worried about the effects and impact of climate change.

We generate 14% of UK greenhouse gas emissions through centrally heating our domestic properties. Gas boilers are mainly responsible for harmful nitrogen dioxide emissions in larger British cities.

Will installing a Worcester Bosch Greenstar CDi Compact 28 combi be a positive contribution to the environment? Let's see what the experts say.

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 CDi Compact 28 was given an efficiency rating of 90.5% and a SEDBUK grading of "A".

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

Its purpose is to encourage manufacturers to offer products that are kinder to the environment by reducing harmful gas emissions at all stages, from production and end use right through to disposal.

The ERP rating for the Worcester Bosch Greenstar CDi Compact 28 is "A" for heat and "A" for water.

What is the warranty period for the Worcester Bosch Greenstar CDi Compact 28?

You receive a parts and labour warranty of 7 years with the Worcester Bosch Greenstar CDi Compact 28 boiler.


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 score each boiler we sell by considering a number of different factors including price installed, manufacturer guarantees, energy efficiency, the likely cost of running, and more. For this Worcester Bosch Greenstar CDi Compact 28 Combi boiler, we have awarded a rating of 92.57%.

On most non-complicated installations, we would expect this Worcester Bosch Greenstar CDi Compact 28 Combi boiler to cost £2,000 including installation if you choose PlumbProud to do the work.

To receive a free quote on the Worcester Bosch Greenstar CDi Compact 28 boiler, as well as professional advice on whether it will meet the needs of your home, simply enter your postcode in the quote box on this page, click here to email us, or call 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

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

Suitable for a house or a flat, the Worcester Bosch Greenstar CDi Compact 28 combi boiler is worth considering if you want a combi boiler.

Traditional boilers have one or more large tanks in which they store either heated water or water to be heated later. Manufacturers originally introduced combi boilers to the market in the 1970s to enable homeowners to save space - UK residential properties are among the smallest in the Western world.

Combi boilers don't need these tanks because they draw water directly from the mains and instantly heat it on demand thanks to the technology inside the boiler. Combi boilers then distribute this hot water to your home’s taps and radiators when needed.

The most significant disadvantage of combi boilers is that they are not ideal in larger homes where multiple people might want hot water at the same time – for example, if someone is having a shower while another wants to wash dishes in the kitchen. This is because combi boilers have a maximum volume of water that they can heat. When two people want hot water at the same time, the water temperature, pressure and volume delivered to both points drop.

Should I choose a Worcester Bosch Greenstar CDi Compact 28 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 CDi Compact 28 combi boiler is 28 kW kilowatts. Which types of property would this be appropriate for?

An experienced boiler engineer would recommend that this Worcester Bosch Greenstar CDi Compact 28 Combi boiler would provide adequate heating and hot water for medium-sized homes and larger apartments with up to 10-15 radiators and two bathrooms.

In addition to output rates, you need to consider a combi boiler's flow rate when making your choice.

The flow rate of your boiler dictates the maximum volume of water (measured in litres per minute) that it can heat and distribute to your taps, showers and radiators at any one time.

However, a combi boiler like the Worcester Bosch Greenstar CDi Compact 28 can only heat and deliver water at the rate at which it actually enters your property. For this reason, you should also find out what the mains pressure to your house is before purchasing a boiler.

It's pointless spending more money on a boiler with a 17l/m flow rate if the local water pressure is 11l/m. To give you an indication of average water demand, a power shower typically requires 12 litres of water per minute and a basin tap 4-8 litres. This Worcester Bosch Greenstar CDi Compact 28 Combi boiler's flow rate is 11 L/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 big is the Worcester Bosch Greenstar CDi Compact 28?

The Worcester Bosch Greenstar CDi Compact 28 is 680 mm tall, 390 mm wide, and 280 mm deep in size.

Worcester Bosch Greenstar CDi Compact 28 – 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 CDi Compact 28.

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.

Is the Worcester Bosch Greenstar CDi Compact 28 combi boiler rated as environmentally friendly?

How we heat our homes and the effect that has on climate change has become important to many homeowners worried about the environment.

In the largest cities of Britain, gas boilers are responsible for dangerous levels of atmospheric nitrogen dioxide emissions. In total, 14% of the UK’s greenhouse gases are produced by central heating systems.

Will choosing to install a Worcester Bosch Greenstar CDi Compact 28 combi in your home help the environment? Let's review the figures.

The energy efficiency rating of the Worcester Bosch Greenstar CDi Compact 28 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).

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 CDi Compact 28 is "A" for heat and "A" for hot water.

What is the warranty period for the Worcester Bosch Greenstar CDi Compact 28?

The Worcester Bosch Greenstar CDi Compact 28 is covered by a parts and labour warranty of 7 years following installation.


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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