Viessmann Boiler Reviews: Are They Any Good?

Viessmann boilers tend to score top marks for reliability and build quality, but how do they rate for value for money?

This Viessmann boiler review compares insights from our boiler experts, impartial Which? Studies and verified Trustpilot ratings to find out: are Viessmann boilers any good? And how do they compare with other leading boiler brands like Worcester Bosch and Vaillant?

To help you decide, our boiler experts have put Viessmann boilers under the microscope - and grilled them on what really matters: value for money, range of models, efficiency and servicing.

Read on for our straight-talking Viessmann boiler review. Or save time by completing the form at the top of this page, and get free boiler quotes to compare Viessmann with some of the most trusted boiler installers in your area.

In This Viessmann Boiler Review Guide in 2018:

1. Viessmann Customer Reviews and Ratings

viessmann boiler

Viessmann may not be as popular as some of the bigger boiler brands like Worcester Bosch and Ideal, but it has top-notch user reviews and some star features that make it hard to beat for tech specs.

According to Which?'s survey of 11,571 boiler owners in the UK and Trustpilot's verified user reviews, here is how some of the top boiler brands compare to Viessmann:

Just note: Viessmann only has 9 reviews currently on Trustpilot, which is not too many to base these findings off - and although Vokera doesn't stack up to competition, these boilers are around 20% cheaper on average.

Below are the impartial ratings Viessmann boilers get from Trustpilot, Which? and our own boiler experts.

Trustpilot Score*
Which? Score*
The Eco Experts Score*
Worcester Bosch

Want the big picture? Check out our full-fat best boiler brands page here.

2. Types of Viessmann Boilers

Viessmann produces a wide range of gas condensing boilers under the company’s Vitodens brand name. Regardless of the size of your home, there is almost certainly a Vitodens boiler model that will meet your requirements. But are they any good?

When gas condensing technology generates energy it retains and converts it, too, ensuring that optimal levels of heat are delivered to properties big and small.

According to Viessmann, gas condensing boilers are the most popular system for providing heating and hot water in UK households. Certainly, they are typically much more efficient than most other types of boilers.

As well as providing affordable heating, a Viessmann boiler is simple to operate in your home.

Smart tech: Each Viessmann gas condensing boiler is fitted with tado° or ViCare smart thermostat technology, making it even easier to control your home’s central heating and water temperature, thanks to a free smartphone app that is available for both Android and Apple devices.

The small print: Just know that in order for this type of boiler to work properly, a fan-assisted flue will need to be installed (if it is not already in place), which safely vents smoke via your property’s external wall.

What kind of gas condensing boilers does Viessmann make?

There are 3 kinds of Vitodens gas condensing boilers to choose from:

  1. Combi boilers – Compact in size and designed for smaller properties, particularly those with little or no roof space.

  2. System boilers – Built for homes with more than 1 bathroom. System boilers don’t require a loft-located tank and are compatible with Solar Water Heating (SWH) systems.

  3. Conventional boilers – ideal for properties that have 2 or more bathrooms and/or low water pressure (and for whenever it’s necessary for family members to use lots of hot water at once). Conventional boilers are also SWH-compatible.

Control your boiler from your pocket: Each Vitodens boiler model comes with tado° or ViCare, a simple and efficient way to fully control your heating system via your smartphone, no matter where you are.

Whenever you want to return to a nice, warm home, simply adjust the temperature settings by using the app on your phone.

3. Viessmann’s Boiler Range

Boiler Type
Energy Output
Efficiency Rating
Smart Home Capable?
Warranty (in years)
5.9 kW to 35 kW
Yes (tado)
3 to 7
Conventional, Combi or System
4.7 kW to 35 kW
Yes (tado)
1 to 10
4.7 kW to 35 kW
Yes (tado)
5 to 10
Combi or System
35 kW
Yes (ViCare)
3 to 10
1.8 kW to 35 kW
Yes (ViCare)
1.9 kW to 26 kW
Yes (ViCare)


Which Viessmann boiler is for me? Rest assured, all the above boilers are recommended by our experienced boiler experts, and all but the 242-F Combi are Which? Best Buys to boot. But the 100-W Boiler is Viessmann’s best-selling gas condensing boiler.

Just note that for many Viessmann boilers, you'll only get the full warranty period if you have your boiler installed by a Viessmann-trained engineer and registered through Viessmann’s Installer Portal.

Essentially, there are 6 Vitodens boilers available from Viessmann, and all these are ideal for homes.

Which model is for me? With at least 2 versions of each model, there’s plenty to choose from.

For instance, the Vitodens 050-W is a combi boiler that comes with energy outputs of 29 kW or 35 kW. The Vitodens 100-W, on the other hand, is available in 10 different models, offering conventional, combi and system options – and energy outputs that range from 19 kW to 35 kW.

The Vitodens boilers will help you cut your energy bills. Each Vitodens boiler comes with a high Seasonal Efficiency of Domestic Boilers in the UK (SEDBUK) rating – any boiler with a 90% score or above is given an ‘A’ rating.

4. Viessmann Boiler Prices

boiler cost

In our experience, installing new Viessmann boilers will cost you anything from £600 to £3,500, depending on the boiler you choose and the needs of your home.

You can expect to pay between £600 and £1,500 (for a small home), £700 and £2,000 (for a semi-detached or terraced property) or £900 and £3,500 for a detached home.

This table gives you an idea of what you would pay for some of Viessmann’s most popular models:

Price Range
£855 to £910
£795 to £1,500
£1,520 to £1,640
£1,150 to £1,450
£2,520 to £2,610
£5,990 to £6,190

The table above offers a guide price range for each boiler. These costs vary, as each model comes with difference specs.

How much will the installation cost? Replacing an existing combi boiler can cost in the region of £600, while for a semi-replacement of a conventional boiler you’ll be looking at a £700 price tag. Installing a combi boiler at a new site, meanwhile, could set you back around £1,100.

Are there any hidden costs? You may want any extras such as a power flush, a thermostat, a chemical flush, radiators (each with a £100 price tag) or moving pipes. For the full package, you would pay around £1,600.

5. Are Viessmann boilers any good?

  • Trustpilot rating: Great (from 9 verified user reviews)
  • Which? rating: 86%
  • Eco Experts rating:

Our boiler experts gave Viessmann an overall rating of 4 out of 5.

That’s better than Ideal (3 out of 5), on a par with Vaillant (4 out of 5) and not quite up there with Grant and Worcester Bosch (5 out of 5).

To see how Viessmann boilers compare with other brands, check out our full list of the best boilers in the UK.

How did we rate Viessmann? Of course, it pays to find out as much as possible about what customers and installers have to say about a company and its products.

6. What Are My Payment Options?

Before choosing your boiler, it’s good to bear in mind that going for the cheapest option isn’t necessarily the best long-term strategy. Paying a little more for quality will almost certainly guarantee fewer issues, not to mention smaller repair bills, further down the line.

It’s a good idea to secure 3 independent quotes from trusted suppliers before proceeding because costs can vary quite a bit. We built a quote-finder form to make this step as easy as possible.

When you have decided on the best boiler for your household, you’ll have 3 options:

  1. Use a boiler replacement company – You should have access to a number of local experts that will be able to provide several options, and many will also offer 0% financing.
  2. Contact your energy supplier for advice - British Gas, for example, supply Viessmann’s boilers.
  3. Buy direct from a supplier - And always remember: hiring anyone other than a Gas Safe-registered engineer to carry out an installation is illegal, potentially dangerous and will likely invalidate your warranty.

7. Servicing and Repairs

Break-downs are rare. Viessmann has a stellar reputation for the quality of its boilers. The company sets itself apart from rivals through its use of a stainless steel heat exchanger, which is extremely resistant to corrosion.

A cut above the rest? All Viessmann’s competitors utilise an aluminium heat exchanger that is more likely to be damaged due to a tendency to corrode much more quickly.

How often do Viessmann boilers need servicing? At The Eco Experts, we recommend an annual servicing to keep your boiler in sound working condition. That said, Viessmann offers extensive after-sales support should a fault ever develop.

Check your warranty. Of course, each Viessmann boiler comes with a warranty (ranging from 2 to 10 years), ensuring that for the length of the term, most repairs will be completely free.

Decent engineers: Viessmann has exclusive access to Gas Safe-registered engineers all around the UK. If an expert is required, he or she will come to your home fully equipped to ensure they can fix the majority of repairs there and then.

8. Viessmann Boilers: The Verdict

viessmann boiler reviews

Viessmann makes our competitive list of the UK's best boiler brands. But what sets them apart from the rest? Three things:

  1. Stainless Steel Heat Exchanger - It may not sound like much, but steel is rust-free and longer lasting than aluminium - and it's exclusive to Viessmann.
  2. Longer warranty - The average boiler warranty lasts around 5 years - Viessmann boilers give even longer peace of mind with 7 to 10 years.
  3. Smart boilers - Every Viessmann boilers comes with the tech you need to stay in control of your heating from your own smartphone.

Still not convinced? Check out our no-nonsense list of the best boilers in the UK for the low-down on the UK's leading boiler suppliers.

Or shall we cut to the chase?. if you're keen to get value for money without wasting any more time, just click here to use our free quote-finder. Plug in a few details about what you're looking for and the leading boiler installers near you will get right back in touch with some top quotes for you to compare.

Compare Viessmann and Other Boiler Quotes Here

Back to top

Spread the Word!