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Ariston CLAS SYSTEM ONE 18 boiler

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Plumbproud rating

81.21%

Ariston CLAS SYSTEM ONE 18 System Gas boiler

Our PlumbProud boiler quality benchmark tests score this Ariston CLAS SYSTEM ONE 18 System boiler at 81.21%. Several factors go into determining our rating including installation costs, manufacturer guarantees, energy efficiency, running costs, and more.

Provided the proposed installation is straightforward, we would anticipate that this Ariston CLAS SYSTEM ONE 18 System boiler will cost £1,900 fully installed through PlumbProud.

Get a free quote on the Ariston CLAS SYSTEM ONE 18 boiler and advice on whether this is the right choice for your home by entering your postcode in the quote box on this page, clicking here to email us, or giving us a call at 01604 343053.


Installed price around

£1,900

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Ariston CLAS SYSTEM ONE 18 System Gas boiler frequently asked questions

Is the Ariston CLAS SYSTEM ONE 18 a combi, system or regular boiler?

The Ariston CLAS SYSTEM ONE 18 boiler could be suitable for your house or flat if you are looking for a new system boiler.

System boilers need a hot water cylinder to work but, unlike heat only boilers, they don't require a cold water tank. This can be advantageous if you live in an apartment, lack attic space, or are planning a loft conversion.

System boilers allow you to set the times when you want hot water to be available. Heated water is stored in the cylinder and can be used throughout the day. With a system boiler, if you forget to set the timer, you will have to wait a while for hot water.

The constant supply of hot water from the cylinder ensures that you can have multiple taps and showers in use without a loss of pressure to each point (something combi boilers struggle with). This makes a system boiler suitable for large families and homes with more than one bathroom.

Is the Ariston CLAS SYSTEM ONE 18 system boiler suitable for my house or apartment?

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

Your boiler’s output is a measurement of the power it has available to heat the volume of water required for your taps and radiators. The higher the output rate, the more water it can heat.

You need to be careful to select a boiler with the optimal level of output for your property though. That's because, if your boiler output is too low, your water and radiators will often not be as hot as you want them to be. If the output is too high, you’ll be paying more for gas than you need to.

The output of the Ariston CLAS SYSTEM ONE 18 system is 18 kW, so which types of property would this Ariston CLAS SYSTEM ONE 18 System boiler be appropriate for?

Most experienced heating engineers would likely recommend that, at this level of output, this Ariston CLAS SYSTEM ONE 18 System boiler would be a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.


What size is the Ariston CLAS SYSTEM ONE 18 boiler?

The Ariston CLAS SYSTEM ONE 18 measures TBC mm tall, TBC mm wide, and TBC mm deep.

Is this Ariston boiler non-condensing or condensing?

The Ariston CLAS SYSTEM ONE 18 boiler is a condensing gas boiler and we recommend that you select one of the latest models if possible.

Condensing boilers reduce homeowners' gas bills and are better for the environment. They do this by capturing and recycling the heat still present in the flue exhaust gases and water vapour condensation produced when boilers burn gas to generate the power they need to operate.

Is the system Ariston CLAS SYSTEM ONE 18 boiler energy efficient?

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.

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.

Would the environmental impact of installing a Ariston CLAS SYSTEM ONE 18 system in your home be positive? Let's look at the numbers.

All boilers manufactured in the UK from April 2018 must achieve a SEDBUK “A” grade and an energy efficiency rating of 92% or above. Before that, the minimum was 88% - efficiency ratings of 88% and 89% were scored a “B” and 90%+ an "A".

A boiler's energy efficiency rating describes how much energy it uses and wastes during its standard operation.

The energy efficiency of the Ariston CLAS SYSTEM ONE 18 was rated at 90% with a SEDBUK grading of "A".

Does the Ariston CLAS SYSTEM ONE 18 system boiler come with a warranty?

The Ariston CLAS SYSTEM ONE 18 boiler is provided with a parts and labour warranty lasting 8 years.


Ariston CLAS SYSTEM ONE 18 Gas System boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?Yes
P/L Warranty8 Years
Output in kW18 kW
MountingWall

The top 10 rated Gas System boilers

Using the Plumbproud scoring system, the current 10 ten Gas System boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 61295.72%
2Vaillant ecoTEC Plus 61595.20%
3Vaillant ecoTEC Plus 61894.37%
4Vaillant ecoTEC Plus 62493.33%
5Worcester Bosch Greenstar i System 9i92.89%
6Vaillant ecoTEC Plus 63092.75%
7Worcester Bosch Greenstar 4000 12kW92.50%
8Vaillant ecoTEC Exclusive IQ 62792.42%
9Vaillant ecoFIT Pure 61292.38%
10Vaillant ecoFIT Pure 61592.36%

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The ideal boiler perfect for the largest homes

System boilers

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Ariston CLAS SYSTEM ONE 18 boiler

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Ariston CLAS SYSTEM ONE 18 System Gas boiler

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Plumbproud rating for this boiler
81.21%

Based on a wide-ranging set of important factors including the cost to install the boiler, its energy efficiency rating, running costs, and so on, this Ariston CLAS SYSTEM ONE 18 System boiler receives a score of 81.21% on our PlumbProud quality scoring system.

On straightforward installations, we would expect to charge you £1,900 for this Ariston CLAS SYSTEM ONE 18 System boiler fully installed.

For professional advice on whether the Ariston CLAS SYSTEM ONE 18 is the right boiler for your home or to receive a free quotation, please call 01604 343053 to speak to our friendly team. You are also welcome to email us by clicking here or you can enter your postcode into the quotation box on this page.


Installed price guideline
£1,900

Get your free quote

Ariston CLAS SYSTEM ONE 18 Gas System boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?Yes
P/L Warranty8 Years
Output in kW18 kW
MountingWall

Ariston CLAS SYSTEM ONE 18 System Gas boiler frequently asked questions

What type of boiler is the Ariston CLAS SYSTEM ONE 18?

The Ariston CLAS SYSTEM ONE 18 may be worth considering if you are looking for a system boiler for your house or flat.

System boilers need a hot water cylinder to work but, unlike heat only boilers, they don't require a cold water tank. This can be advantageous if you live in an apartment, lack attic space, or are planning a loft conversion.

System boilers allow you to set the times when you want hot water to be available. Heated water is stored in the cylinder and can be used throughout the day. With a system boiler, if you forget to set the timer, you will have to wait a while for hot water.

The constant supply of hot water from the cylinder ensures that you can have multiple taps and showers in use without a loss of pressure to each point (something combi boilers struggle with). This makes a system boiler suitable for large families and homes with more than one bathroom.

Should I install a Ariston CLAS SYSTEM ONE 18 system boiler in my home?

Whether this Ariston CLAS SYSTEM ONE 18 System 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 Ariston CLAS SYSTEM ONE 18 system outputs at a maximum of 18 kW, so which types of property would this Ariston CLAS SYSTEM ONE 18 System boiler be appropriate for?

To most experienced Gas Safe engineers, the Ariston CLAS SYSTEM ONE 18 system CLAS SYSTEM ONE would be most suitable for smaller homes and apartments with up to 10 radiators and one bathroom.


What dimensions does a Ariston CLAS SYSTEM ONE 18 have?

The size of the Ariston CLAS SYSTEM ONE 18 boiler is TBC mm tall, TBC mm wide, and TBC mm deep.

Is the Ariston CLAS SYSTEM ONE 18 non-condensing or condensing?

The Ariston CLAS SYSTEM ONE 18 is a condensing gas boiler - we strongly suggest that you choose either this model or a recently released model if at all possible.

A condensing boiler captures and recycles the warmth present in flue exhaust gases and water vapour condensation created by the burning of gas to warm up the water coming back into your boiler - for example, from your radiators.

Condensing boilers cost less to run (lower gas bills) and are better for the environment.

Is the Ariston CLAS SYSTEM ONE 18 system considered environmentally friendly?

How we heat our homes has become a major issue for many people worried about climate change and environmental issues in general.

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 Ariston CLAS SYSTEM ONE 18 system 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 Ariston CLAS SYSTEM ONE 18 was awarded an efficiency rating of 90% with a SEDBUK band rating of "A".

If the Ariston CLAS SYSTEM ONE 18 breaks down, will I be covered by the warranty?

The manufacturer offers a parts and labour warranty of 8 years on the Ariston CLAS SYSTEM ONE 18 boiler to new customers.


The top 10 rated Gas System boilers

Using the Plumbproud scoring system, the current 10 ten Gas System boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 61295.72%
2Vaillant ecoTEC Plus 61595.20%
3Vaillant ecoTEC Plus 61894.37%
4Vaillant ecoTEC Plus 62493.33%
5Worcester Bosch Greenstar i System 9i92.89%
6Vaillant ecoTEC Plus 63092.75%
7Worcester Bosch Greenstar 4000 12kW92.50%
8Vaillant ecoTEC Exclusive IQ 62792.42%
9Vaillant ecoFIT Pure 61292.38%
10Vaillant ecoFIT Pure 61592.36%
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