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  • Viessmann Combi Boilers Reviews

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  • Viessmann Combi Boilers Reviews

    Updated: December 29, 2023

    Are Viessmann combi boilers good?

    Why Viessmann combi boilers? Efficiency is key to the Viessmann boiler range and is the result of Viessmann’s investment in innovation Dominating the European boiler market, Viessmann is a relatively new entrant to the UK market.

    But thanks to their prestigious German engineering, reliability and superb customer support they have seen huge growth and popularity within a very short period of time.

    Viessmann Combi Boilers Review

    Major benefits of Viessmann boilers include features like: 

    • Technically brilliant boilers e.g. they use stainless steel heat exchangers
    • 10-year guarantee
    • Excellent customer reviews and aftercare
    • High-efficiency A-rated combi boilers 

    Viessmann Vitodens 050-W Gas Combi Boiler

    The Viessmann 050-W is the brand’s entry-level combi boiler.  This offers all of the essentials Viessmann are renowned for on a budget, including the Inox-Radial heat exchanger.

    Compact Size

    Available with multiple size outputs including 29kW and 35kW it is suitable for small and medium-sized properties.  Its dimensions make it quite a compact size for a wall-mounted combi boiler. 


    Efficiency is key to the Viessmann boiler range and is the result of Viessmann’s investment in innovation. This has paid off with the Vitodens 200-W and the Vitodens 222-F both having efficiency ratings of 98% and no boiler in the Viessmann range having efficiency lower than 93%.

    Combi boilers have two functions (providing hot water and heating). As a result, they are very efficient . Green Combi boilers are up to 98% more efficient. Their compact shape and design makes them perfect for homes with limited space. They can also be installed in kitchen cupboards.

    Is a Combi Boilers the perfect choice for my home?

    Combi Boilers take water directly from the mains water supply in your home. To provide an appropriate water flow, they rely on the pressure coming from the mains.

    So if the pressure from the mains is not strong enough, a combi boiler is not, therefore, suitable for your home.

    A combi Boiler comes with two outputs; one for how water and the other is for home heating. Hot water for central heating takes less effort than on-demand hot water. That’s why it’s crucial to choose a boiler that corresponds with your hot water demands.

    Another key point is that if you live in large home with many bathrooms, then a system boiler is what you need.

    How do Combi Boilers work?

    Cold water runs through the combi boilers directly from the main water source. In order to produce heat, the gas fuel is burned. The heat is then transformed from the combustion chamber to the water through a heat exchanger.

    Your thermostat would know when the temperatures drop in your house. Subsequently, it will send a signal to the combi boiler which would fire up and heat your home.

    The minute the required heat is reached, your combi boiler would decrease the produced heat and keep the status quo. As a result, it will reduce your energy waste as well as keep your house warm.

    A Combi boiler directs hot water to any outlet you are using such as a hot tap, a shower or a bath. When you turn off the tap, the central heating duties will be back in action.

    Keep in mind that your Combi boiler directs hot water to the water outlets or the central heating, but not both at the same time.

    What are the Advantages of Combi Boilers?

    A combi boiler is very efficient

    A combi boiler is very efficient when it comes to energy consumption. It would save you a lot of money since it can be used for both providing hot water and heating your home.

    They are small in size

    A combi boiler is perfect for a house that is small in size. You will not need to make space for water tank or cylinder due to that fact that a combi boiler takes water from the mains directly.

    On-demand hot water

    With a combi boiler you don’t need to worry about having enough water in the hot water storage. It will provide hot water instantly.

    Installation Flexibility

    Combi boilers are relatively small and consist of a single unit. As a result, they can offer more flexibility when it comes to their Installation place.

    How long will a combi boilers last?

    Of course, boilers differ in quality and their lifespan. When buying a new boiler, it is important to keep this in mind.

    You might be tempted to buy a cheap boiler in order to save some money. But this is not a good investment in the long run. A low-quality boiler will eventually cost you more on repairs.

    In estimate, combie boilers last 10-15 years. But surely this will depend on the quality of the boiler you buy and how often do you have it serviced.

    You can easily know the quality of a boiler from the warranty they offer. For instance, A boiler with a 10-year warranty have a higher quality than a boiler with a 5-year warranty.

    How long does a combi boiler installation take?

    Boiler installations can take different amounts of time to complete due to such a varied amount of work for each particular home or business.

    Replacing an already-existing combi boiler with a new one should take 3-6 hours.

    Replacing a heat-only boiler with a combi or a system boiler would take 1-2 days.

    Full range of heating & plumbing services provided by Smart Adapt:


    What are the Disadvantages of Combi Boilers?

    1. The Flow Rate is Limited
    Using two or more taps at the same time will reduce the water flow rate. For one thing, we don’t recommend a combi boiler for those who live in larger homes or those who have multiple bathrooms.

    2. Relying on water pressure from the mains
    A combi boiler heats the water coming from the mains. It won’t work adequately if your water pressure is low.

    Are combi boilers cheaper to run?

    The main common reason that users replace their conventional boiler with combi boiler is energy efficiency. You can save up to 40 percent on your energy bill if you replace your 10 to 15 years old boiler with an A-rated combi boiler.

    What’s the average cost of a new boiler fitted in the UK?

    The average combi boiler cost is £1,800.

    Do I need a cold water tank with a combi boiler?

    A combination boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap. As a result, you won’t need a hot water storage cylinder or a cold water storage tank in the roof space.

    Are combi boilers noisy?

    A modern condensing combi boiler has a sound level of somewhere between 40 and 60 decibels as it heats a home.