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Witten by Bernard Morgan (Engineer).
First Published: February 22, 2021. Updated: December 8, 2023

Viessmann Vitodens 111-W Storage Combi Boiler Review

The Viessmann Vitodens 111-W 25kW or 32kW Storage Combi Gas Boiler is a high-efficiency, wall-mounted condensing boiler. It has an impressive efficiency rating of up to 98%, earning it an A rating.

This boiler is LPG compatible and has an extended warranty of 10 years when fitted by Boilerhut. The 32kW model has a central heating maximum output of 32kW and a hot water flow rate of 21.2 litres per minute.

The following costs will be associated with installing the Viessmann Vtodens 111-W:

  • Boiler: £1,900 to £2,100
  • Installation: £1,000 to £1,200
  • Sundries (filters, flues, pipework, etc): £900-£1,100
  • Total: £3,800 to £4,400 (including VAT)

However, depending on your property details, this could be much lower, so please get a quote, and we’ll call you back to discuss it more.

As one of the most popular boilers we install for households with higher hot water demands, we have taken a look at the new 2023 Viessmann Vitodens 111-W Storage Combi Boiler in detail and have highlighted why we recommend it to households where a system boiler may not be suitable or where it’s not practical to have a separate boiler and cylinder.

Key Features of the Viessmann Vitodens 111-W:

  • Modulation ratio of up to 1:10
  • Wall-mounted
  • Easy to read in low light backlit LCD touchscreen
  • Provides a domestic hot water supply equivalent to a 150L unvented cylinder due to the advanced CLS (Cylinder Loading System)
  • 46-litre capacity stainless steel integrated storage tank
  • Hot water delivery of up to 18 L/min
  • Modulating stainless steel cylinder burner
  • Compatible with Open Therm technology
  • Integrated Wi-Fi
  • Remote control via the ViCare smartphone and tablet app
  • Low operating noise – only 49 decibels
  • All components can be accessed from the front for easy servicing
  • Can fill a 140-litre bath in 8 minutes whilst simultaneously supplying a sink or washbasin
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Why choose the Viessmann Vitodens 111-W?

  • Suitable for family homes with 4+ bedrooms and 2+ bathrooms
  • Designed for installation in several locations such as a utility room, kitchen or an airing cupboard
  • Compact dimensions ensure space-saving and allow for the boiler to be installed in living areas
  • Designed, made and assembled in Germany

The Viessmann Vitodens 111-W is a storage combi boiler designed for homes with high hot water demands. Unlike standard combi boilers, it has a water cylinder housed within the unit meaning that there is no need for a separate hot water tank.

With a 46-litre storage capacity, the stainless steel storage tank integrated into the Vitodens 111-W is equipped to simultaneously provide hot water to multiple sources. This makes it an ideal choice for larger houses with multiple bathrooms.

Utilising a Cylinder Loading System (CLS), the Vitodens 111-W replaces the heating coil in most unvented cylinders with a plate heat exchanger. This technology uses a DHW (Domestic Hot Water) pump to circulate cold water from the bottom of the cylinder through the plate heat exchanger and put hot water back into the top.

New for the 2021 model, the Vitodens 111-W has been upgraded to have a modulating ratio of 1:10. The high ratio makes the boiler suitable for use in various properties whilst also ensuring less operating noise – with the boiler operating at 49 decibels. The modulating ratio also means less stress is placed upon the boiler, providing a longer service life for the components.

Up to 10-year warranty

The Vitodens 111-W comes with a 5-year comprehensive warranty as standard, with an extended warranty option of up to 10 years if fitted by a Viessmann-trained partner like Boilerhut. We work closely with Viessmann, offering manufacturer servicing and warranties. Some companies will opt to offer their own warranties rather than paying for the Viessmann warranty.

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Which? Best Buy

The Viessmann Vitodens 111-W was first awarded Which? Best Buy status in 2017. And the Vitodens 111-W’s Best Buy status was first awarded based on feedback from 219 registered Which? Trusted Traders, heating engineers and 9,610 domestic customers.

This feedback covered the experiences of the boiler owners and the views of the installers regarding the ease of servicing, fixing a common fault, availability of parts and spares, build quality and recommendations.

Integrated Wi-Fi

Launched in April 2021, the new Vitodens 111-W notably now has integrated Wi-Fi. This, along with the 111-W’s new control platform, makes monitoring, commissioning and servicing the boiler easier. From an engineer’s perspective, this means that they can now monitor and adjust customers’ boilers remotely using the Vitoguide software.

When using Boilerhut for your installation we work with you to connect your boiler to Viessmann’s systems. We can then monitor that boiler and receive notifications of any issues that may occur. We’ll then work with you and Viessmann to ensure your boiler is fix as soon as possible.

For the engineer, the compatibility with Vitoguide also makes commissioning the boiler easier. It provides a step-by-step guide covering time programmes, heating circuits, heating curves, DHW and the circulation pump.

For the end-user, the integrated Wi-Fi means that the Vitodens 111-W is fully compatible with the battery-powered, RF-connected ViCare Thermostat and the new Vitotrol 100-E smart thermostat. This means that the boiler can not only be controlled using the boiler’s large touchscreen, but it can also be controlled using the Viessmann app on a smartphone or tablet – all without the need for third-party controls.

The ViCare app provides the Vitodens 111-W with the following functionality:

  • Information on the current operating status
  • Quick adjustments to the heating system
  • Time programmes for heating and hot water, by zone


Viessmann, the manufacturer of the Vitodens 111-W, is renowned for its reliability and the quality of the components housed within the boilers it manufactures. All of the components utilised within the Vitodens 111-W are designed and manufactured by Viessmann in-house and designed to work together for maximum performance and reliability.

The reliability of the Vitodens 111-W has been commended by Which?, with the boiler receiving a Which? ‘Best Buy’ award from 2017 to 2019.

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Super Quick Hot Water

The Vitodens 111-W offers rapid abilities and one of the highest draw-off rates of boilers currently on the market.

It can fill a standard bath in just eight minutes whilst also supplying a sink or washbasin simultaneously. Alternatively, it can supply hot water to three showers for up to 15 minutes.

Highly Efficient

Thanks to Viessmann’s patented stainless steel Inox-Radial heat exchanger, the Vitodens 111-W offers exceptional efficiency of up to 98%. This is due to Inox stainless steel having a maximum of 1.2% carbon and a minimum of 10.5% chromium content, efficiently converting the supplied energy into heat whilst consuming lower amounts of fuel, emitting lower CO2 emissions and having less impact on the environment.

This technology creates a furnace-like environment inside a small space. It increases the heat exchanger’s resistance to staining and corrosion, which significantly extends your boiler’s lifespan and contributes to higher savings on your annual energy bills.

Aluminium heat exchangers, which are utilised in many other boilers initially offer slightly higher thermal conductivity but the efficiency will degrade dramatically over time due to the material being prone to corrosion.


One of the initial advantages of the Vitodens 111-W over the competition is the flexibility of where it can be located. Unlike storage combi boilers from competitors such as Worcester Bosch, which are floor-standing, the Vitodens 111-W is instead wall-mounted. This is a great plus point as it saves on floor space and allows you to utilise unused wall space.

It also potentially allows you to upgrade from a standard combi boiler to a storage combi boiler in the same location. This will reduce the need for new water and gas pipes throughout the property.


Due to having an integrated water cylinder, the boiler offers space-saving abilities. It means the unit is housed in one location without a hot water cylinder needing to be installed elsewhere. As everything is housed all in one unit, it also means that you can be confident that you are just dealing with one manufacturer. Plus, with a warranty of up to 10 years available, you can be sure that you will have 10 years with no issues associated with any of the components of your boiler.

Super Quiet Operation

At 49 decibels, the operating noise levels of the Vitodens 111-W are quiet. To put this into perspective, it operates with noise levels that are only marginally louder than those of an A-rated fridge. Due to this, this boiler is quiet enough to be installed in a bedroom with no danger of disturbing your sleep.

Where can you install the Viessmann Vitodens 111-W?

At 950mm (height) x 600mm (width) x 500mm (depth), this isn’t a small boiler. Due to this, you must ensure you have the correct location to install this boiler. Suitable installations include kitchens, utility rooms, garages and airing cupboards.  If you intend to install it in an airing cupboard, you should measure the space available to ensure it will fit.

Measuring correctly is crucial, as not all spaces are large enough to meet Viessmann’s recommended installation guidance, you will also need to ensure clearance is available to the top, bottom and sides. Get a quote with Boilerhut and we’ll call you to discuss this further.

As it weighs 110kg when filled with water, it isn’t a light boiler either. Again, you must consider where this boiler will be installed, as you will require a solid or other suitable wall.

Water flow rate 

To ensure you are choosing the most appropriate boiler for your specific application, we advise that you check your cold water flow rate before choosing this boiler. We recommend that you have a cold water flow rate of 20+ litres per minute; you can check this by timing how long it takes to fill a 5-litre bucket using an outside tap.

Final Thoughts:

In conclusion, the Viessmann Vitodens 111-W is an incredible storage combi boiler for family homes that have higher needs than an average combi boiler could provide.

We install many of these boilers in larger homes with high hot water requirements. Boilerhut is one of the biggest installers of the Vitodens 111-W for a reason: we’re a Viessmann Premium Partner and can offer a 10-year manufacturer warranty and servicing.

Below is our final verdict on the boiler:

  • Efficiency: 10/10
  • Controls and features: 10/10
  • Warranty: 10/10
  • Reliability: 10/10
  • Affordability: 9/10

Overall Score: 49 out of 50.

Get Your FREE Online Quote Today!
Save up to £590 PER YEAR on your heating bills.
Getting a quote takes less than 2 minutes. No obligation.
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Technical Specification:

  • Manufacturer
  • Model
  • Condensing
  • Efficiency Rating
  • Energy Efficiency Class
  • LPG Comptible
  • Warranty
  • Central Heating Max. Output
  • Mounting
  • Weight
  • Dimensions
  • Viessmann
  • Vitodens 111-W
  • Yes
  • 98%
  • A Rated
  • Yes
  • Up to 10 year comprehensive warranty*
  • 32kW
  • Wall Mounted
  • 68kg
  • 950mm (H) x 600mm (W) x 500mm (D)
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