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 Reviews
Viessmann Combi Boilers Reviews 1

Viessmann Combi Boilers Review

Major benefits of Viessmann boilers include features like: 

Viessmann Combi Boilers Reviews

  • 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 

Model: Viessmann Vitodens 050-W Gas Combi Boiler

viessmann 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%.

Why are combi boilers so popular?

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?

Combi Boiler Reviews
Combi Boiler Reviews

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.

Can I get the next-day boiler installation?

Next Day Boiler Replacement
Boiler Installation

Yes, you can if you order your boiler before 12 pm during the colder months, and 2 pm in the warmer months.

This is next-day boiler fitting nationwide in England, Wales and Scotland. So you do not have to be without heating for long, even in the depths of winter.

Not many boiler companies can fit a boiler at such short notice nationwide. If you need a boiler, get a quote from us as soon as possible.

Installation energy regulations

Over the last few years, the UK has passed some guidelines for boiler installation and energy efficiency:

  • Gas boilers should have at least a 92% ErP efficiency regardless of boiler type.
  • A Combi boiler installation should have one energy-saving feature.
  • You should have functioning time and temperature controls.

So why Let’s Heat?

Let’s Heat Are Quality & Accredited Boiler Installers

Best Commercial Gas Engineer in Cardiff
Viessmann Combi Boilers Reviews 2

Firstly, Let’s Heat professional engineers and emergency plumbers provide a professional and reliable plumbing and heating service. Accordingly, that includes Boiler Installation in Cardiff and the surrounding CF postcode area in South Wales.

Secondly, our boiler installation and repair team is fully qualified and ensured to the highest standards. As can be seen, we take pride in producing exemplary work standards which include completing all boiler installation needs. 

Thirdly, the Let’s Heat team are high-quality professional engineers who have a high 4.9 out of 5 Trustpilot score by our previous happy customers. We are fully accredited by Gas Safe and Corgi registered, as well as FCA approved for all of our financial transactions. 

Lastly, all of our staff at Let’s Heat are experts in their field and have many years of experience. Above all, we have work on a wide selection of emergency plumbing, heating solutions and services throughout Cardiff, the rest of Wales & the UK.

Because we care

Are you still a little confused about where to start or who to use?

Our easy-to-use online questionnaire will help you with what you need to know. In short, we make sure that you have the correct solution for your needs. We will also ensure that you are completely happy with the solution.

Why else?

heating engineer in cardiff
  • We work in Cardiff and the surrounding areas of South Wales.
  • We are reliable, professional and trustworthy.
  • High Trustpilot score of 4.9 out of 5.
  • We can travel anywhere throughout the UK.
  • Gas Safe Accredited (corgi registered).
  • Our finance is FCA accredited.
  • We provide a 12-month snag guarantee.
  • Our prices are very competitive.
  • We make sure your house is kept clean and tidy during work.
  • Our workmen use floor protection.
  • We dispose of your rubbish correctly.

Full range of heating & plumbing services provided by Let’s Heat:

Have any further questions, please see our FAQ Page – or if you want to check our Gas Safe Registration click here or if ayou want to see our near 5 star Trustpilot rating please click here!

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Viessmann combi boilers FAQs

  1. 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.

  2. 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.

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

    The average combi boiler cost is £1,800.

  4. 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.

  5. 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.