Viessmann Vitodens 100-W Boiler Review, Costs & Prices for 2024

The Viessmann Vitodens 100-w is arguably one of the best boilers on the market right now. As Viessmann’s best-seller, it combines German engineering, premium features, reliability, and ease of use, making it a hit among UK homeowners.

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To illustrate why, we’ll take an in-depth look at this wall-mounted gas condensing boiler, available as a system and combi. We’ll discuss its features, pros and cons, price, and more to help you decide whether it’s the right fit for you.

Viessmann Vitodens 100-W Boiler Review – Quick Summary

• SEDBUK 2009 seasonal efficiency of 89.5%
• Ideal as a replacement for older appliances due to its compact size that can be easily adapted to existing systems
• Low operating noise through extended modulation ratio of up to 1:10
• Modulating stainless steel cylinder burner
• User-friendly control via backlit LCD touchscreen (compatible with Viessman boiler & room thermostats)
• Straightforward access from the front, so no need to leave space at the side for maintenance
• Approved for multiple connections to stacks in multi-story buildings
• Combined PRV and condensate connection for fast and simple installation
• 10-year warranty, with the option to extend it to 12 years

Is the Viessmann Vitodens 100-W Boiler Any Good?

Yes, the Viessmann Vitodens 100-W is better than just good. With a Which? Best Buy award, a super easy-to-use backlit control panel, and long warranties, it’s easy to see why this heating system is considered one of the best combi boilers in the UK market today. Viessmann has named it their best-selling gas condensing boiler.

This highly engineered boiler offers a super-quiet operation. It’s also smart tech-ready, designed to help you optimise and save energy at a minimal cost.

With an impressive 94% energy efficiency rating, it’s one of the most energy-efficient gas condensing boilers and a popular choice for UK homes. And thanks to its advanced technology, it can modulate down to a 1:10 ratio.

The Vitodens 100-W boiler is available in two options: a gas-condensing system boiler and a gas-condensing combi boiler.

The system boiler requires an external hot water cylinder while the combi boiler has a built in integral plate heat exchanger. Both types ensure constant hot water temperature. 

Key Specifications

Type	Natural Gas Combi Boiler
Colour	White
Warranty (Years)	12 (only with Boiler Central)
Width (mm)	400
Height (mm)	700
Depth (mm)	350
Weight (kg)	38
Output (kW)	3.2 to 25
ErP Space Heating Efficiency	A
Flow Rate (l/min)	10 -17
Mounting	Wall

Verdict? If you’re looking for a powerful, reliable, and energy-efficient heating solution, the Viessmann 100-W boiler is an excellent choice.

In case any Viessmann Vitodens 100 boiler problems occur they come with a manual. You can also google any issues or ring for a Gas Safe engineer who will be included within your warranty.

If you like the thought of the high amount of water a system boiler can produce but don’t like the thought of a hot water tank, why not consider the Vitodens 111-w storage combi boiler with a built in tank? You get all the benefits of a system boiler in one single unit.

Viessmann Vitodens 100-W Dimensions and Size

One of the best things about the Viessmann Vitodens 100-W is that it’s compact. Its sleek design allows it to fit seamlessly into your cupboard space.

Dimensions	(mm)
Width	400
Height	700
Depth	360

Viessmann Vitodens 100-W Boiler: Top Features

An Easy-to-Use Touchscreen Panel

The Vitodens 100-W wall-mounted gas condensing boilers are all equipped with a new, easy-to-use LCD touchscreen. This makes it easy to access options and settings, especially in the dark.

Because of the new Viessmann One Base platform, the Vitodens now comes with a built-in WiFi interface and can be easily managed via the ViCare app. You can choose a wireless remote control for even easier access to the system.

A Superb 4-Pipe System

You have the option to install the Vitodens 100-W system boiler with a Vitocell 200 or 300 unvented cylinder. When paired together, this complies with G3 building regulations. This setup eliminates the need for an energy cut-off valve and a cylinder overheat thermostat to be integrated into the system.

Versatile Hydraulic System

The Viessmann Vitodens 100-W is designed for flexibility with its four hydraulic connections: two for heating flow and return and two for either a hot water cylinder (system boiler setup) or direct domestic hot water (DHW) heating (combi boiler setup).

These are only intended for installation in sealed, unvented heating systems. Boilers for unvented heating systems are also available. For S plan or Y plan systems, the two internal connections must be capped off during installation.

The main components of the hydraulic system include:

•  Circulation pump
•  3-way diverter valve
•  Safety valve
•  Diaphragm expansion vessel
• Plate heat exchanger for DHW heating (gas condensing combi boiler)

Weather-Compensated Mode

To enhance its efficiency and lower your energy bills, the boiler can be operated in weather-compensated mode by connecting an outside temperature sensor (included in the accessories) that’ll monitor outdoor temperatures. So, when it gets colder outside, the Vitodens 100-W will increase its output to maintain your desired indoor temperature, and vice versa; when it gets warmer outside, it will lower its output.

Great Warranty

Viessmann offers a standard 10-year warranty that can be extended for up to 12 years. If you buy a Viessmann 100-W from Boiler Central, you get a market-leading 12-year warranty. 

If anything goes wrong, you can fix the unit for free with their parts and labour guarantee.

If you have any issues with your Viessmann Vitodens unit, you can call a Gas Safe engineer who will be included within your warranty.

How Much Does a Viessmann Vi

How Much Does a Viessmann Vitodens 100-W Cost? 

The average cost of the Vitodens 100-W boiler with installation is around £1800, depending on your location in the UK. The cost of a new combi boiler or system boiler in this range is slightly higher than most comparable models from other manufacturers. But what you get for your money is outstanding value.

Keep in mind that additional factors, like relocating the boiler flue or moving the boiler to another room, can increase the total costs of installing a new boiler.

If you want a fixed-price quote on a Vitodens 100-w, you can get one online now with Boiler Central, and it will include the full installation.

If you’re unsure about the right boiler size for your home, you can use Boiler Central’s tool to get a fixed price for the most suitable heating solution for you.

All the prices below are just for the standalone boiler and do not include gas-safe installation by a heating engineer.

Viessmann Vitodens 100-w 26kw combi boiler	£950
Viessmann Vitodens 100-w 30kw combi boiler	£1,055
Viessmann Vitodens 100-w 35kw combi boiler	£1,150
Viessmann Vitodens 100-w 19kw system boiler	£1,025
Viessmann Vitodens 100-w 25kw system boiler	£1,055
Viessmann Vitodens 100-w 32kw system boiler	£1,200

Price up a Viessmann 100 combi or system boiler in just 20 seconds – click here

Viessmann Vitodens 100-W key boiler information:

A highly engineered and affordable boiler system with a super-quiet operation, the Viessmann Vitodens 100-W is the premier system for anyone who needs a new boiler. 

This energy efficient gas condensing boiler is an incredibly popular solution for UK homes. It now comes with hydrogen-ready capabilities to 20% which means it can run on a blend of natural gas and hydrogen to cut greenhouse gasses. Fantastic for reducing your carbon footprint.

With innovative technology, highly efficient service and reliability, and smart tech-ready, the Vitodens 100-W will help you to optimise and save energy.

Pros And Cons Of The Viessmann 100w Boiler 

Here’s a list of pros and cons to help you understand its strengths and potential drawbacks:

Pros 

• High efficiency: Up to 94% of fuel converted to heat (Class A rated)
• Compact design: Fits in small spaces and requires no side clearance
• Smart features: Built-in WiFi and compatibility with ViCare app
• Versatile: Available as both system and combi boiler
• User-friendly interface: LCD screen with 7-segment display and touch buttons
• Long warranty: 10-year standard warranty, extendable up to 12 years

Cons

• Requires professional installation: Not a DIY project
• Initial learning curve: Users may need time to familiarize themselves with the smart features

Viessmann Vitodens 100-W Combi Models

The Vitodens 100-W combi boiler range is available in three models with different outputs, offering efficient heating solutions for various home sizes.

• Viessmann Vitodens 100-w 30kw
• Viessmann Vitodens 100-w 35kw
• Viessmann Vitodens 100-w 26kw 

The Vitodens 100-w 26kw combi boiler is designed for small homes with one bathroom, the 30kw combi boiler is ideal for small to medium homes with one or two bathrooms, whereas the 35kw is the most powerful in this series, suitable for homes with 3+ bathrooms. 

The 30w is the most popular in the range, but the 35kw provides better value for money compared to similar high-output combi boilers, such as the Worcester 8000, making it a competitive option in its class.

Viessmann 100-W System Boiler Models

System boilers are different from conventional boilers in that they don’t require a tank—they use a sealed storage cylinder—so they’re more compact.

This translates into great hot water capacity, which allows you to use multiple taps or showers without any reduction in the water pressure in your home. 

The Viessmann Vitodens 100-W system boilers are available in four different outputs:

• Viessmann Vitodens 100-w 11kw
• Viessmann Vitodens 100-w 19kw
• Viessmann Vitodens 100-w 25kw
• Viessmann Vitodens 100-w 32 kw

The output you need depends on the hot water demand in your home. The 32kw is the most powerful, while the 11kw is the least. Still, the 11kw is a super-economical boiler (with a great warranty!) for everyday use. Check out our guide if you need help determining what size boiler you will need for your home.

Why Choose the Viessmann Vitodens 100-W Boiler?

Viessmann Vitodens 100-W Review: Heat Exchanger

As with all Viessmann gas condensing boilers, the Vitodens 100-W is equipped with stainless steel Inox-Radial heat exchangers.

Quite simply, this means that the stainless steel heat exchanger will prolong the boiler’s lifespan, outperforming competitors like Worcester Bosch as they use aluminium heat exchangers, which are prone to wear and breakages.

This technology has an extremely high efficiency rate of 98% and exceptionally reliable and efficient operation during its long service life. 

Viessmann offers a 10-year guarantee against corrosion-related leaks and Boiler Central offers a unique 12 year warranty on all newly-installed Viessmann boilers!

Buy a Viessmann Vitodens 100-w Boiler Online Today

As we wrap up this review, one thing is clear—the Viessmann Vitodens 100-W is an energy-efficient boiler that’s built to last. While it might cost a bit more upfront, it’s a smart investment that promises lower energy bills and reliable performance, so we say it’s certainly worth it.

We have a range of guides if you need help choosing the type of boiler that’s most suitable for your home.

We will analyse your number of bedrooms and bathrooms and provide you with a 100% reliable quote where you can book online and select an installation time that suits you.

All installations come with Boiler Central’s 12-year warranty on all Viessmann boilers and exemplary service, including the Viessmann Vitodens 100-w.

Our flexible boiler finance options make buying a boiler online quick and easy.

FAQs

Where are the Vitodens 100-W Boilers Made?

Viessmann boilers are manufactured in Germany, so you can be sure you are getting the best in precision engineering. 

Being one of the best and most reliable boiler manufacturers doesn’t come easy in a crowded market. Yet, Viessmann were able to leverage their experience and design know-how to build this remarkable product while keeping their pricing competitive in the market.

What type of boiler is a Viessmann Vitodens 100-W?

The Viessmann Vitodens 100-W is a wall-mounted gas condensing boiler that comes as a system boiler or combi boiler. It operates quietly thanks to the MatriX-Plus burner, and it’s built to last due to its high-quality materials, like the stainless steel Inox-Radial heat exchanger.

How long do Viessmann boilers last?

Viessmann boilers can last over 15 years if regularly serviced. For the Vitodens 100-W, Viessmann offers a 10-year standard warranty that you can extend to up to 12 years.

Why are Viessmann boilers so expensive?

Viessmann boilers are more expensive than some competitors because of their high-quality German design and engineering, innovative technology, and long warranty. That said, they do offer better value for money, as you’ll get a reliable, energy-efficient, and feature-packed unit with a long lifespan. 

Is there a Vitodens boiler with a built-in tank?

Yes, the Vitodens 111-w storage combi boiler is a great boiler with a built-in tank. It offers all the benefits of a system boiler in one single unit.

Is Vitodens 100-W better than the Worcester-Bosch Greenstar series?

The Viessmann Vitodens 100-W is a better and more efficient choice than the Worcester-Bosch Greenstar series. Unlike the Greenstar, it can be operated in weather-compensated mode, uses a stainless steel heat exchanger, and has a higher SEDBUK 2009 seasonal efficiency of 89.5%.

It’s also an upgrade on the Viessmann 050-W, with much better internal components. For more information, see our Viessmann Vitodens 050-W review.