Viessmann offers a full range of high-quality products that represent German engineering at its finest. Extremely reliable boilers that offer great performance are one of the reasons why Viessmann regularly picks up the Which? Best Buy award.
Before we get into the nitty-gritty of which Viessmann boiler is best for your home, here’s a little bit about Viessmann’s brand history.
The History behind The Viessmann Group
The Viessmann Group is a German manufacturer of heating, industrial, and refrigeration systems headquartered in Allendorf, Germany.
Johann Viessman laid down the foundations for heating solutions in 1928, after originally specialising in being a locksmith. At that time, boilers are generally made from cast iron and only slowly reach operating temperature, however, Viessmann developed and built a new generation of boilers, made with steel.
In 1947, Dr Hans Viessmann, the son of Johann took over his father’s company that had 35 employees at the time and grew the company to over 100 employees. Ten years later, Viessmann Group grew to 350 employees and were producing over 5000 boilers a year.
Viessmann’s history is a whole blog in itself. You can visit the Viessmann website for more information on the history of Viessmann.
Viessmann Reviews
Now, let’s have a look at what Viessmann’s customers have to say about their Viessmann boiler. Viessmann is a great boiler brand, it offers reliable boilers at a reasonable price.
With an average rating of 4.5 out of 5 on Trustpilot with 2.5k reviews, you know that you are dealing with a good company that cares about its customers.
One customer said,
“The boiler has been in place for a little over 6 months and has been faultless in operation. Quiet and simple to operate it fulfils all that was needed”.
Another has said, “Great boiler, very efficient and so quiet compared to old boiler. Would recommend”.
Viessmann was an overall 81% brand score during the Which? Best Boiler Brand Survey 2021. Over 8,000 customers and 150 Which? Trusted Traders were asked to score Viessmann boilers based on their reliability, how likely they are to recommend their Viessmann boilers to friends and family, the boilers build quality, their ease of servicing and availability of spares and parts.
They were scored an amazing 5 out of 5 stars for reliability and customer score, and 4 out of 5 stars for their overall engineer recommendation score.
To answer this question, you will need to know whether you have a combi, system, or regular boiler. If you aren’t sure what boiler type you have, don’t worry, we’ve covered it in another blog. If one boiler blog per day is your limit, then we can break it down quickly for you below:
If you’ve decided you want a Viessmann boiler for your home, the next question is going to be ‘which is the best Viessmann boiler for my home?’.
- Combi boilers don’t have any tanks, they heat water from the mains water supply
- System boilers have a hot water storage tank, usually in an airing cupboard
- Regular boilers have a hot water tank and a cold water storage tank (usually in the attic)
Combi boilers tend to be the best option for most UK homes as they don’t require storage tanks and offer heating and hot water on demand. System boilers are usually found in households with more than one bathroom in use at the same time (high hot water demand). Regular boilers are useful for homes with low water pressure as they utilise a ‘gravity fed’ system but due to the tanks involved, most homes switch to a combi boiler when replacing a regular boiler.
Now that we’ve done our homework and figured out which Viessmann boiler type we need, now we can look at which Viessmann boiler model would be best suited to your home.
It’s worth mentioning here that if you take the WarmZilla survey, we’ll automatically recommend the most suitable boilers for you by asking a few simple questions about your home. You don’t need to worry about what kW boiler you need as we’ll suggest the right boilers for your home in the survey.
With this said, if you wanted to compare your current heating system to other boiler brands and models, you could use our Boiler Comparison tool. This tool allows you to compare up to three boilers models or brands at one time, to help you find the perfect new boiler for your home.
Viessmann Vitodens Combi Gas Boilers
Viessmann Vitodens 050-W Combi Gas Boiler
- Weather compensation accessories
- A plug-in time clock
- Wireless receiver options
- Stainless steel heat exchanger
- User-friendly controls
- 7-day programming
- 7” colour touchscreen for maximum control and comfort in your home
- Integrated WiFi, meaning that it can be used with the ViCare app
- Built-in frost protection
- Easy to use controls
Viessmann Vitodens 100-W Combi Gas Boiler
- Backlit LCD touch-screen display
- Frontal access to the boiler for easy maintenance
- An Inox-Radial heat exchanger with an extended 10-year warranty
- Optional Vitotrol 100 controls
- 7-day timer
- Easy to use controls
Viessmann Vitodens 111-W Storage Combi Gas Boiler
The Viessmann Vitodens 111-W Combi boilers range is available in two kW outputs options of 26kW and 35kW. Thanks to its high-efficiency rating of 94% and an ErP A-rating, the Vitodens 111-W 26kW is classed as a very reliable combi gas boiler that stores domestic hot water within an integrated 46-litre unvented cylinder.
Features:
- Backlit LCD touch-screen display
- Frontal access to the boiler for easy maintenance
- Optional Vitotrol 100 controls
- 7-day timer
- Built-in temperature sensor
- Easy to use controls
Viessmann Vitodens 200-W Combi Gas Boiler
The Viessmann Vitodens 200-W Combi boiler range is available in two separate kW outputs; 30kW and 35kW. The Vitodens 200-W has an efficiency rating of 94%, meaning that this combi boiler can help you to reduce the cost of your energy bills. With a warranty of 10 years, you are guaranteed peace of mind with this reliable combi boiler.
Features:
- Vitotronic 100 which is an optional constant temperature controller
- Quiet operation
- 7” colour touchscreen for maximum control and comfort in your home.
- Integrated WiFi, meaning that it can be used with the ViCare app
- Built-in frost protection
- Stainless steel heat exchanger
- MatriX-Plus burner
- Easy to use controls
Viessmann Vitodens 222-F Combi Gas Boiler
The Viessmann Vitodens 222-F Combi boiler range is available in kW outputs of 19kW, 25kW and 32kW. The Vitodens 222-F has an efficiency rating of 92%, making an A-rated boiler. This floor-standing storage boiler has a high flow rate of up to 20 litres per minute, perfect for larger homes with a higher demand for instant hot water.
Features:
- Quiet operation
- 7” colour touchscreen for maximum control and comfort in your home
- Integrated WiFi, meaning that it can be used with the ViCare app
- Built-in frost protection
- Easy to use controls
Viessmann Vitodens System Gas Boilers
Viessmann Vitodens 100-W System Gas Boiler
The Viessmann Vitodens 100-W System boiler range is available in four separate kW outputs; 11kW, 19kW, 25kW and 32kW. Reminder, when purchasing a new or replacement system boiler, you will need the additional space in your home for a hot water cylinder, which is typically installed in an airing cupboard or similar-sized space in your home.
Features:
- Touchscreen display for easy use and reading in dimmer lights
- Stainless steel Inox-Radial heat exchanger
- Low fan speed for quiet operation
- Ability to convert your boiler into an LPG boiler
- Optional Vitotrol 100 controls
- Wired and wireless room thermostats
- 7-day timer
- Built-in frost protection
- User-friendly controls
- Suitable for integration of a solar thermal system
Viessmann Vitodens 200-W System Gas Boiler
The Viessmann Vitodens 200-W System boiler range is available in four separate kW outputs; 11kW, 19kW, 25kW and 32kW. With an efficiency rating of 98%, the Viessmann Vitodens 200-W is the most efficient boiler in the Vitoden’s range. If you were to get the Vitodens 200-W system boiler installed, only 2% of gases used whilst your boiler is in use, will be wasted. That’s only 2p for every £1 you are spending on your energy bills, meaning this system boiler could help you save money on your annual costs.
Features:
- Touchscreen display for easy use
- Stainless steel Inox-Radial heat exchanger
- MatriX Plus burner installed
- Optional WiFi controls
- Built-in frost protection
- User-friendly controls
- Suitable for integration of a solar thermal system
- Up to 98% of the fuel that is used to convert it into heat
Viessmann Vitodens Regular Gas Boiler
Viessmann Vitodens 100-W Regular Gas Boiler
The Viessmann Vitodens 100-W Regular boiler range is available in four separate kW outputs; 13kW, 16kW, 19kW, 26kW and 35kW.
A regular boiler is installed alongside an expansion tank and cold water tank, which are typically installed in the attic of a property, as well as a hot water storage tank, which is located in an airing cupboard, similar to a system boiler. Regular boilers are not ideal for smaller homes with limited space or flats.
Features:
- Inox-Radial heat exchanger for maximum efficiency
- Combined PRV and condense connection
- Easy to use and read display screen
- User-friendly controls
- Built-in frost protection
What kW size Viessmann boiler do I need for my home?
There are a few factors that can have a bearing on the kW boiler that would be best suited for your home:
Number of Radiators
The kW size boiler needed for your home will depend on the number of radiators that are fitted in the property. It is important to ensure that the kW is sufficient enough for the demand for hot water and central heating in your home.
What kW boiler do I need for…
| 6 Radiators | 12kW boiler |
| 8 Radiators | 15kW boiler |
| 12 Radiators | 21kW boiler |
| 15 Radiators | 26kW boiler |
| 20 Radiators | 33kW boiler |
Home Insulation
Insulation plays a factor in your kW boiler requirements. A poorly insulated property suffers from poor heat retention and your boiler needs to work harder to keep the house at the same temperature.
Improving your cavity/loft insulation or upgrading your windows from single to double glazed will have an impact on heat retention. You can also buy thermal leak detectors from a reasonable price on Amazon to identify areas of your home where heat is escaping.
Water Pressure
Different areas can have different water pressure levels and older homes can have lower water pressure than newer homes. If your home has low water pressure, then you will require a higher kW boiler with a good flow rate to ensure you don’t suffer from a drop in pressure when multiple taps are running at the same time.
Maintenance
Like any piece of machinery, the better condition it’s in, the better it will perform. Giving your boiler an annual service is essential in making sure it keeps running smoothly in much the same way as a car.
We have included a table below to help you find the most suitable kW boiler size for your home depending on what boiler type you have.
If you’re unsure what kW means when it comes to your boiler, we have another blog that explains this. Alternatively, you can complete the WarmZilla survey which will ask you about the number of rooms and bathrooms in your home, your demands and specifications, and then calculate what boiler kW size you need accordingly.
Combi Boiler kW Size Guide
| No of bedrooms and bathrooms | Poorly insulated property | Moderately insulated property | Well insulated property |
|---|---|---|---|
| 1 bed + 1 bath | 20kW | 20kW | 18kW |
| 2 bed + 1 bath | 20kW | 20kW | 18kW |
| 2 bed + 2 bath | 24kW | 20kW | 20kW |
| 3 bed + 1 bath | 28kW | 26kW | 24kW |
| 3 bed + 2 bath | 28kW | 28kW | 24kW |
| 4 bed + 1 bath | 30kW | 30kW | 28kW |
| 4 bed + 2 bath | 32kW | 32kW | 30kW |
| 5 bed + 2 bath | 40kW | 35kW | 30kW |
System Boiler kW Size Guide
| No of bedrooms and bathrooms | Poorly insulated property | Moderately insulated property | Well insulated property |
|---|---|---|---|
| 1 bed | 8kW | 7kW | 5kW |
| 2 bed | 8kW | 7kW | 6kW |
| 3 bed | 10kW | 9kW | 6kW |
| 4 bed | 12kW | 10kW | 7kW |
| 5 bed | 15kW | 12kW | 9kW |
| 6+ bed | 18kW | 15kW | 12kW |
Now that we have discussed each boiler type and model that Viessmann have to offer, we hope that this blog has helped you to decide which boiler model is the most suitable for your home. If you are still unsure what boiler is best for your home, why not try our Boiler Comparison tool, which allows you to compare up to three boiler models and brands at one time, to help you find a boiler which meets your families needs and demands.
