An award winning German boiler. Viessmann's 100 model has won the hearts, minds and airing cupboards of Brits.
Back in 2018, we were outliers - early adopters of a German boiler, joyfully telling potential customers that it’s the best boiler they haven’t heard of.
Fast forward to 2024 and Viessmann no longer need our help. They’re a proven, award winning, highly rated boiler brand. We’re only taking a small amount of credit for their success.
Viessmann Vitodens 100-W Review
In this Viessmann Vitodens review, we've scored the 100-W in 4 key areas, including:
Reliability: 5 Stars
Performance: 5 Stars
Warranty: 5 Stars
Price: 4 Stars
The Viessmann is a high efficiency combi boiler that is designed to be wall-mounted. Available in multiple different power outputs it is suitable for a wide range of homes and its compact size makes it ideal for properties with limited space.
The features offered with the Vitodens 100-W rival a good deal of combi boilers on the market right now, if not all of them.
No likey words? Watch movie pictures of man talky boiler below.
Main features of the Viessmann 100-W:
Before we get into the details, here are some of the most notable features of the Viessmann Vitodens 100-W model (most recent 2021-2024 model):
Class 'A' for energy efficiency
10-year comprehensive warranty as standard - when purchased with Heatable
94% efficiency
Weather compensation option for Boiler Plus compliance
Backlit LCD touchscreen display
Stainless steel heat exchanger
Compatibility with the Viessmann Vitronic smart thermostat - that sounds fancy
Looking for a groundbreaking and STILL award-winning Viessmann boiler on a budget?! Check out the Viessmann Vitodens 050-W 29kW. *We love it.
Viessmann Vitodens 100: Reliability: 5/5
The Viessmann Vitodens 100-W is the best-selling combi boiler from the award-winning brand and has an impeccable reputation.
An inside take:
Heatable have been installing Viessmann boilers since 2018. If they gave us post-installation problems, we simply wouldn’t offer them.
We’ve found them to be as not, if not more reliable than Worcester-Bosch models. For balance, it should be noted that if called upon, Worcester-Bosch still lead the way in post installation customer service by some way.
Trustpilot Reviews
For illustration, on TrustPilot, Viessmann UK has racked up an incredible amount of reviews. As of 2024, almost 5000 customers left a review.
The brand has an average rating of 4.3 stars out of 5, incredible for a company that's still relatively new to the UK market.
Boilers are often subject to harsher reviews due to the distress when purchased.
Only Wim Hoff left a positive review after his shower went cold on him.
Which? Boiler Survey Results
Viessmann was previously awarded the Which? Best Buy Award from 2017 to 2024 and since their introduction to the UK market has made continued efforts to improve the availability of spare parts.
A short while back, engineers keen to fit competing boiler brands to max out their Nectar points used to enjoy telling customers that Viessmann parts were tough to come by.
This is no A) not true and B) super irrelevant to a brand spanking new boiler.
2024 is Viessmann’s world. We just live in it.
Performance: 5/5
Viessmann Vitodens Combi Boiler Power Outputs
The Viessmann Vitodens 100 combi boiler range is available in the following sizes (power outputs):
26kW
30kW
35kW
The 30kW combi boiler (most popular) has a heat output of 30kW and a flow rate of 12.3 l/min, making it suitable for average sized properties that may have slightly greater hot water demands.
The 100-W range is also available in various other power outputs with corresponding flow rates, ideal for properties with greater hot water demands.
The hot water flow rates range from 10.6 l/min up to 14.3 l/min, offering excellent pressure and capacity for any households that have a significant hot water demand.
Want to know which boiler power is right for your home? Check out our boiler sizing guide.
You can check the latest deals on Viessmann boilers here, and see how the brand compared to another market leader in our Worcester Bosch vs Vaillant Boilers comparison.
Efficiency of Vitodens 100-W
The Viessmann Vitodens 100-W is certified as A-rated for efficiency and offers 94% efficiency.
You can save even more energy and money by controlling the boiler with a smart thermostat.
This allows you to control your boiler from a convenient smartphone app, allowing you to set up schedules and gain access to a whole range of other energy-saving features.
The Vitodens 100 dimensions
The Viessmann Vitodens 100-W comes in a pretty compact size for a wall-mounted combi boiler (see dimensions below).
Its compact size will allow for fitting in most standard kitchen cupboards and not make it too much of an eyesore when fitted externally in a living space.
Live in a cupboard in London? No problem.
Dimensions | Size (mm) |
Height | 700 |
Width | 400 |
Depth | 350 |
Not just small - it's quiet too! The Viessmann Vitodens 100-W is the preferred boiler of 78% of monastery confined monks
Controls & Features of the Viessmann Vitodens 100-W
A unique and standout feature of the latest Vitodens 100 is the Lambda Pro technology, which was previously only available in the 200 range. This ensures the gas valve constantly adjusts to the air and gas mix it receives, making sure it maintains maximum efficiency and burn rate.
The latest Vitodens 100 also includes an updated LCD touchscreen display with integrated Wi-fi, allowing you to control, and diagnose the boiler and enable remote access to Viessmann support so that they can assist from afar and diagnose faults.
The touchscreen display also expands on the usual error code system and actually shows you which components have failed and may be causing the fault. This helps to alleviate the costs associated with diagnosing faults using a generic and broad error code.
Warranty: 5/5
The warranty is a major part of buying any new boiler as if something goes wrong you want the reassurance that it will be repaired and back in working order as soon as possible.
The great news is that when you purchase your Viessmann boiler with Heatable, you will receive a 10-year warranty.
We’ll even register it for you to save you the pain of opening a new browser tab.
Price Point: 4/5
Viessmann Vitodens Combi Boiler Costs
It's an award-winning boiler, from a world-leading brand with the latest features. That means it comes with a premium price tag.
The exact costs of the boiler (including Gas Safe installation) may vary depending on your type of property, hot water demands and a whole host of other facts.
So, to make it easy, we have designed a quick questionnaire that will give you an instant fixed price. It takes about 60 seconds to complete.
Viessmann Vitodens 100-W Deals
However, for illustrative purposes Viessmann boilers through Heatable start from £1,995 including fitting, naturally.
The Viessmann Vitodens 050 is their entry-level model. The 100-W has had a recent price drop, and you can now bag one from just £2,595 (with a massive 10-year warranty).
Monthly payment options are available on all boiler installations purchased with Heatable.
Viessmann Model | Price From | Get precise Quote |
Vitodens 050-W 29kW | £1,995 | |
Vitodens 050-W 35kW | £2,150 | |
Vitodens 100-W 26kW | £2,250 | |
Vitodens 100-W 30kW | £2,595 | |
Vitodens 100-W 35kW | £2,695 | |
Vitodens 200-W 35kW | *not stocked (niche) | |
*not stocked (niche) | ||
Vitodens 111-W 35kW | *not stocked (niche) |
Having claimed themselves a Which? Best Buy award, the Viessmann Vitodens 100-W (and its feisty little brother the Vitodens 050-W) offer outstanding value for money against their rivals, especially when considering their superior internal components for a longer lasting boiler.
Below is how Viessmann measure up for price against Which? Best Buy regulars.
Boiler MakeAvg PricePrice vs UK Avg | ||
Worcester Bosch | £2,889 | + 5% |
Vaillant | £2,924 | + 2% |
Viessmann | £2,390 | - 4% |
100-W. But what does the W stand for? We don't know. We're not sure anybody knows. Scholars maintain it was lost in translation hundreds of years ago.
Our Viessmann Vitodens 100-W Verdict
The Viessmann Vitodens 100-W review won't fight for your attention. He's no show-off. He'll blend into the background, quietly confident that if you get to know him, he'll prove himself - and he will.
He's the type of boiler that'll pick you up from the airport at anti-social hours, give change to the homeless and put misplaced bird eggs back in their nest. The Viessmann Vitodens 100-W is loyal and dead set on saving you money, like a Labrador doing your accounts.
So with stats to topple the competition and a price point to better them, our answer would be - why on earth wouldn't you?
Read our Worcester Bosch vs Viessmann Boilers review if you want a quick comparison of these two trusted boiler manufacturers.
Viessmann Vitodens 100-W Review Conclusion
How to grab a great price on a Viessmann:
Or, grab your own quote.
We’ve installed thousands upon thousands of Viessmann boilers, all over the UK.
We can often fit as quickly as tomorrow, with trusted, vetted local engineers delivering a 10-year product warranty.
Heatable have our 10,000 Trust Pilot reviews and offer monthly payments on all boiler installations.
