Viessmann Boiler Reviews 2021

Viessmann Boiler Reviews 2021

Here is what we will cover:

• Who are Viessmann?
• How HomeSage’s ranking system works
• Viessmann’s top 10 combi boilers
• How do Viessmann compare with other manufacturers?
• Best Viessmann boilers for 1-2 bed houses (up to 27kw)
• Best Viessmann boilers for up to 3-4 bedroom houses (28-34kw)
• Best Viessmann boilers for 4+ bedroom houses (35kw+)

Introduction to Viessmann

Viessmann is a German company founded in 1917 and, today, they have 23 production companies spread over 12 countries, offices in 74 countries, and sales centres in 120 countries around the world.

They are a heating and refrigeration company offering German engineering and cutting-edge technology throughout their range of products.

Are you thinking of upgrading your boiler? If so, you need to choose from the three types available – but you should definitely get expert advice before making a decision. That’s why we’re here!

A regular or a system boiler both require extra storage facilities to house the water storage tanks and they can be more expensive to run and install.

Combi-boilers are recommended for most properties in the UK because they’re much smaller in size, they help save money on your gas bills, and they’re now much more environmentally friendly. 

In this review of Viessmann gas combi boilers in 2021, we’ll cover:

• who Viessmann is
• what a combi boiler is
• the key stats you need to know about combi boilers and what they mean
• the top 10 Viessmann boilers according to HomeSage’s exclusive grading guide
• Viessmann vs other manufacturers – what do customers think?
• Viessmann’s top 5 gas combi boilers up to 27kw
• Viessmann’s range of three gas combi boilers from 28kw to 34kw
• Viessmann’s range of five gas combi boilers with 35kw+ output

In this article, we’ve scored each of the top ten gas combi-boilers from Viessmann according to our exclusive online grading guide.

We’re HomeSage – we work alongside a network of trusted, established Gas Safe boiler installers up and down the UK.

We help to save you up to 54% on the total cost of the supply and installation of your new boiler – simply fill in a form anywhere on this page.

Once you have sent us your details, we forward these on to boiler installation companies that service your area.

These companies are keen to give you the most competitive quote to win your order and some customers have reported a 54% difference between the highest and lowest quotes, so shopping around is always worthwhile!

Who are Viessmann?

Viessmann is a truly international heating technology company and they employ over 12,000 people worldwide.

They are headquartered in Germany and the firm has been family-owned for over 4 generations. 

They are dedicated to environmental sustainability alongside engineering innovation and celebrating the people they work with.

They have a wide range of heating solutions and provide services for both domestic and industrial use.

They are dedicated to education in the heating and HVAC sector.

The Viessmann Academy is located in Allendorf, Germany, and provides a comprehensive programme of training courses for over 92,000 industry specialists each year.

What is a combi boiler?

A combi boiler provides your property with hot water and heating almost instantly directly drawn from the mains water source and pumped to your hot taps and radiators.

When you turn the hot tap or heating on, the water you require is immediately heated by an internal gas-ignited heat exchanger.

This means that you have hot water whenever you need it without waiting for it to heat up.

Combi boilers are the most popular choice for UK properties because they are relatively small compared to regular or storage boilers, they don’t require extra space for storage tanks, and there is no need for additional pipework (unless you are moving your boiler to a new location in your property).

Because there are so many variations of combi boilers on the market today – Viessmann currently have 15 models to choose from – you can select a solution to suit the size of your property you live in and your family’s heating and hot water needs.

Getting the right boiler means your gas bills will be as low as possible and you won’t waste energy that adds to your environmental footprint. 

For more info you might also want to read our article on the best combi boilers on the market in 2021!

Key combi boiler stats

The best boiler for your property depends on how many radiators you have and the level of hot water you and your family members require.

The more hot water you think you will need, the higher the output and water flow needs to be, too.

Combi boiler flow rate

The flow rate refers to the amount of water that can be warmed as it passes through the heat exchanger.

If your boiler has a water flow rate of 11 litres per minute, that is the maximum amount of hot water the boiler can produce on demand as long as the mains water supply will allow it.

What does that mean?

If the mains water supply only has a limit of 10 litres per minute, no matter what your boiler flow rate is, the maximum amount you can get is still 10 litres per minute. 

Combi boiler output

The boiler output refers to the amount of energy the boiler uses to perform.

It is measured in kW and it tells you how much it will cost to run your boiler.

To work it out, you take the output rate and multiply it by the price of a unit of gas.

For example, if your boiler has an output of 40kW and a unit of gas is 4p, the equation is 40 x 4p which equals £1.40.

It’s necessary to know the boiler output not just for working out the cost but to make sure you get the right power level for your needs.

If you have a boiler with an output too high for the size of your property you will end up paying more money than you need to pay on your gas bills.

If the output is too low, you will struggle to get enough hot water for your requirements.

Combi boiler energy efficiency rating

The energy efficient rating for boilers is worked out on how much energy it takes to heat the water compared to ‘lost’ energy used by the boiler itself. 

If a boiler is 95% efficient, only 5% is lost on the boiler.

If a boiler only has an efficiency of 60%, that’s a staggering 40% energy loss which is not only very inefficient but will cost you more money and isn’t great for the environment.

Much like fridges and washing machines, boilers are rated on their energy efficiency on a grading system of ‘A’ to ‘G’, with ‘A’ being the most effective of over 90%.

Most modern combi-boilers are usually either grade ‘A’ or ‘B’, which both offer increased cost-savings compared to less efficient systems. 

How HomeSage’s Rating System Works

To make it simple for you to make an informed choice, here at HomeSage we have devised a unique online ranking system that identifies the benefits of each model.

• We rank boilers based the type of fuel the boiler uses (as gas is the cheapest option by far, each gas boiler gets a maximum score for this automatically),
• the length of the guarantee,
• the energy efficiency rating, and
• genuine customer reviews and average ratings from Trustpilot.

Viessmann’s top ten gas combi boilers

There are over 750 combi boilers on the market today and we hope this system helps you narrow down your decision. 

Viessmann currently manufactures 15 different gas combi boilers.

Our top ten Viessmann gas combi boilers, according to the HomeSage ranking system, are:

How does Viessmann compare with other manufacturers?

According to our data, Viessmann finishes seventh for the number of reviews on Trustpilot and they are in joint fifth position with the same average score as Grant and Vaillant.

Where a company has more reviews but the same average score as another, the one with the higher amount of reviews is placed higher up on the table. 

What do customers on TrustPilot say about Viessmann?

Happiness with the product

With over 1,000 reviews on Trustpilot and 91% in total deeming them either ‘excellent’ or ‘great’, most customers are happy with their Viessman experience.

In total, only 7% of consumers reviewed them to be ‘bad’ or ‘poor’. 

Here are some recent reviews of Viessman from the Trustpilot website:

On the 17^th June 2020, Tracy Home reviewed:

“Had the Vitodens 100W boiler fitted by iHeat a few days ago as my old boiler was about to die. Modern, quiet and improved hot water throughout. Not needed to use the heating yet but all straightforward. Very impressed with the iHeat booking and installing system. Engineer was a 10-year British Gas veteran. All warranty paperwork sent through swiftly. Boiler had a Which Best Buy and the 10 year warranty was a definite selling point for me. Very happy with it.’

On the 28^th May 2020, Mr Andrew McArthur wrote:

“Boiler is a vast improvement to our previous boiler. Noticeable difference in terms of output and effectiveness and far more efficient.”

Paul reviewed on the 20^th April 2020 that he had experienced:

“Poor boilers and hard to get the right parts, booklet has several gas council numbers and none help get the parts some cannot be used with Nest or Hive due to built-in external air sensor and so many sensors fitted in series. Technical were no help and advised replacing the control board on a 9 year old boiler at a cost of £450.” 

The guarantee period and after-sales service

Viessmann offers a standard 2-year guarantee for all boilers whichcovers either fixing or replacing any manufacturer production faults or material defects free of charge.

Depending on what boiler you opt for, you may also receive a comprehensive 5-year parts and labour warranty.

You also have the option to extend this providing the services and repairs are carried out by a Viessmann Trained Installer.

Below, we present a small sample of recent user comments covering their experiences with the Viessmann warranty and after sales service.

On the 7^th June 2020, Lorraine reviewed:

“Our Viessmann boiler developed a leak last week, we contacted the company who installed it and they were closed due to the Corona-virus lock-down. We managed to work out that the boiler was still under warranty so called the Viessmann customer service line. 

The service we received was excellent, they confirmed that the boiler was still under warranty, and that an engineer would be with us the following day. The engineer called us to confirm our address details, discuss our problems, and said he would be with us by 9am the next morning. 

He arrived a few minutes early and had brought everything he needed to repair our leaking boiler. Many thanks to all the UK staff who helped in these difficult times.”

On the 18^th May 2020, Phil from Essex stated he:

‘Couldn’t fault anything. Great service, great fitting, great boiler!!’

On the 25^th January 2020, Darren Rickard wrote:

‘A full 2 weeks now of waiting for answers on technical queries. Viessmann has my email and my contact number, some of the queries were raised 6 months ago! Assistance is non existent, especially in my area.’

Viessmann’s top 5 gas combi boilers up to 27kw

You should choose a boiler up to 27kW if you live in an apartment or a 1 or 2 bed terraced house with under 10 radiators.

These boilers are suitable for properties with 1 bathroom.

Viessmann B1KC Vitodens 100-W 26kw Boiler (78.93% HomeSage score)

This boiler is a traditional-looking white gloss finish system, measuring in at 700mm x 400mm x 350mm.

It benefits from a large, backlit LED display so is easy to read in dimly lit rooms or cupboards, and the control panel is straightforward to use. 

It has a Inox-Radial heat exchanger which benefits from corrosion resistance technology which adds to the expected lifespan of the boiler and which actively counteracts dirt and sludge deposits.

This component has a 10-year warranty against corrosion and the whole boiler comes with a 5-year standard comprehensive warranty.

Viessmann B2KB Vitodens 200-W 26kw Boiler (82.71% HomeSage score)

The Vitodens 200 range all benefits from compatibility with the ViCare app.

You can operate your heating system from anywhere at the touch of a button on your smartphone. 

This boiler has a modern, functional design featuring a plain matt surface that will blend seamlessly with its surroundings.

It measures 850mm x 450mm x 360mm so slightly larger than other similar boilers on the market.

It comes with a number of different control options or you can opt for a constant temperature or weather-compensated controller as separate accessories. 

This boiler comes with a 5-year warranty providing it is fitted and maintained by a Viessmann approved installer.

Viessmann B1LD Vitodens 111-W 26kw Boiler (77.91% HomeSage score)

A recent addition to the Viessmann catalogue, the Viessmann B1LD Vitodens 111-W 26kw boiler has an improved, sturdy outer casing for maximum safety of the components.

It measures 900mm x 600mm x 480mm so it’s slightly bigger than usual boilers but this is because it is a storage combi boiler with an integrated stainless-steel storage tank of 46 litres.

This boiler has a back-lit LED control panel so you can always see what you’re doing even in a dark space and comes with the standard 5-year Viessmann warranty for your peace of mind. 

Viessmann B2TB Vitodens 222-F 19kw Boiler (75.48% HomeSage score)

Often used to replace floor-standing gas heaters, the Viessmann B2TB Vitodens 222-F 19kw boiler has an integral enamelled loading cylinder for a powerful output.

This boiler is perfect for people who want the convenience of a combi boiler with the security of constant, instant hot water.

It has been designed to correspond to standard kitchen unit dimensions and it measures 595mm x 600mm x 1425mm to fit in seamlessly with your cupboards and other modern appliances.

It has a white outer shell and an easy-use colour touch screen control panel.

As with the Viessmann B1KC Vitodens 100-W 26kw, it offers a 10-year warranty on the Inox-Radial heat exchanger and the standard 5-years on the boiler with parts and labour included.

Viessmann B2TB Vitodens 222-F 26kw Boiler (75.15% HomeSage score)

This is a condensing floor standing unit that offers high energy efficiency and modern, clean-cut design.

It has capacity to store 100 litres in the loading cylinder and it reduces your energy consumption by utilising the latent heat in the flue gases so the energy efficiency is always of a high level and your energy bills will be much lower. 

This boiler also benefits from the highly efficient MatriX-Plus burner.

Combining this with the Inox-Radial heat exchanger results in a reduction in harmful emissions with no compromise on power. 

The measurements of the B2TB Vitodens 222-F 26kw boiler are 1400mm x 600mm x 595mm and it even has alternative solutions for different degrees of water hardness depending on your locality.

Viessmann’s top 3 gas combi boilers (28-34kw)

Boilers with an output of between 28kW to 34kW suit medium-sized properties like semi-detached homes with up to 4 bedrooms and 15 radiators.

If you have a house with 1 to 3 bathrooms, you will likely require a 28-34kW boiler.

There are 3 gas combi boilers in this range and the top 3 as ranked by HomeSage are:

Viessmann B1KC Vitodens 100-W 30kw Boiler (79.01% HomeSage score)

Measuring 700mm x 400mm x 350mm, the Viessmann B1KC Vitodens 100-W 30kw is a solid choice if you are either adapting an existing system or replacing an older appliance due to its low installed height. 

This boiler benefits from a quiet operating system, compatibility with smart technology and ‘tado°’ thermostat, and it boasts an easy-use, touchscreen LED control panel. 

It is finished with the classic matt Viessmann white shell and it comes complete with a fully comprehensive 5-year warranty as standard.

You can choose to extend this to 10-years if your boiler is fitted by a Viessmann Trained Installer.

Viessmann BPJD Vitodens 050-W 29kw Boiler (77.89% HomeSage score)

The Viessmann BPJD Vitodens 050-W 29kw combines a reasonable price with a premium product.

It houses the patented Matrix cylinder burner alongside the Inox-Radial heat exchanger to provide powerful heat when you need it.

This boiler is compatible with the extensive range of Vitoden accessories so it is a popular choice for new builds or renovation projects because you can fit it in a range of spaces. 

It comes with a 3-year comprehensive warranty or you can increase it to 7-years if it is installed by a Viessmann Trained installer and registered through the Viessmann installer portal.

This boiler measures 707mm x 400mm x 350mm and weighs 36kg.

Viessmann B2KB Vitodens 200-W 30 Boiler (77.88% HomeSage score)

As with the other Vitodens 200-W models, the Viessmann B2KB Vitodens 200-W 30 can be controlled using smart technology and benefits from a full 7-inch colour touch screen control panel. 

This series has great efficiency, lower emissions, and it’s easy to use.

They are aimed to be ‘future-proof’ with their use of digital technology such as ViCare and are easy to install and maintain.

This boiler is made in Germany, comes with a warranty of up to 10-years if required and it measures 850mm x 450mm x 360mm.

Viessmann’s top 5 gas combi boilers (35kw+)

If you have a larger property, for example a semi-detached or detached home with 4 or more bedrooms, you will require a gas combi boiler of 35kW or higher.

To put it in perspective, a 42kW boiler will run approximately 20 radiators and supply hot water for 3 or more bathrooms.

Viessmann B1KC Vitodens 100-W 35kw Boiler (78.82% HomeSage score)

This is a traditional-looking, matte white boiler from Viessmann.

It benefits from improved installation options and straightforward access from the front of the system so there’s no need to leave space at the side for maintenance or repairs. 

It contains the highly efficient stainless-steel Inox-Radial heat exchanges which provides operational reliability, a long service life and a small environmental footprint. 

This boiler comes with the standard Viessmann 5-year warranty with option to extend to 10-year providing you always use a registered Viessmann Trained engineer to service or repair your system. 

It measures 700mm x 400mm x 350mm so is fairly standard in size but perhaps compact compared to other Viessmann boilers on the market. 

Viessmann B2KB Vitodens 200-W 35kw Boiler (78.22% HomeSage score)

The Viessmann B2KB Vitodens 200-W 35kW boiler is the next step up from the B2KB Vitodens 200-W 30kW so it includes all the same features alongside a higher output. 

With this boiler, you benefit from lower noise operation due to a low fan speed, a 7-inch full colour screen digital control display, and the option to integrate with your WiFi for smart control anywhere.

It measures 700mm x 360mm x 450mm and it conveniently has a moveable display for optimum eye-level comfort and ease of use.

Viessmann B1LD Vitodens 111-W 35kw Boiler (77.82% HomeSage score)

This boiler is perfect for those located in a low-pressure area. It provides the best of both worlds being a combi storage heater with a 46-litre capacity housed within a stainless-steel primary store.

It benefits from a controller with a built-in room temperature sensor which can be connected to an outdoor sensor which allows the boiler to run ‘weather compensation’ mode and further reduce the cost of your energy bills.

The Viessmann B1LD Vitodens 111-W 35kw measures 900mm x 600mm x 480mm which is slightly bigger than normal thanks to the increased storage capacity but it would fit well within standard-sized kitchen unit spaces as a standalone appliance if required. 

Viessmann BPJD Vitodens 050-W 35kw Boiler (77.79% HomeSage score)

This boiler has a height of 707mm and measures in at one of the most compact boilers of its ability and power.

The full dimensions are 707mm x 400mm x 350mm and it is finished in a matte white casing with a simple control panel. 

It comes with a 3-year warranty for the boiler and a 10-year warranty for the Inox-Radial heat exchanger.

It has a quiet operating system so you shouldn’t be disturbed by any noises whilst it’s heating your water.

It’s compatible with a large range of Viessmann accessories which make installation easy in new builds and home renovation projects alike. 

Viessmann B2TB Vitodens 222-F 35kw Boiler (74.49% HomeSage score)

Measuring 900mm x 600mm x 480mm, the Viessmann B2TB Vitodens 222-F 35kw has a large output to cope with significant work demands.

It comes with the standard 5-year warranty which can be increased if installed and serviced by a fully certified Viessmanns Trained Installer. 

This boiler has a 46-litre stainless steel storage facility and is ideal for areas that suffer from low water pressure. 

Save up to 54% on your new gas combi boiler

You can save up to 54% of the cost of the supply and the installation of your new boiler by leaving your details with us at any of the forms on this page.

We will contact three or four local, trusted and Gas Safe regulated engineers with your query who will get in touch with you for a free quote and relevant advice.

Our service is completely free for you and it is no obligation – there is no pressure to accept any of the offers from our partner installers if you decide not to go ahead. If you do, then great – you could save hundreds of pounds!

Still unsure of what type of boiler, from what manufacturer, is best for you? Why not check out our other post on the best boilers in 2021 or the HomeSage Advice Hub for more info!