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Ariston Clas ONE 30 kW Combi Gas Boiler with Free Flue and LPG Conversion Kit - 8 Years Warranty ClasOne30

Quickfind code: 1483610
Save £179.99
or £33.60 a month more info

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Why buy me
  • Unique 'AUTO' function optimises efficiency of boiler and system
  • 30 KW Combination Condensing Natural Gas / LPG Boiler
  • Direct hot water and heat from radiators on the best priced package great for a 2-5 bedrooms house
  • A Rated
  • FREE Ariston Standard Horizontal Flue Kit worth (3318073)
More Info » Tech Spec »
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payment options

We now accept Amazon Pay!
In the basket, press the ‘Pay with Amazon’ button and use the same login details as you would on Amazon’s site and all your saved cards and addresses can be used to complete your order much quicker, without needing to enter any new details with us.


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Product Information

What stands out

  • Unique 'AUTO' function optimises efficiency of boiler and system
  • 30 KW Combination Condensing Natural Gas / LPG Boiler
  • Direct hot water and heat from radiators on the best priced package great for a 2-5 bedrooms house
  • A Rated
  • FREE Ariston Standard Horizontal Flue Kit worth  (3318073)
  • Includes Free LPG Conversion Kit
  • Xtratech stainless steel heat exchanger
  • High domestic hot water flow rates
  • Unique 'AUTO' function optimises efficiency of boiler and system
  • Comfort function
  • High efficiency pump
  • 1:7 Modulation
  • Quiet operation starting at 49db
  • Frontal pressure Gauge
  • Built in mechanical clock with 24 hrs on/off timer
  • Large backlit display
  • Ariston net compatible
  • Easy installation and maintenance
  • Complete with an exceptional 8 year guarantee from Ariston for total peace of mind

The details

The stylish Italian Designed Ariston Clas ONE 30kW Natural Gas/ LPG Condensing Combination Boiler comes with a host of high-end features including the new Stainless Steel Xtratech™ heat exchanger which is able to perform better and more efficiently than ever before and with a unique AUTO function - used to optimise the efficiency of the boiler and heating system.
Lightweight and easy to install, the new boiler also has all connections in the same places – enabling an easy retrofit in place of an existing Ariston boiler.
Boiler Pack comes complete with £100 worth of Free Accessories
FREE Ariston Standard Horizontal Flue Kit (3318073) and LPG Conversion kit


The top of the range Clas ONE is the latest generation of Ariston Thermo's condensing combi gas/ LPG boilers, offering heat management with smart connectivity right out of the box and patented stainless steel XtraTech™ heat exchanger. This brand new flagship comes Boiler Plus ready and with a massive 8-year warranty.
 This is a highly efficient boiler, boasting an ErP A+ rating and is fully Boiler Plus compliant. An output rating of 30 kW, suitable for standard 2-5 bedrooms homes. For properties that need a boiler with a higher output the Ariston Clas One is also available as a 24kW and 38kW unit.


Stainless steel heat exchangers are exceptionally robust and operate well in a wide range of pH values, providing resistance to corrosion.
142% wider waterways with increased efficiency
Wider pipes allow water to pass through the heat exchanger more effectively, with less risk of blockages from debris. This extra width also allows hot water to pass through the heat exchanger quicker.
Better transfer of heat
The enhanced single coil heat exchanger is robust and highly efficient, thanks to an improved condensing surface and increased hydraulic performance. This also allows for constant water speeds and a reduced chance of blockages, ensuring a long lifespan.

Essential info

  •  DHW Flow Rate ( litres per minute ) 10.4
  • ErP Efficiency: 90.1%;
  • ErP: A
  • Combination Boiler
  • Fuel Type: Natural Gas / LPG
  • Central Heating Output: (kW) 30
  • Manufacturer Product Number: 3301043/ 3318073
  • Shipping Weight (kg) 29.3
  • Product Height (mm) 745
  • Product Width (mm) 400
  • Product Depth (mm) 385
  • Warranty ( Years ) 8
  • Controls: Keys
  • Display: LED Display
  • Built in mechanical clock with 24 hrs on/off timer
  • Standard Horizontal Flue Kit included
  • Installation Type: Wall Mounted / Vented

A Gas Safe registered engineer must be used to install this appliance. We would advise checking the installers licence number against the Gas Safe Register.

Item Code:

Tech Spec

Key Information
Boiler Type Combi
Fuel type Gas
Boiler Capacity (Kw) 30
Heating Output (W) 28
BTU (British Thermal Unit) 103000
Installation Type Wall mounted
Wall mountable
Colour White
Brand Ariston
Control Type On/off
Display type LCD
Energy Rating A
Power 220-240v 50hz
Warranty 8
Dimensions & Weight
Height (cm) 74.5
Width (cm) 40
Depth (cm) 38.5
Weight (Kg) 32.3

Finance Options

Spread your payments

We offer flexible payment solutions to help you pay for your new bathroom over up to 24 months. To see which options are available to you please use our calculator.

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Finance Provider Finance Options Representative APR (Fixed) Payments Total amount payable
PayPal Credit 36 Months 14.90% 36 months : £23.92 £860.83
PayPal Credit 24 Months 14.90% 24 months : £33.60 £806.34
PayPal Credit 12 Months 14.90% 12 months : £62.84 £754.07
PayPal Credit 6 Months 14.90% 6 months : £121.47 £728.78

Representative Example

Assumed credit limit £1,200, Representative 19.9% APR (variable), Purchase rate 19.9% p.a. (variable)

The example above represents the typical costs of using PayPal Credit as a standard funding method. Interest on your instalment offer is fixed for its duration. For more information please visit our finance page by clicking here, or proceed to checkout and select the "PayPal Credit" option in the checkout.

Questions & Answers

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