Ariston Clas System ONE 30 kW System Boiler with Free Flue and LPG Conversion Kit - 8 Years Warranty ClasSystemOne30

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Why buy me
  • Unique 'AUTO' function optimises efficiency of boiler and system
  • 30KW System Condensing Natural Gas / LPG Boiler
  • Great for a 2-5 bedrooms houses or large properties with simultaneous high hot water demand
  • A Rated
  • Energy Saving Trust recommended
More Info » Tech Spec »
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Product Information

What stands out

  • Unique 'AUTO' function optimises efficiency of boiler and system
  • 30 KW System Condensing Natural Gas / LPG Boiler
  • Great for a 2-5 bedrooms houses or large properties with simultaneous high hot water demand
  • A Rated
  • Energy Saving Trust recommended
  • 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 vast majority of UK households rely on a combi boiler for their heating and hot water. However, in some situations a system boiler may be a much better alternative. Combi boilers are not suited for homes that have a high demand for hot water as they are only designed to support one outlet at a time. Because combi boilers typically switch the burner from heating to hot water when there is demand, heating performance can also be impacted in high demand or very large households.  A system boiler, in contrast, features a separate cylinder for storing hot water. Although the major heating and hot water system components are built into the boiler, the hot water is stored in the cylinder. This means that a constant supply of hot water can be provided to a large number of taps and showers at the same time. This makes it the ideal choice for a home with multiple bathrooms or small offices.
The stylish Italian Designed Ariston Clas System ONE 30kW Natural Gas/ LPG Condensing System 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 similar 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 Systerm ONE is the latest generation of Ariston Thermo's condensing system 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 Energy Trust  recomended 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 System One is also available as a 18kW unit and 24kW 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

  • ErP Efficiency: 90%;
  • ErP: A
  • System Boiler
  • Fuel Type: Natural Gas / LPG
  • Central Heating Output: (kW) 30
  • Manufacturer Product Number: 3301046 / 3318073
  • Shipping Weight (kg) 29
  • Product Height (mm) 745
  • Product Width (mm) 400
  • Product Depth (mm) 331
  • Warranty ( Years ) 8
  • Controls: Keys
  • Display: LED Display
  • Built in mechanical clock with 30 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) 30
Heating Output (W) 28
BTU (British Thermal Unit) 103000
Installation Type Wall mounted
Colour White
Brand Ariston
Control Type Buttons
Display type LCD
Energy Rating A
Power 220-240v 50hz
Warranty 8
Dimensions & Weight
Height (cm) 77
Width (cm) 40
Depth (cm) 38.5
Weight (Kg) 31.1

Finance Options

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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 12 Months 14.90% 12 months : £85.29 £1,023.39
PayPal Credit 4 Months 0.00% 4 months : £238.00 £949.98
PayPal Credit 36 Months 14.90% 36 months : £32.46 £1,168.27
PayPal Credit 6 Months 14.90% 6 months : £164.85 £989.07
PayPal Credit 24 Months 14.90% 24 months : £45.60 £1,094.33

Representative Example

Assumed credit limit £1,200, Representative 21.9% APR (variable), Purchase rate 21.9% p.a. (variable)

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