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Ariston Clas ONE Boiler – Review

Viessmann Vitodens 050-W Gas/LPG Boiler | Boilerhut
Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: March 29, 2021. Updated: February 8, 2024

Boiler only price: from £994.49

(Boiler-only price: comparing up to five suppliers, including Screwfix and Plumbase, where possible. Correct January 2024).

The Ariston Clas ONE gas and LPG boiler is a mid-range model in the Ariston range.

The Clas ONE is available as a combi, system, or regular (heat-only) boiler. Each has multiple power outputs. This all means this boiler probably has an option that’s right for you.

About

The Ariston Clas ONE boiler is a quiet and compact boiler available across multiple options. It comes in a combi, system and regular boiler setup across different power outputs. You can see all the options below.

It’s a great boiler for those who have limited space as all the options are small and powerful.

The Clas ONE comes with an 8-year warranty and stainless steel heat exchanger. It’s also compatible with Ariston Net; Ariston’s smart technology.

Key Features

  • Compact boiler and has a lightweight design, making it easy to install and service
  • Simple to use manual control panel with a backlit display
  • Holds an ‘A’ energy efficiency rating, with 94% efficiency
  • Modulation of 1:7
  • Compatible with Ariston Net (via either Cube S Net or Sensys Net)
  • Can integrate with smart thermostats, including the Ariston Net system
  • Functions include two temperature zone capability and anti-frost control
  • Comes with a standard 8-year warranty
  • Quiet operating volume starting at 49 to 52dB (depending on power output)

Technical Specification

Manufacturer Ariston
Model Clas ONE
Condensing Yes
Efficiency Rating 93-94%
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty 8 year warranty
Combi Outputs 24kw, 30kW & 38kW
Combi Hot Water Flow Rates 10.4, 12.5 & 15.5 litres/minute
System Outputs 18kW, 24kW & 30kW
Regular outputs 15kW & 24kW
Modulation Range 1:7
Noise 49 – 52dB
Mounting Wall Mounted
Weight 23 to 33kg
Dimensions 745mm (Height) x 400 (Width) x 385mm (Depth)
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Our thoughts

The Ariston Clas ONE gas and LPG boiler is smart-compatible and utilises the latest technology across its design. It’s compatible with the Ariston Net app and LPG compatible with a conversion kit

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

A trusted brand

Ariston is an international company. They haven’t always been synonymous with high-quality and reliable boilers like some other brands out there. But, Ariston have made huge improvements to the reliability of the boilers they manufacture. They 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 94%. For the best energy efficiency, there are a range of wired and wireless controls. This includes the capability to connect with a smart thermostat.

By controlling the boiler from your smartphone, computer or tablet you can ensure your heating is managed. You can also take advantage of other features, such as troubleshooting diagnostics.

Innovative technology

The Ariston Clas ONE features an Xtratech stainless steel heat exchanger. This features wide waterways in a single-coil design to maximise performance and reduce the risk of blockages. This allows the boiler to be able to provide efficient central heating across the range and good hot water flow rates for the combi boiler.

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. 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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