Helpful Guide Of Latest Best 7 Baxi Megaflo System Boiler Prices & Reviews

Ariston Thermo UK is a grounded boiler producer with a long heritage in the heating and hot water industry. The organization has worked in the UK for more than 30 years, and now offers a comprehensive scope of boilers and heated water items appropriate for family units, all things considered, from little private condos, up to enormous detached residences.

Clients can be consoled of Ariston’s obligation to quality by its industry-driving kettle guarantees. The reach besting Clas HE Evo is upheld with a 12-year guarantee as standard, underlining the evaporator’s unwavering quality and rigorous testing measures.

Moreover, Ariston additionally gives an assortment of reciprocal regulators, which not just boost energy proficiency for decreased utility investment funds yet additionally make a property holder’s lifeless complex and more helpful.

All Ariston boilers are completely upheld by the highest degrees of after-deals administration – illustrated by a ‘24/7*365’ customer service department which has a 97% success rate on the first call.

The Ariston Clas HE Evo Combi is an elite gathering combination boiler that can be bought with a yield of 24kW, 30kW, or 38kW.

As it gauges in at 810mm (H) x 490mm (W) x 420mm (D), the boiler is too large to fit inside a kitchen cupboard yet it can be wall-mounted in various other areas inside your property. Additionally, this model is a space-saving arrangement since it shouldn’t be introduced with a virus water tank or hot water cylinder.

Clas HE Evo Combi cost falls in the range of £640.95 to £1,299.00 before instalment charges are added. The boiler is ensured for a long time from the buy date however the guarantee can be moved up to 8 or 12 years in the event that you need extra inclusion.

ModelTypeDimensionsMax Flow RateOutputEfficiencyPrice
Ariston Clas HE Evo 24CombiH- 595 mm W- 400 mm D- 295 mm10.324 kWA£640.95
Ariston Clas HE Evo 30CombiH- 810 mm W- 490 mm D- 420 mm12.930 kWA£659
Ariston Clas HE Evo 38CombiH- 810 mm W- 490 mm D- 420 mm15.638 kWA£1299

The Clas HE Evo Combi is accessible in three outputs, it’s appropriate for little, medium, and huge measured properties. This boiler is additionally an extraordinary alternative for homes absent a lot of space or extra room since you don’t require cumbersome tanks or cylinders. The 24kW unit is ideal for lofts and more modest abodes with 1 washroom and around 10 radiators, and the 30kW form ought to fulfil the requirements of a medium home with 1 restroom, 1 ensuite, and up to 15 radiators. Then there’s the more remarkable 38kW combi, which is best for bigger properties with 2 restrooms and more prominent heating and boiling water prerequisites. Be that as it may, this is just a harsh guide, and you should ask a Gas Safe designer to survey your normal use propensities preceding buying this model.



  • A-rated efficiency combi boiler
  • Stainless steel heat exchanger
  • Auto function which consumes less gas and electricity
  • Comfort mode     
  • Low level of operating noise   
  • user-friendly clear display panel        
  • Compatible with energy saving controls      
  • 5-year parts and labour warranty       


  • Struggles to meet high demands of water
  • Slower water rate


  • Make Ariston
  • Model- CLAS HE SYSTEM evo 30 System Gas Boiler
  • Is Condensing- Condensing
  • Efficiency Rating- 90%
  • Band Rating- A Rated
  • LPG Compatible-Yes
  • Standard Warranty- 5 Years
  • Central Heating Max. Output- 24 kW, 30kW, 38 kW
  • Mounting- Wall Mounted
  • Flow Rate- 10.3, 12.9 and 15.6
  • ERP Rating A Heat

Buying Guide

Combi Boilers

How they work:

Combis work as sealed systems, providing hot water for both the taps and central heating system, heating the water directly from the mains as and when it is needed — meaning there is no need for a hot water storage cylinder, or a cistern in the roof space.


Combis are quicker, easier, and cheaper to fit than system boilers, as well as space-saving due to the lack of a cylinder or cistern. Water is delivered at mains pressure, so you can enjoy a more powerful (although not ‘power’) shower.


It’s a priority system, so it only satisfactorily deals with one heating need at a time. While fine for small families with one-bathroom, larger families will experience poor flow rates when multiple outlets are used at once. Performance is also dependant on the diameter of the pipe entering the property: if it’s less than 22mm, then a combi is a bad choice.

System Boilers

How they work:

System boilers are fitted to sealed heating systems, but unlike combis work on the principle of storing hot water in a cylinder, so they can feed several outlets at once at mains pressure. There’s no need for a cistern in the loft and the expansion vessel is built in.


Ideal for larger homes with higher demands, and as they have most of their major components built-in (i.e., expansion vessel and pump), installation is quicker, cheaper, and neater. Flow rates are usually high as water is delivered at mains pressure, and hot water is instantaneous.


Will run out of hot water if overused. Some installers claim they are more complex and prone to problems than regular boilers, such as pressure loss.


Regular Boilers

In a sealed circuit, the system is filled to approx. 1 bar pressure and then sealed. Unlike an open-vented system, there is no cistern, so an expansion vessel handles excess water. Sealed systems are more efficient.

How they work:

Regular boilers are now largely bought as replacements for homes with an open-vented heating system (i.e., supplied by means of a feed and expansion cistern in the roof space, meaning the system is open to air). Like system boilers, they work on the principle of stored water and require a separate hot water cylinder.


The water out of the taps will be at a good flow rate (not to be confused with pressure) and hot water can be supplied instantaneously. This is the ideal setup for a ‘power’ shower, which requires a cold-water feed from the cistern and a separate electric pump.


They’re more expensive to install, needing more components and pipework, and also take up more space. They can suffer from low pressure if the cistern is not located high enough, meaning additional shower boosters may be required. Hot water can run out.

Expert Views On Ariston Clas HE Evo

This high efficiency COMBI boiler combines the performance, quality and reliability you’d expect from Ariston. Stylish and compact, the CLAS HE evo helps to cut energy bills and reduce carbon emissions. The simple controls, backlit LCD display, pressure gauge, time clock and intuitive button layout make it easy to manage warmth and comfort to your home.

With global expertise and a deep understanding of consumer needs, Ariston has earned millions of families across the globe. Throughout their half-century lifespan, they’ve been constantly developing and redesigning their products. This has catered for installers and customers alike for smooth installations and maintenance processes.

As with many manufacturers, their most popular boiler types are their combi boilers. Their combi boilers in particular save a lot of space, making them ideal for smaller properties with 1-3 bedrooms and 1-2 bathrooms.

Research Methodologies Used For Our In-Depth Research

  • Erp rate for heat: (A)
  • Efficiency Rating: 90%
  • Decible range: 49 -50 decibles

This boiler has its own special auto function technology that is exclusive to Ariston, this helps your boiler to be more efficient as well as save you money on your energy.

Compatible with Ariston Cube S Net or Sensys Net, also compatible with other programmable and smart controls like EPH and Nest.

An auto-diagnostic by-pass gives you the security that in the event that your boiler does break down you will know what the problem is and be able to get it fixed. A range of wired and wireless controls are available for this model. When the auto function is on your boiler manages the room temperature and will choose the ideal output for your heating and gradually increase the power of the boiler until the room has reached a comfortable temperature.


 What Different Types of Boilers Are Available?

There are a few different types of modern boilers on the market, and deciding between them can be difficult.

The boiler you’re most likely to have installed is a combi boiler. As the name suggests, these boilers combine a water heater and central heating system in one package. This means you don’t need an external water tank.

A system boiler does require an external tank. However, this only stores hot water and all of the heating is carried out by the boiler itself.

The third type of boiler you might come across is a standard boiler. These boilers need hot and cold-water tanks and are usually more suited to older homes with existing heating and storage systems.

2. How Do I Choose between Different Boiler Brands?

Choosing between different brands of boiler can be confusing at first, but each brand brings its own advantages and selling points.

3. How Often Should I Replace My Boiler?

The general lifespan of a boiler is around 10 to 15 years. While this is an average, your boiler may last longer if you take care of it well.

You should decide to replace your boiler when repairs become too expensive or start mounting up. Opting for a new boiler at this point should save you money in the long run.

An expert engineer should be able to help you decide on the right time to replace your boiler.

Did You Know?


Water retains heat very well, so what boilers do is simply apply heat—either by burning natural gas, or running electricity through a heating element—to water.

Once the water is hot, it is pumped through pipes into a room, where the heat naturally radiates and warms the air up.

Gas burning furnaces differ, in that they heat the air first, in the furnace, then a fan pumps the warm air through air ducts where it finally comes out of vents.


Very few boilers in today’s world get water all the way up to the boiling point to vaporize it into steam.

While some high-grade models will do this for industrial purposes, the typical general consumer boiler only needs to hit about 140° for keeping rooms comfortable.


While it’s true that a gas burning furnace can dry out the air in a home, since it replaces room air with “burnt” air from the furnace itself, the opposite is not true for water-based boiler heating.

If there’s a break or defect in your system, and water is leaking out, you may get some condensation or humidity. But in a working system, only heat is transmitted, water makes no contact with the air and thus has no effect.

Customer Reviews

Have had ariston combi boilers in properties for years with no issues,,

Had an Ariston CLAS HE 38 Kw boiler fitted by Total Domestic Heating Limited and can confirm that they did a first class installation, no mess or fuss and also carry out the annual service. I found this company easy to deal with, being polite and punctual and was very pleased with the work carried out. I can recommend this Ariston boiler for being reliable and efficient and would not hesitate to replace it with another Ariston boiler at some point in the future.

Just had a 38 Clas One boiler fitted as our existing one was beyond economical repair. Found that the Ariston hot water flow rate much improved compared to our previous boiler also the boiler is remarkably quiet. The radiators heat up very quickly, the app to control the heating is very user-friendly. Overall we are very happy with our new boiler and wouldn’t hesitate to recommend Ariston.

Real World Use cases


When getting Ariston Clas HE Evo Combi cites, make certain to search around so you can analyze costs and locate the most serious arrangement. It’s critical to ensure you get a cost on both the boiler and establishment to keep away from any awful amazements further down the line. Likewise, you need to check that your installer is Gas Safe enrolled and lawfully allowed to chip away at gas machines prior to permitting them into your home. To affirm this, request to see the subtleties on their ID card or run a hunt at the official Gas Safe Register site. On the off chance that you need to save time, kindly don’t hesitate to utilize our free online assistance to get no-commitment cites from respectable boiler suppliers and enrolled engineers.

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