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Ariston CLAS ONE 24 boiler

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Plumbproud rating

81.82%

Ariston CLAS ONE 24 Combi Gas boiler

Assessing factors including the system's running costs, its energy efficiency, the manufacturer’s guarantee, and its likely installed price, we scored this Ariston CLAS ONE 24 Combi boiler 81.82% on our internal PlumbProud grading system.

This Ariston CLAS ONE 24 Combi boiler will cost approximately £1,800 supplied and fully installed through PlumbProud assuming that there are no unexpected complications during the fitting.

Enter your postcode in the box provided and receive a free quote for the Ariston CLAS ONE 24 boiler for your home. We are also happy to answer any questions you might have about any of our boilers. You can do this by emailing the team or calling us today on 01604 343053.


Installed price around

£1,800

GET A COMPETITIVE BOILER QUOTE

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

Ariston CLAS ONE 24 Combi Gas boiler frequently asked questions

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

The Ariston CLAS ONE 24 boiler could be suitable for your house or flat if you are looking for a new combi boiler.

Traditionally, boilers needed one or more large tanks installed in your property to store their heated water or water that was to be heated later. These tanks were often too large to be practical for most homes so the combi boiler was introduced to Britain in the 1970s by manufacturers to help homeowners overcome this issue.

Instead of using tanks as storage, a combi boiler heats water on demand. It draws water from the mains and heats it instantly on demand before distributing it to wherever it is needed in a property, be it your taps or radiators.

Unfortunately, combi boilers have one main disadvantage for larger properties or larger households. Because they have a maximum volume of water that can be heated on demand at any given time, water pressure, volume and temperature will drop if, for example, someone is taking a shower and another person in your home wants to use a hot water tap at the same time.

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

Whether this Ariston CLAS ONE 24 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.

A boiler’s output is a measurement of the amount of power it can use to provide hot water to your taps and radiators. The higher its output rate, the more water it can heat.

If your new boiler’s output is too low, your hot water might not be as hot as you want it to be. If it's too high, you’ll be paying more for gas than you need to.

The output of the Ariston CLAS ONE 24 combi boiler is 22 kW, so which types of property would this be 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.

Please remember too that all combi boilers draw water from the mains - they have no storage tanks. Combis heat the water from the mains on demand and then send it to wherever it's needed in the house, like a radiator, a bathroom or a kitchen.

The speed at which it can do this is called the "flow rate", which is measured in litres per minute. If you have a lot of radiators and bathrooms in your home and multiple people are regularly trying to use the hot water at one time, such as in the morning or evening, you'll need a combi with a high flow rate. This Ariston CLAS ONE 24 Combi boiler's flow rate is 12 L/m.

However, it's not that simple. Combis can only draw water from the mains at the speed it's delivered. If the flow rate of the local water supply is 11l/m, you shouldn't purchase a boiler with a flow rate of 17l/m because it will never be able to use that extra capacity.

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 dimensions does a Ariston CLAS ONE 24 have?

The Ariston CLAS ONE 24 boiler measures TBC mm [H] x TBC mm [W] x TBC mm [D] in size.

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

We recommend that you select a condensing boiler like the Ariston CLAS ONE gas Ariston CLAS ONE 24 for your home if possible because of the environmental benefits and the money you'll save on your gas bills.

Condensing boilers are much more energy-efficient than older, non-condensing models as they capture and recycle the heat still present in the water vapour condensation and flue exhaust gases that your boiler creates when burning gas for reuse.

Is the Ariston CLAS ONE 24 combi boiler an environmentally friendly choice?

Many homeowners are now worried about climate change and the damage they do to the environment from heating their homes has become a subject of increasing concern.

With central heating being responsible for 14% of greenhouse gas emissions in the UK, your choice of boiler matters. Gas boilers are also responsible for the significant atmospheric volumes of dangerous nitrogen dioxide emissions in larger British cities.

Will installing a Ariston CLAS ONE 24 combi be a positive contribution to the environment? Let's see what the experts say.

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 Ariston CLAS ONE 24 scored an efficiency rating of 90% and a SEDBUK band rating of A.

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 Ariston CLAS ONE 24 is "A" for heat and "A" for hot water.

What warranty does the Ariston CLAS ONE 24 combi boiler come with?

The Ariston CLAS ONE 24 is covered by a parts and labour warranty of 8 years following installation.


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%

Assessing factors including the system's running costs, its energy efficiency, the manufacturer’s guarantee, and its likely installed price, we scored this Ariston CLAS ONE 24 Combi boiler 81.82% on our internal PlumbProud grading system.

We would expect that, unless there are complications during fitting, this Ariston CLAS ONE 24 Combi boiler would cost £1,800 supplied and professionally installed through PlumbProud.

To get a free quote for the installation of the Ariston CLAS ONE 24 boiler in your home, simply enter your postcode in the box provided on this page. You can also find out whether this is the right boiler for your home by clicking to email our installation team or by calling us on 01604 343053.


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

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

Suitable for a house or a flat, the Ariston CLAS ONE 24 combi boiler is worth considering if you want 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.

Would the Ariston CLAS ONE 24 combi boiler be suitable for my house or flat?

It's best to choose a boiler whose size or "output" is right for your property. With boilers, however, size does not mean how big a boiler is, it means how much power it has.

The output of a boiler is measured in kilowatts and tells you how much power it has available to heat the water it sends to your hot taps, showers and radiators. The greater the demand for hot water in your home, the larger the output you will need.

It is important to select a boiler with the optimal output rate. Choose one with too high an output and your gas bills will be too expensive. Choose one with too low an output and sometimes the water in your radiators and coming out of your taps will be barely lukewarm.

The output of the Ariston CLAS ONE 24 combi is 22 kW kilowatts, so which types of property would this be most suitable for?

Most experienced boiler engineers would recommend this Ariston CLAS ONE 24 Combi boiler as a suitable option for smaller homes and apartments with no more than up to 10 radiators and one bathroom.

Flow rates are important when choosing a combi boiler as well as output rates.

A combi boiler's flow rate (measured in litres per minute) describes how much water it can instantly heat then distribute to the taps and radiators in your home - you will need to factor this into your decision on a new combi boiler. This Ariston CLAS ONE 24 Combi boiler's flow rate is 12 L/m.

If you have a lot of radiators and bathrooms in your home and there's lots of demand within your household for hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate.

However, it's not quite that simple. If your local mains water pressure is low, you're not going to gain any benefit from choosing a combi boiler with a high flow rate because that higher flow rate 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.


Ariston CLAS ONE 24 size

The Ariston CLAS ONE 24 boiler measures TBC mm [H] x TBC mm [W] x TBC mm [D] in size.

Ariston CLAS ONE 24 – condensing or non-condensing?

Condensing boilers like the Ariston CLAS ONE 24 improve energy efficiency and reduce your annual expenditure on gas.

They do this by capturing and recycling the warmth still present in water vapour condensation and flue exhaust gases to, for example, increase the temperature of the colder water returning from your radiators.

Condensing boilers are also much better for the environment because they emit fewer greenhouse gases.

Is the Ariston CLAS ONE 24 combi an energy-efficient boiler?

As more of us become concerned by the effects of climate change, the damage we do to the environment by heating our homes has emerged as an important issue for many homeowners.

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.

Is the Ariston CLAS ONE 24 combi boiler an environmentally friendly choice for your home? Here’s what the figures say.

By law, the minimum level of energy efficiency for boilers manufactured in the UK is 92%, equivalent to a good SEDBUK “A” rating. Prior to April 2018, the minimum was 88% - boilers whose energy efficiency levels were 88% or 89% were given a "B" rating on the SEDBUK scale and those at 90% or higher were given an "A".

The energy efficiency rating awarded to each boiler indicates the amount of energy that is wasted when in operation.

Following testing, the Ariston CLAS ONE 24 was given a 90% energy efficiency rating and a SEDBUK grading of "A".

In 2015, the Energy Related Products Directive (ERP) came into force. The legislation applies to all products that consume energy in production, during their active life, and at the point of final disposal.

The ERP was introduced to incentivise manufacturers to create products that emitted fewer harmful gases with the larger aim of protecting the wider environment.

The Ariston CLAS ONE 24 has been awarded an ERP rating of "A" for heat and "A" for water.

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

The parts and labour warranty on the Ariston CLAS ONE 24 lasts for 8 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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