Ariston Clas One 30 kW LPG Condensing Combi Boiler – White

Ariston Clas One 30 kW LPG combi boiler

The Ariston Clas One 30 kW LPG Condensing Combi Boiler is a wall-mounted gas boiler designed to provide central heating and domestic hot water from a compact appliance.

The Clas One range uses Ariston XtraTech™ stainless-steel heat exchanger technology, electronic controls and modulation designed to adjust boiler output according to heating demand.

The 30 model provides a maximum useful heating output of approximately 27.4 kW at 80/60°C and a maximum useful domestic-hot-water output of approximately 28.7 kW under the manufacturer’s specified conditions.

This product is intended for customers looking for an Ariston 30 kW LPG combi boiler, Ariston Clas One condensing boiler, LPG central heating boiler or wall-mounted LPG combi boiler.

Key Features

• Ariston Clas One 30
• 30 kW-class condensing combi boiler
• LPG configuration
• Central heating and domestic hot water
• Wall-mounted installation
• XtraTech™ stainless-steel heat exchanger
• Wide modulation
• LCD control display
• Compact boiler design
• Room-sealed combustion
• Low-NOx combustion technology
• Electronic ignition
• Automatic combustion control
• Designed for heating and domestic hot-water demand
• White finish
• Suitable for appropriately specified residential installations

Ariston Clas One 30 LPG Boiler

The Ariston Clas One 30 LPG boiler is designed for properties requiring both central heating and domestic hot water.

The boiler belongs to Ariston’s CLAS ONE range of condensing gas boilers. Ariston’s European documentation identifies the CLAS ONE 30 model as a wall-mounted condensing boiler with a 30 kW-class heating/DHW configuration.

For LPG applications, the exact gas configuration and applicable conversion kit should be confirmed before ordering and installation.

30 kW Condensing Combi Boiler

The Clas One 30 is commonly searched for as a 30 kW combi boiler.

However, it is important to distinguish nominal gas input from useful heat output.

For the 30 model, Ariston specifies:

• Maximum nominal heating input: 28.0 kW PCI
• Maximum useful heating output at 80/60°C: 27.4 kW
• Maximum useful heating output at 50/30°C: 30.0 kW
• Maximum DHW useful output: 28.7 kW

These figures are operating/test specifications and should not be treated as a single universal “30 kW output” figure.

Condensing Gas Boiler Technology

The Ariston Clas One uses condensing technology to recover heat from the combustion process.

When operated under suitable low-temperature return conditions, a condensing boiler can recover additional heat from water vapour in the flue gases.

System design, return-water temperature, controls and operating conditions all influence actual boiler performance.

XtraTech Stainless-Steel Heat Exchanger

A major feature of the Clas One range is Ariston’s XtraTech™ stainless-steel heat exchanger.

Ariston identifies the XtraTech heat exchanger as a core feature of the CLAS ONE platform. The design uses larger internal waterways intended to support water circulation through the primary heat exchanger.

This is an important product entity for searches involving:

• Ariston XtraTech boiler
• Ariston stainless-steel heat exchanger
• Ariston Clas One boiler
• Ariston condensing boiler

Modulation Ratio

The CLAS ONE range uses a 1:7 modulation ratio in the manufacturer’s published specifications for applicable models.

Modulation allows the boiler to adjust its combustion output according to heating demand rather than operating continuously at maximum output.

Actual operating performance depends on system design, heating demand and controls.

Automatic Combustion Control

The Clas One range incorporates automatic combustion-control technology designed to adapt the air/gas mixture during operation.

This is intended to support controlled combustion across changing operating conditions.

The exact gas configuration must still match the appliance specification and applicable LPG setup.

LPG Gas Configuration

This product is marketed for LPG operation.

Ariston’s European CLAS ONE documentation identifies the standard CLAS ONE models as natural-gas appliances that can be converted to LPG using the appropriate supplied conversion kit.

For this EuroFuelSupply listing, customers should confirm whether the appliance is supplied:

1. already configured for LPG, or
2. as a natural-gas appliance with the manufacturer’s LPG conversion kit.

Do not assume the gas configuration without checking the exact stock item, product documentation and conversion-kit contents.

Domestic Hot Water

The Clas One 30 provides domestic hot water through its combi-boiler configuration.

Ariston specifies a maximum useful DHW output of approximately 28.7 kW for the 30 model.

Actual hot-water performance depends on:

• Incoming water temperature
• Water pressure
• Required outlet temperature
• Cold-water flow
• Gas supply
• Appliance configuration
• System conditions

Compact Wall-Mounted Design

The CLAS ONE range is designed as a compact wall-mounted boiler.

The manufacturer’s European specifications list dimensions for the Clas One 30 of approximately:

400 mm wide × 315 mm deep × 745 mm high.

Always confirm the exact dimensions and required service clearances against the current installation manual before installation.

White Finish

This EuroFuelSupply product is listed in a white finish, making it suitable for conventional indoor boiler-room, utility-room or kitchen installations where the appliance is visible.

The finish should not be confused with the appliance’s technical configuration; gas type, model, flue and installation requirements should always be checked separately.

Technical Specifications

Ariston’s French documentation lists the CLAS ONE 30 with heating seasonal efficiency of 94% / ErP Class A, while the European CLAS ONE documentation identifies the 30 model’s technical outputs and dimensions.

Energy Efficiency

The Clas One range is designed as a condensing gas boiler, and Ariston’s European documentation lists the heating seasonal efficiency of the CLAS ONE models at 94% with an A heating energy class in the referenced configuration.

Actual system efficiency depends on:

• Boiler operating temperature
• Return-water temperature
• Heating controls
• Weather compensation
• Radiator or underfloor-heating design
• Building heat loss
• System maintenance
• User settings

Avoid treating the ErP rating as a guarantee of a particular fuel saving.

Low-NOx Gas Boiler

The Clas One platform is designed with modern combustion technology and is listed by Ariston with NOx Class 6 in its published technical data for applicable configurations.

NOx classification is an important consideration when comparing modern condensing gas boilers.

Local requirements should always be checked before installation.

Applications

The Ariston Clas One 30 LPG combi boiler can be considered for appropriately sized:

• Houses
• Apartments
• Villas
• Holiday homes
• LPG properties
• Rural properties without mains natural gas
• Replacement boiler installations
• Residential renovation projects
• New heating installations

Correct boiler sizing should be based on the property’s heat-loss calculation and domestic-hot-water requirements.

LPG Boiler for Properties Without Mains Gas

The Clas One 30 can be relevant where a property uses LPG rather than mains natural gas.

LPG installations require appropriate:

• LPG storage
• Gas pressure
• Gas pipework
• Regulators
• Flue arrangement
• Ventilation/combustion provisions where applicable
• Gas safety controls
• Appliance configuration

A qualified heating/gas professional should verify the complete installation before commissioning.

Ariston Clas One 30 vs 24

The CLAS ONE range includes several output sizes.

The Clas One 30 provides greater heating and domestic-hot-water output than the 24 model.

Ariston’s current documentation lists the CLAS ONE 24 at approximately 21.4 kW maximum useful heating output at 80/60°C, compared with approximately 27.4 kW for the 30 model.

The correct boiler should be selected from the calculated heating load and hot-water requirements rather than choosing a larger model simply because it has a higher nominal rating.

Ariston Clas One 30 vs 35

The Clas One 35 is the larger model in the standard 24/30/35 range.

Ariston lists approximately:

• Clas One 24: 21.4 kW useful heating output at 80/60°C
• Clas One 30: 27.4 kW
• Clas One 35: 30.2 kW

The 35 model also has higher domestic-hot-water capacity.

For a specific property, the correct size should be established from heating-load and DHW calculations.

Is the Ariston Clas One 30 an LPG Boiler?

The CLAS ONE platform is available in gas configurations that can be converted to LPG using the applicable manufacturer kit. Ariston’s European documentation specifically states that the CLAS ONE natural-gas models can be converted to LPG via the supplied kit.

For this EuroFuelSupply product, verify the exact LPG configuration supplied before installation.

Is the Clas One 30 a Combi Boiler?

Yes.

The standard Clas One 30 is a combination boiler designed to provide both central heating and domestic hot water.

It is different from the Clas One System, which is a heating-only system boiler designed to work with a separate hot-water cylinder. Ariston lists the System version separately.

What Is the Ariston Clas One 30 Heating Output?

The maximum useful heating output is approximately:

27.4 kW at 80/60°C

and approximately:

30.0 kW at 50/30°C.

This distinction is important when comparing condensing boilers.

Does the Clas One 30 Need a Gas Flue?

Yes.

As a gas-burning condensing boiler, it requires an approved flue arrangement appropriate to the appliance and installation.

Ariston lists multiple approved flue connection configurations for the CLAS ONE range, including C13, C33, C43, C83, C93 and other configurations depending on the installation.

The exact flue system must be designed and installed according to the current Ariston installation instructions.

Professional Installation

The Ariston Clas One 30 LPG boiler is a gas appliance and must be installed and commissioned by an appropriately qualified professional.

The installation should comply with:

• Current Ariston installation instructions
• LPG regulations
• Local building regulations
• Gas safety requirements
• Flue requirements
• Electrical requirements
• Condensate drainage requirements
• Appliance clearance requirements
• Destination-country regulations

The exact requirements differ between European countries.

Buy Ariston Clas One 30 kW LPG Combi Boiler in Europe

The Ariston Clas One 30 kW LPG Condensing Combi Boiler is designed for customers looking for a wall-mounted condensing boiler providing both central heating and domestic hot water.

EuroFuelSupply supplies heating and energy equipment for residential, installer, trade and commercial requirements across European markets.

Before ordering, confirm:

• LPG configuration
• Exact model
• Flue requirements
• Installation country
• Required boiler output
• Electrical supply
• Gas pressure
• Accessories required

For trade, installer or project quantities, provide the destination country and required quantity when requesting a quotation.