Equipped with a host of advanced features, the Ariston Clas System One is a wall hung condensing system boiler that must be installed together with a hot water storage cylinder.

It is set up to run on natural gas, however, an LPG (liquefied petroleum gas) conversion kit is included in the box to allow the boiler to be fitted in off-gas grid homes. This model is available in three different outputs of 18kW, 24kW and 30kW, meaning there is an option for most small, medium and large-sized properties.

The Clas System One will set you back anything from £774.78 to £1,122.95 and is supported by a lengthy 8-year warranty as standard.

Boiler Energy Efficiency Credentials

Ariston’s Clas System One comes with an Xtratech stainless steel heat exchanger to improve energy efficiency and ensure the boiler can perform better than ever before. It also features a built-in ‘auto’ function that monitors the temperature and chooses the ideal heating output whilst consuming less gas and electricity, which helps to enhance boiler efficiency and performance. This appliance actually has an efficiency rating of 90%, making it an A rated boiler that also happens to be endorsed by the Energy Saving Trust. To achieve further energy and cost savings, you can use the boiler with a selection of optional controls including wired and wireless accessories.

Clas System One Technology and Main Advantages

The Clas System One boiler combines Italian design with Ariston branded components to provide confidence in quality. It is developed with an improved silencer and the latest soundproofing technology to ensure the unit remains quiet at all times, with boiler noise levels being similar to a fridge freezer.

With frontal access to all components and more room inside the unit for engineers to work, the boiler allows for hassle-free installation, servicing and repair. It has the same connections in the same places as previous models to enable your installer to easily replace an older Ariston boiler. Plus, this appliance has a colour coded wiring, low voltage connections and a well-designed circuit board to make boiler set up straightforward.

This boiler now has 142% wider waterways to allow water to pass through quicker and reduce the risk of blockages, as well as an Xtratech heat exchanger with an improved condensing surface and hydraulic performance to enable the boiler to deliver a better transfer of heat.

In addition to these features, the Clas System One includes an ‘auto’ function to optimise efficiency and a ‘comfort’ mode that makes sure you never run out of hot water. These modes can be activated via the user-friendly display panel with intuitive buttons.

Is the Ariston Clas System One the Right Boiler Type and Size for Your Home?

Since the Ariston Clas System One does not need any tanks in the loft, it is designed to suit most property types and sizes with little or no loft space. It’s also a great choice for homes with more than 1 bathroom and greater hot water requirements because it can provide plenty of hot water to multiple taps at the same time. But remember, you will need a separate cylinder for storing your hot water. Also, you must consult a Gas Safe engineer for help with picking the right boiler output for your needs.