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viessmann donates 5 milion euros to ukrane
Viessmann Company News

Viessmann Foundation donates five million euros


The Viessmann Foundation is donating five million euros to support generations to come who urgently need help. The majority of this amount is dedicated to families and children in and from Ukraine. As a family for positive change, the Viessmann Group wants to set a clear signal and fulfill its social responsibility for generations to come. That is why the Viessmann Foundation is donating a total of five million euros to people who need our help and solidarity most urgently this winter.

To support generations to come who are in urgent need of help this Christmas, the Viessmann Foundation is donating a total of five million euros. More than half of the money goes to aid projects that support children and families in and from Ukraine in their time of need. Two million euros will be donated by the Viessmann national companies to local donation projects of their own choice, with the aim of creating living spaces for generations to come.

“The situation in Ukraine affects us all,” says Maximilian Viessmann, CEO of the Viessmann Group. “As a family business with family members in and from Ukraine, we are sending a clear signal of social responsibility to those who need our help and solidarity most urgently this winter. Therefore, the majority of our historic donation of a total of five million euros via the Viessmann Foundation supports children and families in and from Ukraine, who particularly suffer from the consequences of this cruel war during the cold season.”

Two million euros will be donated in the first quarter of 2023 to three major organizations focused on families in need from Ukraine and on building infrastructure and enabling local schooling in these difficult times.

The following projects are supported:

  • Aktion Deutschland hilft – The “Donating heat” project helps people in Ukraine to winter-proof their homes. The project also provides generators and power stations to generate electricity.
  • Unicef – Access to continuous learning for children in Ukraine with home learning kits.
  • Save the Children – Children’s Emergency Fund for worldwide support and Ukraine Emergency Aid in Germany.

A further two million euros will be distributed to the national companies of the Viessmann Group according to the number of employees. Each country receives at least 2500 euros to support local organizations. The managing directors of the national companies, together with their teams, can support local charitable organizations or initiatives with the approved donations to give something back to the local community. The Viessmann Foundation’s mission statement serves as the basis for selecting donation projects: “Shaping sustainable living spaces for future generations together – with everything we do.” This ensures that only initiatives that are in line with the mission statement benefit from the donation.

The majority of the remaining one million euros was already donated by Viessmann employees and the company in spring to support Ukrainian families affected by the war. The donations went to local initiatives that supported Ukrainians as they left their country, as well as to organizations for integration assistance and reconstruction. The remaining amount is reserved for further reconstruction aid in Ukraine. 

About Viessmann

Viessmann is the leading provider of climate solutions for all living spaces. The ‘Integrated Viessmann Solutions Offering’ enables users to connect products and systems seamlessly via digital platforms and services for climate (heating, cooling, air quality) and refrigeration solutions. All solutions are based on renewable energy and maximum efficiency. All activities of the family company, founded in 1917, are based on its purpose. “We create living spaces for generations to come” – that is the responsibility of the global Viessmann family with 13000 members.

About the Viessmann Foundation

The Viessmann Foundation was established in 2020 and has the mission statement: “Creating sustainable living spaces for generations to come together – with all we do.” Based on this, the foundation works with internal and external partners on regional and international projects on the topics of sustainable living spaces (“Living Spaces”) and generations to come (“Generations to Come”) and pursues the approach of bringing out the best in all of us (“Best in all of us”). By working together, the Viessmann Foundation achieves greater results than it would on its own, creating diverse opportunities to make the world a little better.

Intelligent Heating Controls

Save heating costs with ViCare Plus and smart ViCare thermostats

  • Extension of the ViCare app to include premium version ViCare Plus with innovative Savings Assistant feature package
  • Unique Intelligent Heat Control communicates directly with the heating system
  • Addition of ViCare smart devices enables continuous automatic flow balancing for maximum energy savings

Back in 2017, the European Building Automation and Controls Association (EUBAC) reported that energy savings of roughly 27 percent are possible just through the use of modern radiator thermostats. Viessmann’s own studies not only confirm these results but also show that significantly greater savings can be achieved with just a few additional measures, such as Intelligent Heat Control using ViCare Plus and ViCare thermostats. 

In addition to ViCare thermostats, the premium ViCare Plus version with the Savings Assistant is necessary for this. The Savings Assistant includes the unique control algorithm Intelligent Heat Control, a geofencing feature, detailed energy reports with 7-day forecast and allows permanent automatic flow balancing.

Intelligent Heat Control is unique on the market and ensures the greatest possible comfort with the lowest possible energy consumption

The Intelligent Heat Control algorithm developed by Viessmann provides intelligent control of the heating system to ensure that the heat generation is precisely matched to individual requirements while using as little energy as possible. Intelligent Heat Control constantly compares the temperatures and position of the smart thermostats in the individual living spaces. When the room temperatures desired by the occupants are reached, the gas,oil boiler or heat pump automatically receives the command to reduce the heat output. This way, the demand and production of the heat required are balanced in an energy-efficient manner at all times.

However, Intelligent Heat Control offers another money-saving benefit: The innovative calculation algorithm not only reduces energy consumption but also minimizes the frequency of on/off switching operations (“cycling”) of the heating device. Reducing the number of times the device starts significantly extends the life of the components, which lowers the cost of maintaining and servicing the heating system. This requires a Viessmann heating device (built in 2004 or later) that is connected to the internet as well as smart ViCare thermostats installed on radiators or underfloor heating.

Intelligent Heat Control is unique on the market. As a developer and producer of complete, seamlessly interconnected end-to-end solutions – ranging from heating systems with integrated controllers to digital platforms and digital services such as the ViCare app – Viessmann knows every aspect of efficient heat supply down to the last detail. Intelligent Heat Control therefore speaks the same language as the other system components and provides unparalleled benefits to its users.

Geofencing: Automatically save energy when no one is home

The geofencing feature is already available in the ViCare app and now also in the new premium feature package. This feature makes it possible for the heating to detect when no one is in the house or apartment and automatically lowers the temperature in all rooms. As a result, unnecessary heating is avoided, which leads to greater cost savings.

When someone living in the residence starts to return home, the temperature is increased early enough so that all the rooms reach a pleasantly warm temperature by the time they arrive. This enables significant energy savings without any effort, loss of comfort or having to constantly make manual changes to the heating system.

As long as the heating systems have a Vitotronic control system and are connected to the internet, geofencing can be used with the gas condensing boilers of the Vitodens 200 and 300 series, the Vitocrossal 300 and the Vitoladens 300 oil condensing boilers.

Keeping tabs on your energy consumption

If you know when, where and how much energy you have consumed, you can take targeted countermeasures as required and keep your heating costs in check. The new ViCare Plus Savings Assistant premium feature package therefore gives its users valuable information about their energy consumption in detailed energy reports. Based on the data collected over the past seven days, a custom forecast of your energy consumption is also created for the coming week, allowing you to make the appropriate changes.

ViCare users also repeatedly receive individual push messages with helpful tips for optimizing their heating operation, such as “Activate reduced night mode” or “Adjust heating times to daily routine.” If you follow these tips, you are well on your way to saving a lot of energy while still living in a cozy warm home.

Continuous automatic flow balancing for optimal heating operation at all times

Whether single-family homes, rented apartments, new buildings or older ones, the intelligent ViCare thermostats are installed in place of conventional radiator or floor thermostats and enable single room control for individual heating comfort in every room. The “Open window” feature also recognizes if a window is open in the room and automatically reduces the amount of heat supplied to the radiator, preventing you from wasting expensive heat.

The thermostats, which communicate wirelessly with each other as well as with the ViCare app and heating control system, also perform TÜV-certified automatic flow balancing, which is crucial for economical energy consumption. This ensures precise delivery of the heat each room requires and that none of the radiators get too warm while others remain cold. Automatic flow balancing, which used to require a time-consuming procedure to be carried out manually by the installer, is now done fully automatically by the ViCare components – and also saves considerable heating energy.

Attractively priced starter packages make it easy to get started with the ViCare single room control system. A ViCare Plus Savings Assistant subscription is not required. All ViCare components communicate wirelessly so rooms can be added at any time without having to run cables.

Easily add a ViCare Plus subscription at any time

Users can easily add the premium version of the ViCare Plus Savings Assistant in the respective app store (Google Play Store or Apple App Store). You can choose between a monthly or an annual subscription (with a discount for an annual subscription). Viessmann provides ViCare Plus Savings Assistant free of charge for one month so new users can get to know the new service and options.

Benefits for users

  • Significantly lower heating costs through the use of ViCare Plus and automatic flow balancing with ViCare thermostats without having to invest in a new heating system
  • Heating cost savings through Intelligent Heat Control and a globally unique calculation algorithm for automatic optimization of heat generation
  • Only heat when someone is at home (geofencing)
  • Continuous automatic flow balancing through ViCare thermostats ensures optimal heating operation at all times
  • Tailored 7-day forecast of energy consumption

vitodens 200-w
Gas Boilers

What size boiler do I need?

A new boiler should be seen as a necessary home investment, and this is why it’s so important that you make the right choice. When it’s regularly serviced and properly maintained, a boiler should last up to around 15 years, and will be solely responsible for delivering heat and hot water to your home.

When choosing a boiler, size is really important. Too big and it might use too much energy to heat water you’re not going to use and too small, you might find yourself running out of hot water or left with a cool house that cannot heat up properly.

So what factors do you need to consider before choosing a boiler size?

How is boiler size measured?

Before we look at what size boiler you should choose, it’s important to understand how boiler size is measured.

Boilers are sized in kilowatts (kW) rather than physical dimensions. A kilowatt is a unit that is used to measure how much energy the boiler can output as heat. Generally speaking, the more heat and hot water you require, the higher the output you will need, although other factors also play a part in choosing the right size.

This means that boiler size is essentially based on the number of radiators, the number of bathrooms and the number of bedrooms. 

What size boiler should I get?

You can use our handy table below to determine which size boiler is right for your home, depending on the number of radiators, bedrooms and bathrooms.

No of radiatorsNo of bedroomsNo of bathroomsBoiler size
0-5119-18 kW
5-102224-27 kW
10-203328-34 kW
20+4+4+35-43 kW

If your home has more than four bedrooms and three bathrooms, then a combi boiler likely won’t be the best option. Instead, you may need a boiler that is better equipped to deal with high water demand, such as a system or regular boiler. 

Should I choose an oversized boiler?

In the past, homeowners may have been advised to choose a larger boiler to compensate for heat that is lost naturally, such as through the roof, walls and windows of your home. But modern advances in boiler technology means that they’re more efficient than ever, and choosing a bigger boiler than you need isn’t recommended. It could result in wasted energy and is likely to leave you paying more than you need to for your gas bill.


Calculating your heating and hot water usage

When choosing which boiler size is right for your home, it can be important to consider your heating and hot water demands, as well as other factors, such as heat loss and water pressure.

Hot water demand

Most UK households use a combi boiler, which serves both heating and hot water on demand from the mains water supply. They are practical, convenient and cost effective to run. Where there is just one bathroom, they are often quite sufficient to meet the needs of the household as far as hot water is concerned.

If, however, you have a large or growing family, or your home has more than one bathroom, a combi boiler may struggle to provide sufficient hot water. This is because the water is heated as it is used, rather than stored in a tank.

If you are likely to be using more hot water, you will certainly want to consider whether a conventional or system boiler that includes a hot water tank is the right choice.

Ultimately, which type of system you choose will have an impact on the size of boiler you need.

A combi boiler is sized to provide hot water on demand and you will see its capability expressed in terms of how much water it can heat per minute to a defined temperature rise, e.g. 12 litres per minute at 35°C rise.

The higher the flow rate you require, for filling baths more quickly or to have a more powerful shower, for example, the larger your boiler should be. This means that combis are typically oversized in order to meet heating demands, making them less efficient than other types of boilers, such as system and conventional boilers, when heating the home.

System boilers and conventional boilers preheat hot water to be stored in a water cylinder and therefore, hot water flow rate is not as critical. The heat load for an average home can vary from around 10 kW to 20 kW, which means that system boilers and conventional boilers can be sized smaller than combi boilers. They will therefore be more efficient when heating the home, but they require more space. 

Number of radiators

A key factor that will have an effect on the size of boiler you need is the number of radiators. If you have just a few, for example in a small flat, then choosing the smallest suitable boiler will offer you the greatest level of economy and ensure you avoid paying more than you need to for energy.

The average three or four-bedroom house usually has about ten radiators. For this reason, it would require a 24-30 kW combi boiler. A larger house that has more radiators and more bathrooms would need a larger 30-35 kW boiler.

If you have a large house with as many as twenty radiators, a large 35-43 kW combi boiler may be needed to provide sufficient heat with the best economy, or you would be better to change to a system boiler, which could be sized more appropriately.

Other factors to consider

Heat loss

In the past, the physical size of your house was often used as a factor in considering the right size of the boiler. Whilst this still plays a part, a much better way to choose the most effective and efficient boiler size is to have an expert calculate your home’s heat loss.

Heat loss calculations take into account a range of factors including floor area, number of radiators, number and type of windows, insulation and other aspects that will cause heat to be lost from your home.

A heating expert will then use this information to work out how much heat your house will lose on the coldest day of the year, allowing them to advise you on the optimum boiler size.

Type of fuel

The type of fuel available in your property can also affect the size of the boiler you choose, as boilers for different fuels can vary in terms of efficiency.

Most UK homes use gas boilers which offer the greatest level of efficiency, while houses that are not connected to a mains gas supply often choose to use an oil-fired or LPG (liquefied petroleum gas) system instead.

The type of fuel your boiler uses could impact the size you need, and it is recommended that you seek advice from a professional in order to make the best possible investment.

Water pressure

Although this is not usually a concern for newer houses on a mains water supply, some older homes may experience poor water pressure, and this can have an impact on the type and size of boiler you choose.

A combi boiler must be big enough to cope with the amount of water passing through it to be heated – the higher the flow rate, the bigger the boiler should be.

Whilst most manufacturers provide information on the maximum flow rate for their boilers, getting a professional to assist you could make the process easier, ensuring you choose the most economical boiler for your home and helping you to save money in the long term.