Ariston Clas ONE 38 kW Combi Gas Boiler with Free Flue and LPG Conversion Kit - 8 Years Warranty ClasOne38

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Product Information

What stands out

  • Unique 'AUTO' function optimises efficiency of boiler and system
  • 38 KW Combination Condensing Natural Gas / LPG Boiler
  • Direct hot water and heat from radiators on the best priced package great for a large homes, with 2 or more bathrooms and a high demand for heating and hot water
  • 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 38kW 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

What stands out


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 38 kW, suitable for large homes, with 2 or more bathrooms and a high demand for heating and hot water. For properties that need a boiler with a lower output the Ariston Clas One is also available as a 24kW and 30kW 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 ) 15.5
  • ErP Efficiency: 90.1%;
  • ErP: A
  • Combination Boiler
  • Fuel Type: Natural Gas / LPG
  • Central Heating Output: (kW) 38
  • Manufacturer Product Number: 3301045/ 3318073
  • Shipping Weight (kg) 33.4
  • Product Height (mm) 745
  • Product Width (mm) 400
  • Product Depth (mm) 385
  • Warranty ( Years ) 8
  • Controls: Touch Digital
  • 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 Capacity (Kw) 38
Heating Output (W) 31
BTU (British Thermal Unit) 130000
Installation Type Wall mounted
Wall mountable
Colour White
Brand Ariston
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) 33.4
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