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Condensing Gas Boilers

CLAS ONE

The best option if you are considering changing boilers, as it fits any type of installation. With the CLAS ONE condensing boiler enjoy maximum comfort in heating and hot water in your home.

Made in Italy

Made entirely in Italy

Super Silent

Silent functioning, respectful to the quiet in your everyday life

Easy Installation

Installation time and process optimized in cooperation with experts and professionals

Compact Size

Compact design with reduced dimensions for an easy fit at your home

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advantages and benefits

• New stainless steel XtraTech™ heat exchanger exclusive to Ariston, with high head

• LCD display

• Erp Class A+ heating achievable with thermal regulation

• Modulation ratio 1:7

• Optimised internal silencer

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CLAS ONE

discover its features

NEW PER4MANCE SYSTEM
4 technologies for exclusive performance: New XTRATECH ™ EXCHANGER: Maximum quality. ABSOLUTE EFFICIENCY: Energy class A +. Always connected with Ariston Net. Full control, Total Comfort.

NEW PER4MANCE SYSTEM

NEW PER4MANCE SYSTEM
XTRATECH HEAT EXCHANGER
The new patented ExtraTech heat exchanger is the heart of ONE condensing technology for heating, designed to guarantee performance with maximum durability over time.

XTRATECH HEAT EXCHANGER

XTRATECH HEAT EXCHANGER
ABSOLUTE EFFICIENCY
The condensing technology and accessories for thermoregulation improve efficiency and performance, reaching up to energy class A +.

ABSOLUTE EFFICIENCY

ABSOLUTE EFFICIENCY
TOTAL COMFORT
A unique set of innovative smart functions for a rapid and stable heating with customization able to satisfy every need.

TOTAL COMFORT

TOTAL COMFORT
QUALITY
100% GUARANTEED BY ARISTON:
Every single component is developed in order to guarantee long-lasting performance and high efficiency, with the guarantee of the Ariston brand.

100% CONTROLLED AND TESTED:
Every single Ariston product is rigorously tested in terms of quality, efficiency and safety before being delivered, with superior results guaranteed by our commitment.

100% BUILT TO LAST:
Strong and super resistant materials, components and products developed to work in extreme conditions to provide high level results with maximum durability.

QUALITY

QUALITY
ITALIAN DESIGN
The improved design of the ONE Series is based on innovative lines, new materials and technological user interfaces for an even more comfortable experience.

ITALIAN DESIGN

ITALIAN DESIGN

CLAS ONE

discover its features

NEW PER4MANCE SYSTEM

4 technologies for exclusive performance: New XTRATECH ™ EXCHANGER: Maximum quality. ABSOLUTE EFFICIENCY: Energy class A +. Always connected with Ariston Net. Full control, Total Comfort.

XTRATECH HEAT EXCHANGER

The new patented ExtraTech heat exchanger is the heart of ONE condensing technology for heating, designed to guarantee performance with maximum durability over time.

ABSOLUTE EFFICIENCY

The condensing technology and accessories for thermoregulation improve efficiency and performance, reaching up to energy class A +.

TOTAL COMFORT

A unique set of innovative smart functions for a rapid and stable heating with customization able to satisfy every need.

QUALITY

100% GUARANTEED BY ARISTON:
Every single component is developed in order to guarantee long-lasting performance and high efficiency, with the guarantee of the Ariston brand.

100% CONTROLLED AND TESTED:
Every single Ariston product is rigorously tested in terms of quality, efficiency and safety before being delivered, with superior results guaranteed by our commitment.

100% BUILT TO LAST:
Strong and super resistant materials, components and products developed to work in extreme conditions to provide high level results with maximum durability.

ITALIAN DESIGN

The improved design of the ONE Series is based on innovative lines, new materials and technological user interfaces for an even more comfortable experience.

Technical data

24

30

35

POWER specifications

Max/min nominal calorific flow rate (Pci) Qn	22.0/3.7 kW	28.0/4.3 kW	31.0/3.5 kW
Max/min nominal calorific flow rate (Pcs) Qn	24.4/4.1 kW	31.1/4.8 kW	34.4/5.6 kW
Domestic hot water max/min nominal calorific flow rate (Pci) Qn	26.0/3.7 kW	30.0/4.3 kW	34.5/5.0 kW
Domestic hot water max/min nominal calorific flow rate (Pcs) Qn	28.9/4.1 kW	33.3/4.8 kW	38.3/5.6 kW
Max/min power output (80°C-60°C) Pn	21.4/3.4 kW	27.4/3.9 kW	30.2/4.7 kW
Max/min power output (50°C-30°C) Pn	23.6/3.9 kW	30/4.5 kW	33.5/5.3 kW
Domestic hot water max/min power output Pn	24.9/3.5 kW	28.7/4.1 kW	33.0/4.8 kW
Combustion efficiency (of flue gas)	98 %	98 %	97,9 %
Nominal calorific flow rate efficiency (60/80°C) Hi/Hs	97.5/87.8 %	97.9/88.2 %	97.5/87.8 %
Nominal calorific flow rate efficiency (30/50°C) Hi/Hs	107.3/96.7 %	107.3/96.6 %	108.2/97.4 %
Efficiency at 30% at 30°C (condensation) Hi/Hs	109.8/98.9 %	109.6/98.7 %	109.6/98.7 %
Minimum calorific flow rate efficiency (60/80°C) Hi/Hs	93.1/83.8 %	91.1/82 %	93.3/84 %
Loss of burner gas when operating	2 %	2 %	2,1 %

more information

CLAS ONE

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Technical data

24

30

35

POWER specifications

Max/min nominal calorific flow rate (Pci) Qn	22.0/3.7 kW	28.0/4.3 kW	31.0/3.5 kW
Max/min nominal calorific flow rate (Pcs) Qn	24.4/4.1 kW	31.1/4.8 kW	34.4/5.6 kW
Domestic hot water max/min nominal calorific flow rate (Pci) Qn	26.0/3.7 kW	30.0/4.3 kW	34.5/5.0 kW
Domestic hot water max/min nominal calorific flow rate (Pcs) Qn	28.9/4.1 kW	33.3/4.8 kW	38.3/5.6 kW
Max/min power output (80°C-60°C) Pn	21.4/3.4 kW	27.4/3.9 kW	30.2/4.7 kW
Max/min power output (50°C-30°C) Pn	23.6/3.9 kW	30/4.5 kW	33.5/5.3 kW
Domestic hot water max/min power output Pn	24.9/3.5 kW	28.7/4.1 kW	33.0/4.8 kW
Combustion efficiency (of flue gas)	98 %	98 %	97,9 %
Nominal calorific flow rate efficiency (60/80°C) Hi/Hs	97.5/87.8 %	97.9/88.2 %	97.5/87.8 %
Nominal calorific flow rate efficiency (30/50°C) Hi/Hs	107.3/96.7 %	107.3/96.6 %	108.2/97.4 %
Efficiency at 30% at 30°C (condensation) Hi/Hs	109.8/98.9 %	109.6/98.7 %	109.6/98.7 %
Minimum calorific flow rate efficiency (60/80°C) Hi/Hs	93.1/83.8 %	91.1/82 %	93.3/84 %
Loss of burner gas when operating	2 %	2 %	2,1 %

more information

CLAS ONE

Message

Email

Phone

I accept the privacy's information

Accept

Having read the Privacy Policy above, aware that my consent is purely optional, as well as revocable at any time, I give my consent to the processing of my data for the Company to send promotional / commercial communications and to carry out marketing activities in the manner and in accordance with the provisions of the Privacy Policy. privacy's information

Accept

Deny

Please fill out all mandatory fields

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CLAS ONE

advantages and benefits