Today, when every square meter and every unit of energy counts, in the spirit of energy efficiency, environmental protection and maximized living comfort, craft businesses, energy consultants and homeowners cannot avoid calculating heating load by room. But what exactly is behind this term? And why does it play such a decisive role in choosing an optimal heat pump?

The room-by-room heating load calculation is used to determine the exact heat requirement for each room in a building. Not only is it a technical must, but it also ensures that every corner of our home receives just the right amount of heat. In this post, we'll break down this process, explain its role in choosing the right heat pump, and explain why this seemingly small calculation can have a big impact on our environment and our wallets. So let's take a closer look at the heat in our rooms and why it takes more than just a thermostat to create an energy-efficient home.

Basics of heat load calculation: Why is it essential?

Difference between Heat load and room-by-room heating load calculation

Die heat load Or even heating capacity Describes the amount of energy that the heating system requires to heat and maintain a building at a room temperature of around 20-22°C, even on the coldest days of the year. It is virtually the “performance” that our heating systems must fulfill. It should be noted that it is not only a question of compensating for heat losses, but also of adapting to changing climatic conditions and different patterns of use of the rooms. This heat input is expressed in watts (W) or kilowatts (kW) and takes into account regional differences, depending on the exact location for outdoor temperatures (climate map) is calculated at around -10°C and colder. The heating load can be effectively reduced through targeted thermal insulation measures.

Die room-by-room heating load calculation goes one step further. Instead of making a general calculation for the entire building, it looks at each room individually. This means that the specific requirements and conditions of each room — such as size, insulation, number and type of windows, and many other factors — are included in the calculation. The result is a tailor-made heating solution for every room that ensures both comfort and efficiency. This means that all heating surfaces can be designed in such a way that each room can be heated according to its actual heat requirement.

Unfortunately, in many cases, the heat load is not correctly determined. In Germany, studies by the German Federal Environmental Foundation have shown that boilers are often almost twice to three times as large as they actually need to be (link). This not only leads to higher acquisition costs, but also to inefficient operation and thus to more everyday costs. Here are some of the problems that arise as a result:

• The pumps in the system are oversized and consume an unnecessary amount of electricity.
• Modern, efficient boilers do not operate at their best (increased wear).
• User behavior, controller settings and hydraulic integration of the heat source must also be considered. Read more about this in our article on hydraulic balancing using method B.

When modernizing boilers, it is therefore essential to precisely determine the current heat load to determine the output of the heat generator. This applies in particular to older buildings, where there is often no documentation on the heat transfer coefficients (U-values, formerly known as k-values). Historically speaking, many older boilers have tended to be oversized, and over time, buildings have been energetically optimised — through measures such as external insulation or the installation of new windows. Therefore, it is risky to accept the heating capacity of the previous boiler blindly and without further calculations.

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The standards DIN EN 12831:2017 and DIN/TS 12831-1:2020 -04

To ensure that the heat load calculation is also carried out correctly, it follows a standardized procedure, which is described in the DIN EN 12831 is fixed.

Die DIN EN 12831:2017 is a European standard which is the method for determining the standard heat load of individual rooms, parts of buildings and complete buildings. The standard heat load is defined as the heat output that is required to ensure the specified standard internal temperature under specified standard outdoor conditions.

Die DIN/TS 12831-1:2020 -04 is a technical specification that was developed specifically for room-by-room heating load calculation. It is based on the recognized method of heat load calculation in accordance with DIN EN 12831-1:2017, Section 6, the detailed standard procedure. This method provides a very precise basis for designing heating systems, but requires comprehensive knowledge of geometric and thermotechnical parameters. While this can result in a great deal of effort in certain contexts, such as plant engineering changes or when evaluating existing buildings, DIN EN 12831-1:2017 also presents simplified procedures in sections 7 and 8. These are adjustments to the detailed standard procedure and are suitable for situations where fewer details are available or necessary. It is important to stress that this specification covers both the detailed and simplified procedures and also provides, in a special section, a procedure for roughly determining the building's heating load by measuring amounts of heat or consumption.

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Building components: How do they influence heat losses?

A building is much more than just four walls and a roof. It consists of a variety of elements and materials, all of which have a different effect on heating load and energy efficiency. The key to optimizing energy consumption and reducing heat loss is understanding the role of each of these components.

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Heat losses through the building envelope

Simply put, heat loss results from a combination of:

Transmission heat loss - Losses due to building envelope

These losses are caused by heat conduction within the components in the building envelope. They are calculated by multiplying the area of each component by its heat transfer coefficient (U-value) and the temperature difference between inside and outside.

Ventilation heat loss - Losses due to ventilation

These losses are caused by the exchange of air between the interior of the building and the outside air. The amount of heat lost depends on the amount of air exchanged, the difference in temperature between indoor and outdoor air, and the specific heat capacity of the air.

Additional heating capacity - Additional power required due to interrupted heating mode, e.g. night-time reduction

When the heating is turned down or switched off during the night or at other times to save energy, the building naturally cools down. After this heating break, in order to reach the desired room temperature again, a higher energy supply must be provided than in regular heating mode. This additional energy supply is referred to as additional heating capacity.

Through the so-called “Envelope process” The total heating load of the building is calculated by combining the transmission and ventilation heat losses and, if applicable, additional heating capacity. The method determines the heat load of a building based on the heat losses that occur through the building envelope (i.e. outer walls, roof, windows, doors, floors against unheated rooms or the ground). But what is the composition of this building envelope?

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Building geometry and size

The larger the floor area and volume of a building, the more area there is potentially through which heat can escape. A large building with many rooms and an extensive floor space will generally require more energy to be heated than a smaller building with similar insulation properties. The shape of the building can influence the number of thermal bridges. A thermal bridge is an area in a building envelope (balcony connections, window frames, ventilation ducts) where heat is transferred faster than in neighboring areas. Complex building shapes, such as those with many corners, projections or recesses, can have more potential thermal bridges than simple, compact building shapes.

example: Imagine two buildings. The first is a simple rectangular building without many architectural features. The second building has the same floor space but is much more complex, with several bay windows, balconies and different roof shapes.

Both buildings have the same floor space, but the second building, due to its complex shape, has more outdoor space (e.g. walls and roof) through which heat can escape. In addition, the many architectural details, such as bay windows and balconies, offer potential locations for thermal bridges. Therefore, even if the second building has the same insulation as the first building, it could have a higher heating requirement.

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Important Components of the building envelope

• external walls: The outer walls of a building are the primary barriers that separate the interior from external climatic conditions. Their construction, thickness and materials used have a significant effect on how much heat is transferred from the building to the outside or from outside to inside. Different materials have different thermal conductivities. For example, concrete conducts heat better than wood. This means that without additional insulation, a wall made of pure concrete would transfer more heat from the interior of the building to the outside in winter than a wooden wall. The thickness of the wall also matters. A thicker wall generally offers better thermal resistance than a thinner one. Insulation materials are specifically designed to minimize heat flow. They have low thermal conductivity and can therefore significantly reduce the transmission heat loss of an outer wall. This means that despite colder outside temperatures, the internal temperature of a well-insulated building can be kept stable without excessively stressing the heating systems.

• Windows and external doors: Windows and exterior doors are often critical areas in terms of a building's heat loss. While the walls, roof and floor are often covered with thick layers of insulation, windows and doors, if not correctly selected and installed, can result in significant energy loss. Simple glazing consists of only a single layer of glass and therefore offers little resistance to heat transfer. The result is high heat loss, which can lead to high heating costs, especially in colder months. Double glazing, as the name suggests, uses two layers of glass separated by a space. This gap, often filled with an inert gas such as argon, acts as an insulating layer and significantly reduces heat loss. Triple glazing goes one step further and uses three layers of glass. Exterior doors play just as important a role as windows when it comes to insulating a building. Even though they usually cover a smaller area compared to the windows, poorly insulated or leaking doors can cause significant heat loss. Most modern exterior doors consist of a core of insulating material surrounded by durable exterior materials such as wood, metal, or plastic. The choice of materials influences not only the appearance and safety of the door, but also its insulation properties. For example, solid wood doors often provide good natural insulation, while metal doors, unless equipped with a thermal interrupter, can lead to higher heat losses. An often overlooked aspect of exterior doors is the seals, which are worn or leaking. A well-chosen and built-in door threshold can also help to minimize heat loss and prevent drafts.

• Roof and ceiling: The roof of a building has the challenging task of protecting against all weather adversities, from scorching summer sun to cold winter frost. Precisely because heat naturally rises upwards, an insufficiently insulated roof can become one of the main loss points for the heat generated in the building. A roof usually consists of several layers, starting with the outer covering (e.g. tiles, slate or sheet metal) to a base, insulation materials and the inner ceiling. Insulation plays a key role in this. Modern insulation materials such as mineral wool, cellulose or wood fibers have excellent insulation properties and can significantly reduce heat loss. The slope of the roof can also have an effect on heat loss. A steeply sloped roof has a larger surface area than a flat roof and therefore potentially offers more room for heat loss, particularly if it is not properly insulated. However, the slope can also offer advantages, for example through improved drainage of rainwater or snow. The ceilings in a house, in particular the ceiling on the top floor, which borders directly on the roof, are also important for thermal insulation. Thermal bridges can occur here, for example as a result of light or ventilation penetrations, which increase heat loss. It therefore matters whether the ceiling is adjacent to a heated or unheated room.

• Floors: Floors are those parts of a building that are constantly in direct contact with the occupants. A cold floor can therefore directly impair our sense of well-being and at the same time be an indicator of inefficient use of heat. Floors that lie directly on the ground or are in contact with unheated cellars are particularly susceptible to heat loss. The ground has a constant, usually low temperature and can therefore, if there is no adequate insulation, remove the heat from the rooms above. Cold air can circulate in unheated cellars, which also draws heat from the floors of the rooms above. An effective insulation layer under the floor, e.g. made of cellulose or wood fibers, can significantly reduce heat transfer to the ground or to the basement. The type of floor covering can also contribute to thermal insulation: carpets and wooden floors provide an additional layer of insulation, while tiles, although pleasantly cool in summer, can conduct more heat in winter.

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Importance of construction status and thermal insulation measures

The state in which a building is located has a significant influence on heat loss. Old buildings built before the introduction of modern building regulations and techniques tend to be less energy efficient than new buildings. When renovating old buildings, it is therefore particularly important to check the thermal insulation measures and, if necessary, optimize them.

The condition of a building is decisive for how efficiently it keeps its heat. In particular, old buildings, which were often built before stricter energy standards, often have significant weaknesses in thermal insulation. For example, energy can be lost unnecessarily due to leaking windows or poorly insulated walls. The result: higher heating costs and an unpleasant indoor climate.

If you move into an old building or own such a building, thermal insulation measures are often the key to significant energy savings. Thermal insulation measures can take the form of additional insulation, replacement of windows or doors, or even the use of special sealing methods. These measures reduce heat loss and help to reduce the heating load and thus also the heating costs. Think of an old town house whose beautiful but old wooden windows may look charming but constantly let cold air in. Replacing such windows with modern, double or triple glazed models can significantly reduce heat transfer and thus ensure a warmer home with lower heating costs.

If no more precise data is available on the heat transfer coefficients of individual components, the U-values are determined in accordance with DIN 12831 based on the building typology.

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Heating surface optimization: How does the heating surface design influence energy consumption?

The heating surface design plays an important role when it comes to how efficiently a building is heated. Not only the choice of the right radiators or heat exchangers, but also their correct sizing has a direct influence on energy consumption and the resulting heating costs.

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Choosing the heating system

There are various types of heating systems, from traditional radiator radiators to floor or wall heaters. Each system has its own advantages and disadvantages in terms of heat transfer.

• radiator: Classic radiators generate convection heat, which causes warm air to rise and cold air to descend. This can lead to temperature differences in the room, especially between the floor and ceiling. Radiators are the common form of heat emission, especially in many older buildings. They usually heat up quickly and can transfer heat to the room in a very short time. However, their efficiency and efficiency depend heavily on their size, design and placement in the room. Often, they are placed under windows to compensate for cold air flows, but this can lead to heat loss.
• Floor and wall heating systems: These systems distribute heat over a larger area and use radiant heat. This creates a more uniform temperature distribution in the room, which increases comfort and reduces energy consumption, as fewer temperature fluctuations have to be compensated for. If correctly sized, floor heating can result in lower energy consumption as it works efficiently at lower flow temperatures. An additional advantage is that it is invisible and therefore does not take up any other usable space.

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Appropriate sizing

Overdimensioning or undersizing the heating surfaces can significantly influence energy consumption. A radiator that is too large in a small room will cause the temperature to rise quickly, which can lead to excessive energy consumption. Conversely, a radiator that is too small cannot provide enough heat in a large room, which causes the heating system to run constantly to reach the desired temperature.

The dimensions of the heating surfaces therefore significantly influence the efficiency and energy consumption of a heating system. Especially when you want to become independent of fossil fuels and increasingly use heat pumps as a heating source, the correct layout of the heating surfaces becomes all the more relevant.

Old buildings are often equipped with heating systems based on high flow and return temperatures, such as 75°C and 65°C. Heat pumps, on the other hand, work particularly efficiently at low flow temperatures. For their efficient use, it is therefore important that heat is emitted in the building via heating surfaces, which can deliver an appropriate heat output even at lower temperatures.

The terms “flow” and “return flow” refer to the circulation of heating water in a heating system.

• flow temperature: This describes the temperature of the water when it comes from the heat source (e.g. a boiler or a heat pump) and enters the heating system, such as radiators or underfloor heating. This means that the water is at the flow temperature when it is on its way to release the heat in the rooms. A higher flow temperature usually also means higher energy consumption, as the water has to be heated more.‍
• return temperature: After the heating water has transferred its heat to the rooms, it flows back to the heat source to be heated again. The temperature that the water is at this point in time is known as the return temperature. It is usually lower than the flow temperature, as the water cools as it flows through the radiators or floor heating.

The difference between flow and return temperature is also known as”spread“means. An optimized spread is an indicator of a well-adjusted heating system. The ratio of flow and return temperatures is decisive.

Due to its extensive expansion, floor heating can ensure a pleasant room temperature even at low temperatures. In buildings with classic radiators, on the other hand, it should be carefully checked whether the existing heating surfaces can provide the required heat even at a low flow temperature.

The dimensions of the heating surfaces have a direct effect on the flow temperature required by a heating system. The heart of a heat pump, the compressor, increases the temperature of the refrigerant. The lower the temperature difference between the heat source (e.g. ground or outdoor air) and the required flow temperature, the more efficiently the heat pump can work.

For example, if the flow temperature is reduced in a building with classic radiators, these radiators could not emit enough heat in some rooms. It is therefore important to determine in advance exactly what heating capacity is required in the individual rooms and whether the existing radiators can still supply this even at a lower flow temperature. In some cases, it may be necessary to install larger radiators or fundamentally rethink the heating system.

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Roomwise heating load calculation: How do you determine the optimal heat supply?

Calculation of heating load by room is an essential step in determining the heat requirement of a building and the optimal heat supply. It makes it possible to precisely determine the heat requirement of each individual room and thus contributes to efficient and cost-effective heating planning.

Heat losses are unavoidable in every building. They arise from the factors described above, which are directly related to the structural characteristics and use of the building. The transmission heat loss is one of these factors that occurs directly through the building envelope, such as exterior walls, roof and windows. To calculate this loss, it is necessary to understand U value and heat transfer coefficient decisively. These values provide insights into the insulation efficiency of the components, and therefore how well they can retain or lose heat.

At the same time, the Ventilation heat loss , which describes the heat loss due to air exchange between the interior of the building and the outside air. This loss is significantly influenced by air exchange, which in turn depends on the density of the building and the volume of the room.

Finally, there is the Additional heating capacity, which relates in particular to the storage mass of the building. The storage mass of a building — whether light or heavy — plays a decisive role when it comes to how quickly a building must be reheated after being lowered.

It is therefore obvious that the correct understanding of these three components — transmission heat loss due to U-values, ventilation heat loss due to air exchange and additional heating capacity through the storage mass — is essential to determine the optimal heat supply to a building. In the following, we will look at these factors in more detail and in particular how they are taken into account in the room-by-room heating load calculation.

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Methods for precise heat load calculation

There are various methods for calculating the heat load of a room or an entire building. The basic idea is always the same: It is determined how much heat is required to maintain a specific indoor temperature while colder temperatures prevail outside. In order to determine this heat requirement, aspects such as the insulation quality of the building, the type and quality of the windows and doors, and the size and orientation of the rooms are taken into account. Specialized software programs, such as autarc, help to carry out these complex calculations. Read more about this in our blog post: A comparison of the best software solutions for heat pump planning.

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Significance of U-value and heat transfer coefficients: core factors of heat load calculation

In heat load calculation, terms such as U value and the heat transfer coefficient a crucial role. The U value indicates how well a component is insulated. The lower the U-value, the better the insulation. The heat transfer coefficient, on the other hand, describes how much heat is transferred through a component. These two values are essential to understand how much heat a building loses and how much must be supplied to reach a desired indoor temperature.

U values: These show how much heat is transferred over the 1m² area of a component (such as window, door, ceiling) with a temperature difference of 1°C. A low U-value stands for better insulation of the component. Formula: U = 1/(sum of the resistances of the layers)

Also important:

• Unknown U values: If the exact U-values are unknown, typical values based on the age of the component are used from DIN EN 12831 tables (various construction age groups from 1918 to 1995).
• Flat-rate heat bridge surcharge: A standard surcharge of 0.10 W/m²·K for thermal bridges is taken into account to compensate for unexpected heat losses.
• room temperature: A uniform room temperature of 20°C is assumed unless other specific values are agreed.
• Simplified temperature correction factors: Depending on the position of the component, e.g. whether it borders an unheated room or the ground, standardized correction factors are used.

Luftwechsel: Determining ventilation heat loss requires knowledge of how intensively and frequently a room is ventilated. Factors such as building density and room volume are taken into account. Additional considerations must be made for industrial buildings or building systems with ventilation systems.

The air exchange rate indicates how often the entire room volume is replaced by new air per hour. However, it's important to note that this rate doesn't necessarily mean that the entire room is being flooded with fresh air. This is due to the fact that the room geometry also has a significant influence on the distribution of the outside air supplied.

In situations where the people present are the main source of foreign air emissions, such as in offices or warehouses, an air exchange rate of 1/h through free ventilation can be both achievable and sufficient. This means that the entire room air is renewed once in one hour.

Also important:

• Tightness of the building: Based on the assumed building density, the guidelines are assumed, such as “existing building - tight” [n = 0.25 h/1], “existing building - less tight” [n = 0.5 h/1], and “existing building - leaking” [n = 1.0 h/1].
• Volume calculation: The volume of the building must be determined in order to calculate the ventilation heat loss precisely. The standard outdoor temperature in accordance with DIN EN 12831 is used here.

Storage mass: Storage mass refers to the ability of a building material or structure to store heat and slowly release it again. High-density materials, such as stone, concrete, or brick, usually have a high storage mass. Once heated, they release this heat slowly over hours or even days, even when the heating source is no longer active. The presence of massive components with a high storage mass in the building can result in a reduction in the required heating capacity. This is because these materials tend to store and evenly release heat over a longer period of time, reducing temperature fluctuations. Conversely, this means that buildings with lower storage mass react more quickly to changes in temperature and may therefore require higher heating capacity to maintain a constant internal temperature.

Also important:

• Building dimensions: A lightweight building mass (l) is present in structures with suspended ceilings, raised floors or lightweight walls, for example. They store less heat and can therefore react more quickly to changes in temperature. A medium-weight or heavy building mass (s) is the case with concrete ceilings, walls or floors and masonry. They have a higher storage capacity and emit heat over longer periods of time.
• reheating factor: This factor takes into account how quickly a room must be brought back to the desired temperature after a cooling phase. It depends on the dimensions of the building mentioned above, the air exchange and the duration and depth of the temperature reduction.

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Inclusion of internal temperature, external design temperature and energy demand

The difference between the indoor and outdoor temperatures of a building is a key factor when it comes to correctly calculating heating requirements. This temperature difference, also known as a temperature gradient, directly influences how much heat flows through the components of a building. The greater the difference between indoor and outdoor temperatures, the greater the drive for heat to flow from an area with a higher temperature to an area with a lower temperature.

In order to determine the optimal heat supply, you must select the desired indoor temperature, the external design temperature (i.e. the lowest expected outside temperature) and the entire energy requirement Take into account the building. While the indoor temperature is often set at a comfort value such as 20 degrees Celsius, the outdoor design temperature can vary significantly depending on geographical location and local climate. The energy requirement is the sum of the heat demand of all rooms, taking into account all structural properties and environmental conditions.

example: Assume that a building is located in a region where the outdoor design temperature is -10°C in accordance with the standard. If the desired internal temperature of the building is 20°C, then the temperature difference is 30°C.

For each component (e.g. outer wall, window), the heat transfer coefficient (U-value) is used to calculate the heat flow through this element. If you multiply the U-value of a component by its area and the temperature difference, you get the heat loss of this element.

In practice, this means: If the U-value of an outer wall is 0.3 W/ (m²·K) and the wall has an area of 100 m², then the heat loss of this wall with a temperature difference of 30°C is:

0.3 W/ (m²·K) × 100 m² × 30 K = 900 W or 0.9 kW.

The higher the temperature difference and the worse the U-value of a component, the higher the heat loss will be.

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From heat load to heat pump: What role does sizing play in the selection?

The sizing of a heat pump is the last decisive step in planning to ensure an efficient and powerful heating system in a building. What is there to consider here?

A key problem that is often overlooked is the oversizing of heating systems. Imagine a heat pump that was designed for a much larger building than the one in which it is actually installed. This pump would not only consume too much energy, but would also result in unnecessarily high operating costs. In addition, it would switch on and off more frequently, which would lead to increased wear and therefore to a shorter service life. A system that is too large can also cause unwanted temperature fluctuations in the building.

On the other hand, there is the heat pump output, which must essentially cover the energy requirements of a house on the coldest days of the year. If the heating output of the heat pump is too low, the house cannot be brought to the desired temperature, which leads to an unpleasant living environment. It is therefore necessary to find the right balance and adjust the heat pump exactly to the actual heat requirement of the house.

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Sizing factors

Building area: The heat requirement increases in proportion to the size of the building. This is not only about the floor space, but also about the height of the room, as a higher room has more volume that needs to be heated.

Prior heating consumption: These are the energy reserves that are already stored in the system before the heat pump starts working. This may be due to previous heating cycles or other energy sources in the system.

Insulation level of the building: A building with efficient insulation retains heat better and reduces heat consumption. Detailed studies of the U-value of the components can provide information here. The U-value indicates how good the insulation properties of a material are.

Regional climate: This is not just about the average winter temperature. Extreme cold spells, wind speeds and humidity can also influence heating requirements.

type of heating elements: Different heating elements have different response times and heat transfer efficiencies. Underfloor heating, for example, emits its heat primarily through radiation and reacts more slowly than a radiator.

Residents' heating habits: It is also important to know at what times heating takes place, whether continuously or at intervals, and what the desired internal temperature is.

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Choose the right heat pump

The selection of the right heat pump according to the determined heat load follows a systematic approach that takes into account the technical requirements and individual needs. It is not just a question of choosing a powerful device, but one that is precisely tailored to the needs of your home.

1. Determine the heat load: Before you select the right heat pump, you need to know the heating requirements of your building. The standardized heat load calculation in accordance with DIN EN 12831 is the standard procedure for this, which enables a precise and detailed analysis of the heat demand. More information in the article above.
2. Take into account living space: Multiply the calculated heat requirement per m² of living space by the total area of your building. This gives you the total heat requirement in kW. Example calculation for an old building: Assume that you live in an old building without thermal insulation with a living area of 120 m², then the heat requirement would be: 130 m² x 0.12 kW/m² = 15.6 kW. This means that for your old building, you need a heat pump that can produce an output of around 15.6 kW. When choosing, you should also consider any future changes, such as improved thermal insulation or an extension of the living space. Heat pumps ranging in size from 3 to 12 kW are generally preferred for well-insulated single-family homes. However, an older old building or larger buildings may require heat pumps with outputs of up to 15 or 16 kW.‍
3. Use indicative values: If you have not yet used a detailed procedure or would like to get a quick overview, you can use the guidelines in DIN EN 12831. These values are useful for obtaining an initial estimate of heat demand, but should be supplemented by a detailed analysis for final decisions (see table below).‍
4. Avoid oversizing: It is important not to simply select the heat pump with the highest available output. An oversized heat pump leads to unnecessary costs and can work inefficiently as it switches on and off more frequently. This can also result in a shortened pump life.‍
5. Take into account future changes: If you are planning to expand your building or add additional insulation in the near future, consider this when choosing the heat pump. It may make sense to choose a heat pump with a slightly higher output to cover future requirements.‍
6. Compare manufacturers and models: There are a variety of heat pump manufacturers and models on the market. Compare specifications, energy efficiency, price, and customer reviews to make the best choice for your building.‍
7. Involvement of specialist partners: Finally, it is always advisable to consult a specialist when it comes to choosing and installing a heat pump. An expert can give you detailed advice and ensure that you make the right choice.‍
8. Software support: Software enables specialist partners, HVAC companies and energy consultants to work safely and efficiently through guided processes. In particular, they provide essential support for the standard-compliant recording of heating load, heating surfaces and hydraulic balancing in accordance with method B. All processes that used to take a lot of time and effort are now significantly accelerated by software solutions. In just a few minutes, all data can be collected in accordance with standards and an initial pre-selection of the appropriate heat pump can be made.

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Conclusion

The heat load calculation is an indispensable tool when choosing the ideal heat pump for your building. It makes it possible to determine the exact heat requirement, which avoids oversizing or underdimensioning.

Die Basics of heat load calculation show why this calculation is essential for heating efficiency and functionality. You can only select the appropriate heating system if you know the exact heat requirement.

Diverse Building components, such as windows, roofs or walls, play a decisive role in heat losses. Their nature and quality can significantly influence the required heating capacity. A well-insulated building, for example, requires far less heating energy than a poorly insulated building.

Die Heating surface optimization makes it clear that energy consumption is influenced not only by the total area, but also by the layout and distribution of the heating surfaces in the building. Careful planning and layout can result in significant energy savings.

And finally, the sizing in “From heat load to heat pump” ensures that the selected heat pump meets exactly the requirements of the building. The precise coordination of heating load and heat pump output is essential for energy-efficient and convenient room temperature control.

In summary, room-by-room heating load calculation is the key to ensuring both energy savings and optimal living comfort. Anyone investing in a heat pump should therefore never skip this step and rely on the expertise of experts when in doubt.

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Find Choose the right heat pump with autarc!

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Determine the exact heat load of your building, consider all relevant components and precisely size your heat pump! With autarc, you can also find out which funding is available for your project and apply for it directly via the software. Start your journey to a more efficiently heated home and discover the benefits of autarc.

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