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Last updated: 26th October, 2022


Viessmann vs Alpha Boilers, Which is better?

Viessmann vs Alpha Boilers, Which is better?

When choosing between a Viessmann or Alpha boiler it can be hard to decide, especially when they all seem to be offering the same promises of reliability, durability and efficiency.

At iHeat, we only install the best boilers including Viessmann and Alpha. In this guide, we’re going to be looking at what makes each of them great and which would be most suitable for your home.

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An Introduction to Alpha

Founded in 1966, Alpha Heating Innovation is recognised as one of the leaders of the UK’s heating industry and is the market leader in its country of origin, Italy.

With over 50 years’ experience, they combine traditional business values with a highly innovative approach, delivering comprehensive heating and hot water solutions that are designed to meet the needs of every home.

An Introduction to Viessmann

Viessmann is a family-owned company that was founded in 1917 by Johann Viessmann and has since grown very popular in Germany and the rest of Europe, becoming leaders in the commercial heating space long before they entered the UK domestic market.

However, in more recent years, Viessmann boilers have started to appear in more and more UK homes as their advanced German engineering and innovation become more well-recognised.

When comparing these two renowned boiler brands, we’ll be taking a look at four main factors - energy efficiency, technology, price and length of warranties as well as comparing two of their most popular boilers, the Alpha E-Tec 28kW and the Viessmann Vitodens 050-W 29kW.


Energy Efficiency

The Alpha E-Tec offers an impressive energy efficiency percentage of 93% and has a hot water flow rate of up to 12.1 litres per minute thanks to its high efficiency Grunfod pump and hydroblock assembly.


You can purchase an Alpha E-Tec 28kW for as little as £1,595 including installation with iHeat. These boilers are at the lower end of the price range and are incredibly affordable.

Although the Alpha E-Tec is cheaper than the Viessmann Vitodens, you certainly won’t be compromising on quality as Alpha uses only the best components and follows exceptionally high manufacturing standards.


If our word on how great these boilers are isn’t enough, you can rest assured with 7 years guarantee on a brand new Alpha E-Tec 28kW when installed with iHeat.*


Energy Efficiency

This exceptional Vitodens 050-W definitely comes out on top as the most efficient boiler with an A rating and up to 97% efficiency.

This boiler will seriously cut fuel costs whilst being incredibly reliable and offering the highest quality with its new stainless steel heat exchanger, making it extra robust whilst consuming relatively little natural gas.

An exceptionally quiet operation means you won’t even notice as it works hard to provide you with heating, instantaneous hot water and an impressive hot water flow rate of 12.4 litres/min.


Viessmann uses Inox, the highest grade of stainless steel, which they manufacture exclusively in-house, making it incredibly reliable and less likely to get clogged or corrode.

It also doesn’t require special fluids in the same way aluminium heat exchangers do and are compatible with clean water. This decreases the chances of damaging it, therefore increasing it’s chances of a longer lifespan.

This combi boiler will also integrate into any home with compact dimensions (707x400x350mm) and low weight (37kg), without compromising on quality. With its easy to use LCD display and interface, you can control your heating to match your lifestyle and preferences.


Whilst a little more expensive than the E-Tec, the Viessmann Vitodens 050-W 29kW is another affordable boiler which you can purchase for as little as £1,865 including installation with iHeat.

If you’re wondering why you should pay more for a Viessmann boiler, it’s important to remember that Viessmann manufacture their stainless steel heat exchangers in house which is more expensive than sourcing cheaper aluminium from third parties.

So whilst you are paying more, it is definitely worth it to ensure a longer boiler lifespan.


Still unsure about the reliability of a Viessmann? To ensure you get your money’s worth, you will receive a 10 year warranty on a Viessmann 050-W 29kW when installed with iHeat.*

So Which Should You Choose?

It depends...

If you’re looking for an incredibly affordable and compact boiler for a small-medium sized home without compromising quality and efficiency then the Alpha E-Tec is ideal for you.

With an energy efficiency percentage of 93% and a hot water flow rate of 12.1 litres per minute (which actually beats the Vitodens), you can expect plenty of hot water and lower heating bills.

On the other hand, if you’re looking for an extremely efficient boiler that both looks and plays the part with its inox heat exchangers and superior technology, then the Viessmann Vitodens 050-W 29kW is the boiler for you.

Whilst the Vitodens is a little more expensive than the E-Tec, it’s important to note that Viessmann surpasses Alpha in almost all aspects.

The Vitodens 050-W is more energy efficient than the E-Tec, with its 97% efficiency and their technology is also far more superior with their Inox heat exchangers as well as it’s 10 year warranty compared to the 7 year warranty with Alpha.* They also have a much sleeker design which makes them look great in any home.

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Whichever boiler you go for, you can be sure to get the best deal with iHeat or a price match guarantee. Get a free, fixed quote on a new Alpha or Viessmann boiler today.

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Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.