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Witten by Bernard Morgan (Engineer).
First Published: March 29, 2021. Updated: November 21, 2023

Ariston Alteas ONE Net Gas Combi Boiler Review

The Ariston Alteas ONE Net Gas Combi Boiler is a small, wall-mounted high-performance boiler. Our experts here at Boilerhut have taken a look at this boiler and laid out all the information you might need about this model.

Technical Specification:

Manufacturer Ariston
Model Alteas ONE Net 
Condensing Yes
Efficiency Rating 90.1%
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty 12 years
Central Heating Max. Output 30 or 35 kW
Mounting Wall mounted 
Weight 35.3 or 37.6 kgs
Dimensions 745mm (Height) x 400 (Width) x 385mm (Depth)

The Ariston Alteas ONE Net Gas Combi Boiler is available in either 30 or 35kW sizes 

kW Flow Rate
30 12.3 l/min
35 14.1 l/min

Key Features:

  • The Ariston Alteas ONE Net Gas Combi Boiler is a high-performance boiler with a good energy efficiency rating
  • This is an award-winning top-of-the-range model with a sleek and stylish design
  • Italian made, with a stunning black finish and a range of impressive safety features
  • Comes with an extended warranty period of 12 years
  • Features include Ariston’s patented Xtratech™ stainless steel heat exchanger which provides reliability and improved heating


The Ariston Alteas ONE Net Gas Combi Boiler has won awards for its modern design and sleek finish. While black might not be to everyone’s taste, it does have an ultra-safe front panel that will guarantee it will not break under pressure. Available in 30 and 35kW models, this model will be suitable for medium-sized households with up to 2 bathrooms.

  • Operates 1:10 modulation ratio
  • Features built-in WI-Fi and digital timer programming
  • Has an energy rating of over 90% and an ErP rating A
  • Compact so it can be hidden in a cupboard or take up little wall space in a kitchen or bathroom
  • Available with an extended warranty period
  • Quiet operating volume starting at 51dB

Our thoughts:

The Ariston Alteas ONE Net doesn’t require a hot water tank or a water cylinder, so if you don’t already have them and are looking for a low-cost installation this boiler could be right for you. 

There are two sizes – both suitable for medium to large households. 

Energy efficiency

This boiler has an ‘A’ ErP rating and operates at 90.1% efficiency. This will ensure that your energy bills stay low. The ignition system of this boiler, featuring electronic combustion control will make sure that performance is central to your usage.


We aren’t exaggerating when we say the Ariston Alteas ONE Net is a high-performance boiler. It has a modulation ratio of 1:10 and central heating output of up to 37.6kW. 

As well as running reliably, it is also quiet so even if it is installed in a room that you frequently use, you won’t be bothered by the noise.

Smart technology

The Ariston Alteas ONE Net boiler is compatible with Ariston Net, Ariston’s own innovative smart technology. This system is designed and manufactured by Ariston, to provide an upgraded way to make the most of the efficiency of your domestic heating system. 

Ariston Net allows you to start, stop and monitor the temperature of your heating and water temperature whenever you want and wherever you are from a smartphone, tablet or computer. It can even work as diagnostic support if your boiler is malfunctioning. The boiler is also compatible with other smart energy management systems including Nest and Tado.

Made in Italy

Looking at the stylish design of this model, you won’t be surprised to learn it is manufactured in a country synonymous with style – Italy. 

The large touchscreen display and scratch-proof tempered glass panel makes this model more than a pretty face – it is both practical and robust.

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