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Ariston CLAS ONE 24 boiler

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Plumbproud rating

81.82%

Ariston CLAS ONE 24 Combi Gas boiler

Our PlumbProud boiler quality benchmark tests score this Ariston CLAS ONE 24 Combi boiler at 81.82%. Several factors go into determining our rating including installation costs, manufacturer guarantees, energy efficiency, running costs, and more.

We would expect this Ariston CLAS ONE 24 Combi boiler to cost £1,800 fully installed through PlumbProud, although it will cost more if the fit is complicated. We will provide you with a full quote before starting work, however.

For professional advice on whether the Ariston CLAS ONE 24 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 around

£1,800

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Ariston CLAS ONE 24 Combi Gas boiler frequently asked questions

Ariston CLAS ONE 24 - a system boiler, regular boiler or combi boiler?

You might want to consider the Ariston CLAS ONE 24 for your house or flat if you are looking for a combi boiler.

The UK has some of the smallest homes in the Western world, which is partly why combi boilers were introduced in the 1970s. Traditional boilers require one or more large storage tanks which they use to either heat water and keep it warm or store water intended for heating later. These tanks took up a lot of space in people's homes.

Combi boilers save space because they don't require these tanks to operate. Instead, combis draw water direct from your mains supply then instantly heat and distribute it on demand.

The biggest disadvantage in using combi boilers is that they have a maximum capacity volume for heating water. While this may not be an issue in a small household, it could be for a larger household where there is higher demand for hot water. When more than one person is using the water, it is distributed between the two points, reducing the pressure and temperature at each point.

Is a Ariston CLAS ONE 24 combi boiler suitable for my apartment or house?

You should make sure that the boiler you install in your property is the right "size". And, by size, we don't mean how big it is, we mean how powerful it is - the "output".

Your boiler has to be powerful enough to heat all the hot water you need for your radiators and taps. Power is measured in kilowatts and the more kilowatts a boiler has available to it, the more water it can heat.

If the output (measured in kilowatts) is too high, you'll have all the power you need and more but your gas bills will be much higher. If it's too low, you'll often find that the water coming out of your taps and fed into your radiators is only lukewarm.

With the Ariston CLAS ONE 24 combi's output at 22 kW, which types of property would this Ariston CLAS ONE 24 Combi boiler be most appropriate for?

Most experienced heating engineers would likely recommend that, at this level of output, this Ariston CLAS ONE 24 Combi boiler would be a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.

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 Ariston CLAS ONE 24 Combi boiler's flow rate is 12 L/m.

As with all combi boilers, the Ariston CLAS ONE 24 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.


What size is a Ariston CLAS ONE 24 boiler?

The Ariston CLAS ONE 24 is TBC mm tall, TBC mm wide, and TBC mm deep in size.

Is the Ariston CLAS ONE 24 a non-condensing or condensing boiler?

The Ariston CLAS ONE 24 is a condensing gas boiler - in fact, we recommend that you select this model or one of the latest condensing boilers on the market as the technology continues to improve over time.

Condensing boilers capture the heat still present in the flue exhaust gases and water vapour condensation created when the gas is burned and they recycle this back into the heating system to warm up the cold water re-entering the boiler from your radiators.

They're much more environmentally friendly and installing one results in much lower annual gas bills.

Is choosing the Ariston CLAS ONE 24 combi boiler environmentally friendly?

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

Central heating produces 14% of all greenhouse gas emissions in the UK. Gas boilers in the larger cities emit dangerous levels of nitrogen dioxide.

Will choosing to install a Ariston CLAS ONE 24 combi in your home help the environment? Let's review the figures.

An energy efficiency rating of 92% or above is a legal requirement for all boilers manufactured and installed in the UK today. 92% is equivalent to a low-to-middle "A" grade on the "Seasonal Efficiency of Domestic Boilers" (SEDBUK) scale.

Energy efficiency measures how much energy a boiler uses and wastes in the course of its normal operation. The lower the waste, the lower your gas bills.

The Ariston CLAS ONE 24 was awarded an efficiency rating of "90%", equivalent to a "A" rating on the SEDBUK system.

The ERP (or Energy Related Products Directive) is a European regulation governing products which require energy to operate throughout their lives and encourages manufacturers to create products that are more environmentally friendly.

The legislation is designed to reduce the potential for harmful gas emissions during manufacturing and actual use right through to the point of final disposal.

For the Ariston CLAS ONE 24, the ERP rating is "A" for heat and "A" for hot water production.

How long is the warranty period on the Ariston CLAS ONE 24 combi boiler?

The Ariston CLAS ONE 24 boiler offers a parts and labour warranty of 8 years.


Ariston CLAS ONE 24 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?Yes
P/L Warranty8 Years
Output in kW22 kW
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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Ariston CLAS ONE 24 boiler

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Ariston CLAS ONE 24 Combi Gas boiler

  1. Home
  2. Ariston CLAS ONE 24
Plumbproud rating for this boiler
81.82%

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 Ariston CLAS ONE 24 Combi boiler, we have awarded a rating of 81.82%.

We would anticipate that this Ariston CLAS ONE 24 Combi boiler would cost you £1,800 fully installed through PlumbProud provided that the fitting is standard and with no complications.

For a free, no-obligation quotation on this Ariston CLAS ONE 24 Combi boiler or for our professional advice on whether the Ariston CLAS ONE 24 is suitable for your property, please call 01604 343053, click here to email our team or enter your postcode into the quotation box on this page.


Installed price guideline
£1,800

Get your free quote

Ariston CLAS ONE 24 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?Yes
P/L Warranty8 Years
Output in kW22 kW
MountingWall
Flow rate12 L/m
ERP HeatA
ERP WaterA

Ariston CLAS ONE 24 Combi Gas boiler frequently asked questions

Is the Ariston CLAS ONE 24 boiler a combi, regular or a system boiler?

Looking for a gas combi boiler for your flat or house? Then the Ariston CLAS ONE 24 may be an option you should consider.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is a Ariston CLAS ONE 24 combi boiler suitable for my house or flat?

It's best to choose a boiler whose size or "output" is right for your home.

The more hot water and heat you want, the higher the output level of your boiler should be. Output is measured in kilowatts and it describes the maximum level of power your boiler has to heat water.

If your output level is too low, your boiler will not have the power it needs to get your water as hot as you want it, particularly when there's a lot of demand for it. Choose a boiler whose output level is too high and you'll have all the hot water you need but will be paying too much for it through higher gas bills.

Which types of property would this Ariston CLAS ONE 24 Combi boiler be appropriate for given its output of 22 kW?

Most Gas Safe boiler installers would recommend that this Ariston CLAS ONE 24 Combi boiler would be suitable for smaller homes and apartments with up to 10 radiators and one bathroom.

You should also consider a combi boiler's "flow rate" when making your choice.

The flow rate indicates how much water it can take from the mains supply at any one time (measured in litres per minute), which it then heats and distributes to different points in your home like your bathroom, kitchen and radiators. This Ariston CLAS ONE 24 Combi boiler's flow rate is 12 L/m.

Combi boilers have no storage tanks like system or heat only boilers. This means that if the water pressure where you live is low, there's no benefit in spending money on a combi with a high flow rate because a high flow rate doesn't mean it can draw any more water from the mains.

In addition, there might be lots of people in your household who want to use hot water at the same time while also having the central heating on. Given that average mains pressure in the UK is between 10 and 12 litres per second and a power shower usually requires about 12 litres of water per minute, a combi boiler might not be the right choice for you and your family.

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 Ariston CLAS ONE 24 fit in my house?

The Ariston CLAS ONE 24 measures TBC mm high and TBC mm wide by a depth of TBC mm.

Is the Ariston CLAS ONE 24 non-condensing or condensing?

We recommend that, if possible, you choose a condensing boiler like the Ariston CLAS ONE 24.

Condensing boilers are more energy-efficient. They achieve this efficiency by capturing the heat present in flue exhaust gases and water vapour condensation and recycling that heat to, for example, warm colder water coming back from your radiators.

By choosing the latest condensing boiler, you'll also notice a significant reduction in your gas bills, particularly if you're replacing a boiler more than 15 years old.

Does the Ariston CLAS ONE 24 combi protect the environment?

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.

Central heating systems are responsible for 14% of greenhouse gas emissions in the UK. You may also be aware that the gas boilers we use emit dangerous nitrogen dioxide in large volumes in the bigger British cities.

Would choosing the Ariston CLAS ONE 24 combi be an environmentally-friendly choice? If so, let's look at its performance figures.

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 Ariston CLAS ONE 24 was given an efficiency rating of 90% 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.

The Energy Related Products (ERP) Directive is important European legislation that aims to limit energy use and harmful gas emissions during the manufacturing process, when the product is in use, and after it is disposed of.

For the Ariston CLAS ONE 24, the ERP Heat rating is "A" and the ERP Water rating is "A".

Am I covered if the Ariston CLAS ONE 24 combi boiler breaks down?

A parts and labour warranty of 8 years is included when you purchase the Ariston CLAS ONE 24 boiler through PlumbProud.


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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