Viessmann Boiler Reviews and Boilers Buying Guide (2022)

If you’re in the market for a new boiler, there’s a good chance you’re getting overwhelmed by the options. In this post, we’ll talk about Viessmann, one of the top boiler manufacturers in 2022. We’ll discuss Viessmann boiler reviews, prices, installation costs, warranties, and alternatives. 

Ready to find out if a new boiler from Viessmann is right for you?

Viessmann boiler reviews

Viessmann Boiler Consumer Reviews

Here’s the problem with Viessmann reviews — there are hardly available.

Besides opinions offered by heating engineers, the reviews are really limited to the annual Which? Best Boiler Brands survey. This survey reaches out to around 10,000 property owners and just over 200 boiler engineers each year, asking them what they think of the 11 best boiler brands (depending on the brand they own/install).

Here’s what the most recent review by Which? uncovered:

  • Viessman Boilers got an overall review rating of 84% based on reliability, customers overall scores, and engineer’s opinions
  • They were named the “Most Reliable Boiler” brand
  • Received 5 stars for “Reliability” and “Customer Satisfaction”
  • Over 66% of Viessmann owners would recommend the brand to a friend

As you can see, Viessmann boilers are generally held in high regard (you can read some Viessmann reviews yourself on Trustpilot here).

Viessmann Boiler Key Features

Whilst all boiler makers strive to pack their products full of features — some useful, others confusing — Viessmann has loaded their flagship Which? Best Buy Viessmann Vitodens range with various handy settings and controls.

Let’s have a look below, using the Viessmann Vitodens 100-W gas condensing boiler as an example.

ViCare Thermostat

With every Viessmann Vitodens 100-W, you may opt to use the company’s proprietary, ViCare Thermostat. This means you needn’t worry about a third-party thermostat miscommunicating with the boiler for whatever reason.

What’s more, the ViCare thermostat shows you the boiler’s operational status and allows you to control the boiler from a smartphone. And if your boiler ever malfunctions, this thermostat allows a Gas Safe heating engineer to have remote access to your boiler, meaning they can run some diagnostics without an in-person visit.

LED Touch Screen

Viessmann’s LED touch screen aims to make accessible a rather complex piece of equipment. Despite the sophisitcated mechanism that gives these boilers their efficiency and reliability, the settings are surprisingly easy to navigate, with a single, large, intuitive touch screen and black-and-white display.

High Enegy Efficiency

All modern, gas condensing boilers are highly efficient, delivering around 90% fuel efficiency.

Viessmann get you up to 94% efficiency with their Vitodens 100-W, provided that the boiler operates in condensing mode. This translates to substantial fuel savings and a reduction in your energy bills.

Stainless Steel Heat Exchanger

A heat exchanger is one of the most expensive boiler components, so you’ll be happy to know that Viessmann have equipped their gas boilers with high-quality, stainless steel heat exchangers that are meant to last long. Just how long, you wonder?

Well, considering Viessmann’s 10-year heat exchanger guarantee, we can surmise that they should last at least a decade. Not too bad, for a component that’s constantly exposed to heat and pressure.

Lambda Pro Combustion Control

This unique feature allows a Viessmann gas boiler to adjust operation automatically depending on which gas it’s being supplied. Whether you’re switching between different types of natural gas, or between natural gas and LPG, the Lambda Pro Combustion control handles the change for you.

Viessmann Boiler Prices

When you have a look around at the different brands offering boilers, whether that’s an oil combi, or a regular LPG, you’ll find the price differential is high.

I worked at a plumbing merchant for two years, so I know Viessman prices are up there with the premium brands. It’s German engineering that you’re actually bringing home, so it makes sense.

And when I say “premium,” I mean brands like Worcester Bosch, Vaillant, Baxi, and Potterton.

BUT, if you’re on the fence between getting a new boiler from Viessmann vs Worcester Bosch, there’s another thing to consider.

Heatable are an online boiler installation platform, and they supply and fit Viessmann combi boilers at incredibly low prices.


Using Heatable, you can get a fixed boiler price online within 90 seconds, with no need to input any personal details.

Then, compare that with prices you’re being quoted from local installers.

Or, compare them with the Worcester Bosch prices, which are often lower with Heatable.

Worcester Bosch Greenstar 4000

Viessmann Boilers Prices Versus Reliability

Reliability is something many people forget to consider. A boiler’s warranty only lasts so long, and once you’re out of warranty, the repair costs start piling up — and they’re rarely cheap. To get an idea, you can read our quick guide to boiler repair costs here.

According to the Which? survey, a reliable boiler, such as a Viessmann Vitodens, could save you around £233 in repair bills over a 6-year time frame compared to less reliable boiler.

Viessmann prices are higher than most, but only by a few hundred pounds. So, the savings you get on repairs will offset the slightly higher initial investement.

Viessmann Boiler Installation Prices

When it comes to boilers, prices are one thing but installation costs are another.

Viessmann boiler prices including installation are similar to the likes of Vaillant, Baxi, and Worcester.

Even if you own a small property, Viessmann combi boiler prices — including installation — should be around £2,400 with a local installer. That’ll get you something basic like a 24kW combi.

Remember though, if you’re installing a large kW boiler, or an oil boiler, this installation price will jump considerably.

You could save a bit by getting your Viessmann boiler through Heatable, which fit them at incredible prices that include a 10-year warranty.

Boiler Models & Warranty from Viessmann

Before we delve into the Viessmann range, or engage in any Viessmann vs Worcester Bosch comparisons, we need to talk about warranty.

Viessmann Boiler Reviews UK

If you’re not an engineer, this is the one thing to which you should pay close attention.

The warranty a manufacturer offers on their boilers gives a clear indication of what they think about the quality of their own product. Each boiler manufacturer, including Viessmann, will have low, mid and high range boilers. You’ll notice that higher-end models typically come with longer warranties — that’s because the manufacturer believes there’s less risk of the boiler breaking down during the coverage period.

How Much Warranty Do You Need For Your Boiler?

If you go and check out a lot of the low-quality brands, you’ll see warranties of 1-2 years. Admittedly, some quality brands offer 2 years on their low-end products, but have warranty extension packages and higher-end boilers with 5-10 years.

Let me tell you right now – a 1-2 year warranty is not enough by any stretch of the imagination.

If I was replacing my boiler tomorrow, I’d want 5 years as an absolute minimum.

Which Viessmann Boilers Have the Longest Warranty?

Here’s a chart showing Viessmann warranties that cover the Vitodens combi boilers range. Don’t forget that each of these models have a heat exchanger that’s also covered by a 10-year guarantee.

ModelStandard warrantyExtended (when installed by Heatable)
Vitodens 050-W3-year warranty10-year warranty
Vitodens 100-W5-year warranty10-year warranty
Vitodens 111-W5-year warranty10-year warranty
Vitodens 200-W/222-F3-year warranty10-year warranty
Vitodens 242-F2-year warranty10-year warranty

The Best Viessmann Combi Boiler Range

Viessmann Vitodens boilers

We’re happy with most models in the range, but think the best combi boilers are:

All of the above are Which? Best Buy boilers. There are plenty of warranty extension options there, but you’ll need to make sure the installation is completed by a Viessmann-trained engineer like Heatable and bank a 10-year warranty on your boiler install.

The general rule of thumb is if you do choose to buy a Viessmann boiler, make sure it’s installed by someone that’s had official training by the Viessmann brand.

Viessmann Vitodens 100 W1What Size Viessmann Boiler Do You Need?

Viessmann boilers are designed for a range of fuel options (LPG, Gas, Oil), heating systems (combi, regular, or system boiler), but also properties of different sizes.

You’ll need to have a Gas Safe engineer spec your property and central heating system.

They’ll take into account the length of the heating run as well as the amount and size of radiators to determine which Viessmann model to install.

Buying a Boiler That’s Too Big

This isn’t a huge issue, apart from the fact that the boiler itself is going to cost much more than a smaller one. So, you’ll have spent money that you didn’t need to.

Buying a Boiler That’s Too Small

This is a huge issue.

If you buy a Viessmann boiler that’s too small, you’re going to have all sorts of problems, including:

  • Radiators not getting hot
  • Shower and tap water not getting up to temperature
  • Boiler enduring excess strain, leading to premature breakdowns and expensive repair bills

So, make sure your boiler is chosen correctly by a Gas Safe engineer.

Before You Buy — Compare Viessmann vs Worcester Bosch Boilers

There’s definitely nothing wrong with Viessmann boilers; they are actually the largest boiler manufacturer in Europe. But before investing several thousand pounds into a new appliance, it only makes sense to compare your chosen boiler brand against top-shelf competitors.

In the case of Viessmann, the closest competitor is none other than UK’s very own Worcester Bosch.

Viessmann boilers vs Worcester boilers

The truth, though, is that both Viessmann are Worcester boilers are excellent. Viessmann boast German engineering, stainless steel heat exchangers, and high-quality parts.

Worcester are pretty well the UK equivalent. Regardless of which brand you choose, you’ll get energy efficiency, long-lasting components, straightforward controls, and a helpful customer service team.

So, instead of basing your decision solely on the brand, consider the following factors as you consider various boiler brands and models:

  • Do you use a fuel type other than gas? If so, you may need a wall-hung or external oil boiler.
  • Would you want a compact boiler that fits in a small cupboard (kitchen for instance)?
  • Do you have high hot water and heating demand in comparison to similar properties?

Combined, these factors might mean that there’s a perfect boiler on offer from an alternative brand.

How to Pay for Your Viessmann Boiler

If you have cash upfront for your boiler replacement, great.

But not everyone does; after all, nobody really plans to replace their boiler.

Also, not too many of us have £2,000 in our piggy bank to spare.

So, you can get quotes for boiler replacement paid on completion of the installation, or you can go down the boiler finance route.

There are multiple UK companies now offering finance packages for Viessmann boilers, and some even offer 0% interest.

And, you can get quotes from multiple Viessmann boiler installers, for both upfront payment and finance.

But for Viessmann, you’ll probably get the best prices from Heatable.

You can use Heatable’s online calculator to get fixed price boiler quotes by filling out a few basic details about your property.

Cheap combi boilers

Viessmann Boiler FAQs

As we wrap up, let’s go through some common questions surrounding Viessmann boilers.

Are Viessmann boilers better than Vaillant?

Both Viessmann and Vaillant manufacture quality, reliable boilers, but Viessmann boilers are significantly less expensive. Since they offer similar quality for a lower price, Viessmann boilers arguably offer better value for the money.

How much is a Viessmann gas boiler?

Without installation, Viessmann boilers typically raange between £800 and £1,900, depending on the model. Including installation, this figure is closer to £2,400-£3,000 if you’re using local installers.

However, you may be able to get a better deal with an online installation company like Heatable; you can fill out their questionnaire to get a quote online.

How efficient are Viessmann boilers?

Viessmann manufacture some of the mosts efficient boilers on the market. Some of their modern, condensing gas boilers have an efficiency of up to 98%. This means that for every pound you spend on gas, only 2p get wasted.

How long are Viessmann boilers guaranteed for?

Most boiler models from Viessmann come with a parts and labour warranty that ranges between 2 and 5 years. That said, you can get an extended warranty depending on whom you choose as the installer. For example, you’ll get a 10-year warranty if you get your Viessmann fitted through Heatable.

Who makes Viessmann boilers?

Viessmann Group, a company specialising in heating, cooling, and refrigeration systems, is the manufacturer of Viessmann boilers. Though it started in Germany, Viessmann have since expanded to several nations worldwide, including the UK.

What’s Next?

Thanks for reading our 5-minute guide to Viessmann boilers. Hopefully, this review has helped you understand whether a Viessmann is right for you, and what you need to do next.

Is there anything we’ve missed here? Still got questions about having a new Viessmann fitted?

Leave a comment below and I’ll get back to you as soon as possible.

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