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

James Elston
Written by James Elston
Updated on 2nd January 2024
Posted on 1st January 2024
Viessmann Vitodens 100-W Boiler Review, Costs & Prices for 2023

Viessmann Vitodens 100-W Boiler Review: Is the Vitodens 100 any good?

** Update New Model Hydrogen Ready to 20% Blend **

The Viessmann Vitdoens 100-w is arguably one of the best boilers on the market right now. This model is stated by Viessmann themselves as their best seller, and with top features at a great price as well as German build and reliability, it’s no wonder the Vitodens 100-w is a hit for homes in the UK.

Get a fixed price online in 20 seconds

Running at 94% energy efficiency, the Vitodens 100-w boiler range is up there with the most energy efficient. it no is also able to modulate down to a ratio of 1:10 due to the much improved technology inside this premium boiler.

If you buy a Viessmann 100-W boiler from Boiler Central, you get a 12-year warranty. Free parts, labour & call-outs!

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?
Viessmann Vitodens 100-W Review

If your looking for a powerful boiler with reliability and energy efficiency then the Vitodens 100-W is the ideal candidate, and if you add on top of this the new features and technology including being a hydrogen-ready boiler to 20% with built-in WiFi, then this boiler is set to be a hit for years to come.

Ahead of the game, Viessmann is appealing to the people falling into the ‘gas boilers are going to be banned‘ trap as it’s boilers that only run on gas are likely to be phased out, but boilers that can run with a blend of hydrogen (h2) in the gas supply will be being installed for years to come.

Video: Viessmann Vitodens 100-W Review

The Viessmann Vitodens 100-w boiler is avaiblabe in both combi boiler and system boiler types. This powerful combi boiler is not only reliable but super compact too for what it can do. This boiler comes with a market-leading 12-year warranty so you can be sure it will be built to last. And if anything does actually go wrong, you can get it fixed for free with their parts and labour guarantee.

The new Viessmann Vitodens 100-W Overview

Let’s now go to review the Viessmann Vitodens 100 boiler. The Vitodens 100 comes in the 3 main boiler types, a combi boiler, a system boiler, and a regular boiler. They come in varying outputs so that they’re suitable for as many homes as possible in the UK.

Viessmann Vitodens 100-W Review

Viessmann named this boiler their best-selling gas condensing boiler.

The Viessmann Vitodens 100W boiler is one of the best combi boiler options on the market.

Having Which? Best Buy accreditation, a super easy-to-use backlit control panel and long guarantees, it’s certainly one of the leading boilers in the UK boiler market today.

Many people ask us:

Viessmann Vitodens 100-W Review

Is the Viessmann 100-W combi or system boiler any good?

Well If you’re looking for a new boiler, they are amongst the best for affordability and are especially reliable in our experience, earning them a Which? Best buy award.

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.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Viessmann Vitodens 100-W Boiler Price Review

The Vitodens 100-w is a mid-range premium boiler, so the cost of a new combi boiler or system boiler in this range is slightly higher than most. But what you get for your money is an outstanding value. No other manufacturer can give you this much boiler at such a low cost.

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

Always remember new boiler installation fees may not be included in the price. If you want a fixed price quote on a Vitodens 100-w then you can get one online now with Boiler Central that will include full installation.

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

Viessmann Vitodens 100-W key boiler information:

Viessmann Vitodens 100-W Review

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.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Viessmann Vitodens 100-W boiler: Top Features

An easy to use Touchscreen Panel:

Viessmann Vitodens 100-W Review

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.

You can also offer a wireless remote control for even easier access to the system. The new Vitodens 100-W comes with built in Wifi.

Viessmann Vitodens 100-W Dimensions and Size

The Viessmann Vitodens 100-W review also includes its compact dimensions thanks to German planning with fantastic compact sizing, making the system fit into any home decor and easy to place into cupboard space.

With its sleek design, it will fit into any type of home and be your heating powerhouse for many years to come.


Where are the Vitodens 100-W made?

Manufactured in Germany, you can be sure you are getting the best in precision engineering. Being one of the best and most reliable manufacturers of boilers doesn’t come easy in a crowded market.

Still, with Viessmann’s experience and know-how, they managed to design and build a remarkable product.

They manage to do this and keep their pricing below others in the boiler installation market but offer the highest reliability on the market.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Why choose the Viessmann Vitodens 100-W boiler?

Vitodens 100-W Review
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 last for donkey’s years, which rivals competitors like Worcester Bosch as they use aluminium heat exchangers which are prone to wear and breakages.

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

Viessmann guarantees the Inox-Radial heat exchanger for ten years against leaks resulting from corrosion and Boiler Central offers a unique 12 Year warranty on all installed Viessmann new Boilers!

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Viessmann’s superb 4-pipe system boiler:

Viessmann Vitodens 100-W system boiler is a gas condensing boiler made to be wall-mounted.

Viessmann Vitodens 100-W 30kW is very popular, but it is also available as 26kW and 35kW.

Most noteworthy is that Viessmann Vitodens 100 system boilers go up to 35kW. If installed together with a Vitocell 200 or 300 unvented cylinder, they become the perfect system boiler combo when adhering to G3 building regulations.

Viessmann Vitodens 100-W 4-pipe system

This stops the need for an energy cut-off valve and a cylinder overheat thermostat, being integrated into the boiler. 

The Viessmann Vitodens 100 system boilers include a Viessmann weather compensation outdoor sensor installation. The sensor enables the boiler to connect with the outside weather so it can detect if the boiler needs to increase or decrease the temperature.

Viessmann Vitodens 100-W – Quick Review

  • SEDBUK 2009 seasonal efficiency 89.5%
  • Ideal as a replacement for older appliances due to low installed height and installation space for adaptation to existing systems
  • Low operating noise through extended modulation ratio: up to 1:6
  • Modulating stainless steel cylinder burner
  • User-friendly control via backlit LCD touchscreen (option for control via Viessman boiler & room thermostats)
  • Straightforward access from the front, so no need to leave space at the side for maintenance
  • Also approved for multiple connections to stacks in multi-storey buildings
  • Combined PRV and condensate connection, for fast and simple installation

For affordability (Viessmann Boilers start at £1,695 installed!), reliability, ease of use and space-saving, the Viessmann range is going to be the best choice on the market in affordable boilers.

Don’t just take our word for it either. The Vitodens 100-W is a which? Best buy, and for a good reason.

Not convinced? Let’s explore further specs! 

Viessmann Vitodens 100-W Review
Viessmann Vitodens 100-W

Viessmann Vitodens 100-w 30kw combi review

The Viessmann Vitodens 100-w 30kw combi boiler is the ideal boiler for small to medium homes with 1 or 2 bathrooms.

30kw is one of the most popular outputs in the UK as like the Vitodens 100 30kw, it is able to cope with reasonable hot water demand, whilst not being too big to be using too much unnecessary energy.

The Viotodens 100-w 30kw is the most popular boiler in the range. Take a quick look at our the 30kw specification

TypeNatural Gas Combi Boiler
Warranty (Years)12 (only with Boiler Central)
Width (mm)400
Height (mm)700
Depth (mm)350
Weight (kg)38
Output (kW)30
ErP Space Heating EfficiencyA
Flow Rate (l/min)12

Viessmann Viotdens 100-w 35kw combi review

If you are looking for a more powerful combi boiler that can keep a larger home arm then the Viessmann Vitodens 100-w 35kw combi boiler is a perfect choice.

It is powerful, efficient, and reliable. It also comes in at a great price considering how well it performs and how reliable it actually is. We massively prefer this boiler in terms of value for money over the Worcester 8000.

Viessmann Vitodens 100-w 26kw combi review

The baby of this boiler range is the Viessmann Vitodens 100-w 26kw combi boiler. This combi bis perfect for smaller homes but want a reliable boiler with a big warranty.

The 26kw 100-w is a great option if you think that you need a powerful boiler every now and then but need a super-economical boiler the rest of the time. Do not get the Vitodens 100-w26kw if you have more than one bathroom as it will not provide 2 outlets at the same time with hot water well at all.

About Viessmann: Manufacturer Information

Viessmann is a German heating engineering company that aims to provide energy-efficient heating and minimal cost. The Vitodens range is their excellent attempt at doing this. The brand new Vitodens 100 has increased in technology whilst the price has remained the same.

The Vitodens 100-W is available as a gas condensing system boiler for the connection of one DHW cylinder and as a gas condensing combi boiler with an integral plate heat exchanger for DHW heating. 

In the delivered condition, the Vitodens 100-W is set up for operation with a constant boiler water temperature.

By connecting an outside temperature sensor (accessories), the boiler can be operated in weather compensated mode.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?


The following are integrated in the Vitodens 100-w:

One sealed unvented hydraulic system with 2 connections for heating flow and return, and 2 connections for cylinder heating (gas condensing system boiler) or DHW heating (gas condensing combi boiler). 

These boilers are only intended for installation in sealed unvented heating systems. Likewise, boilers for unvented heating systems are also available.

Additionally, if the Viessmann Vitodens 100-W combi boiler is installed in an S plan or Y plan system, then the two internal connections are not used and must be capped off during installation. 

Market-leading hydraulic systems

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

The Viessmann Vitodens 100-W is a better and more efficient choice than the Worcester-Bosch Greenstar series.

It is also an upgrade on the Viessmann 050-W boiler, with much better internal components. See our Viessmann Vitodens 050-W review for more information.

What about the cost with higher kW boilers?

Finally, in our experience customers ask us several questions regarding boilers and the heating costs but one that always pops up is: will a higher kW boiler cost me more to run?

It seems like an obvious answer, but actually, the answer is no.

You will heat your home faster with a larger kW boiler with a higher output and then enter simmer mode to keep the water hot.

The smaller boilers will stay firing high for longer to ensure correct radiator temperature to give you the optimum temperature for your home, making them use more gas. 

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

How much does a Viessmann Vitodens 100-W Cost?

The Vitodens 100-W is priced slightly higher than most of the comparable models from other manufacturers, coming in at an average of £1,879 dependent on your location in the UK.

Other factors will cost you more for your 100-W combi boiler, such as if you need to move your boiler flue or if you need to relocate your boiler to another room.

One thing that people are unsure of is what size boiler they need for their home.

If you click here, you can get a fixed price on a boiler that’s suitable for your home.

You will also see the cost of a Viessmann 100-W boiler if this is the boiler you’re set on purchasing.

Buy a Viessmann Vitodens 100-w boiler online now with Boiler Central

We have a range of guides on the recommended boilers to purchase if you need a little more help or for what type of boiler you need for your home.

12-year warranty

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

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

Boiler Central is the only company to offer a tremendous 12-year warranty on all Viessmann boilers.

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

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Written by
James Elston
James Elston Director Of Boiler Central
Posted on: 1st January 2024

James Elston is our resident boiler replacement and heating expert here at Boiler Central. With over 20 years experience in the boiler installation industry, James ensures that he knows everything there is about our Gas Safe boiler installations, energy saving and home heating solutions. This can be from simply procuring the latest best combi boilers, to reviewing and ensuring that Boiler Central maintains the highest standards across our boiler installation company.

Get a great deal on a boiler today!

Affordable boilers installed nationwide with FREE next-day installation

Get my fixed price
Get a great price on a Which? Best Buy boiler online in 20 seconds
  • Over 15,000 boiler installed
  • Rated Excellent on Trustpilot
  • Fair, fixed and final prices
  • No pushy salespeople
  • Next-day installation
  • 0% deposit interest-free finance
Next-day fitting available until 2pmGet a quote now >