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Last Updated on November 21, 2023

Ariston Clas ONE Gas Combi Boiler Review

The Ariston Clas ONE Gas Combi Boiler is a top-of-the-range model in the Ariston collection, with three power outputs available. Our team have reviewed this model and this review article covers everything you need to know before deciding whether it is right for you and your family.

Technical Specification:

Manufacturer Ariston
Model Clas ONE
Condensing Yes
Efficiency Rating 90%
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty 8 year warranty
Central Heating Max. Output 22, 28 or 31 kW
Mounting Wall Mounted
Weight 29.7, 32.3 or 34.6 kg
Dimensions 745mm (Height) x 400 (Width) x 385mm (Depth)

The Ariston Clas ONE Gas Combi Boiler is available in the following sizes: 24, 30 and 38 kW

kW Size Flow Rate
24kW 10.4 l/min
30kW 12.5 l/min
38kW 15.5 l/min

Key Features:

  • This is a fairly compact boiler and has a lightweight design, making it easy to install and monitor
  • Simple to use manual control panel with a backlit display
  • Holds an ‘A’ energy efficiency rating, with 90% efficiency, even higher when combined with smart technology controls
  • Compatible with Ariston Net via either Cube S Net or Sensys Net
  • Provides a heating output of up to 31 kW and modulation of 1:7

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The Ariston Clas ONE Gas Combi Boiler is a quiet and compact heating and water system. This makes it ideal for those with limited space, but who are looking to install an effective boiler that can heat your home after a painless and affordable installation.

  • Can be installed in a standard cupboard in a kitchen, bathroom or airing cupboard, doesn’t require a tank or water cylinder
  • Can integrate with smart thermostats, including the Ariston Net system
  • Functions include two temperature zone capability and anti-frost control
  • Compatible with solar panels
  • Comes with a standard 8-year warranty
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Our thoughts:

The Ariston Clas ONE Gas Combi Boiler is smart-compatible and utilises the latest technology across its design. Features include compatibility with the Ariston Net smart technology app and LPG conversion kit with purchase.

Although not as compact as other models on the market, it could still be installed to fit inside an airing cupboard.

A trusted brand

Ariston is an international company, but they haven’t always been synonymous with high quality and reliable boilers like some other brands out there.

However, Ariston has made significant efforts to improve the reliability of the boilers they manufacture and also now offer an extended warranty.

Energy-efficient so you reduce your bills

The Ariston Clas ONE has an ErP ‘A’ rating and an energy efficiency running performance of 90%. For optimum energy efficiency, there are a range of wired and wireless controls, including the capability to connect with a smart energy management system such as Ariston’s Ariston Net programme, energy efficiency can be increased. 

By controlling the boiler from your smartphone, computer or tablet you can ensure your heating is managed sensibly and take advantage of additional features, such as troubleshooting diagnostics if your boiler is malfunctioning.

Innovative technology

Alongside energy efficiency, this boiler has other innovations included. The Ariston Clas ONE features an Xtratech stainless steel heat exchanger, which features wider waterways in a single-coil design to maximise performance and reduce the risk of blockages.

This allows the boiler to be able to provide high central heating and water flow rates, without the need for a water tank or cylinder.

Easy Installation

Being wall-mounted and a relatively compact combi boiler, this is an easy boiler to have installed. It comes with an LPG conversion kit if you are looking for an LPG powered system.

Wide availability of parts 

Although not manufactured in the UK, parts for the Ariston are widely available. Because this boiler is widely sold, parts are extensively available. If you need a replacement item you can find spare parts at Screwfix, Plumbase and other plumbing merchants both in-store and online.

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