Heating design in accordance with VDI 4645
Standard-compliant and efficient heating design with autarc. Optimize your heat pump projects: Plan precisely, save time and secure subsidies.

What is the heating design?
Heating design is the comprehensive process for determining the ideal size and output of a heating system. It includes the exact calculation of a building's heat requirement and the selection of suitable heating components such as heat generators, radiators and pipes. For heat pumps, this is crucial for efficiency, comfort and durability. A correct design prevents over or underdimensioning and guarantees economic operation.
How does the heating system work with autarc?
With autarc, you can design the heating system for heat pumps in accordance with VDI 4645 simply and reliably. The software guides you through all necessary steps, from data collection to system configuration. You receive precise results that enable efficient and eligible planning. This saves you time and prevents planning errors.
- Step 1: Building analysis
- Step 2: Heat pump selection
- Step 3: System configuration
- Step 4: Determining the bivalence point
- Step 5: Results Report
Advantages of heating design with autarc
- Time savings: Speed up your planning processes significantly.
- Legal certainty: Always work in accordance with recognized technical rules.
- Maximum efficiency: Your customers' heat pumps always work in the optimal range.
- Cost savings: Lower your customers' operating costs through precise sizing.
- Eligibility: Plan in accordance with standards and secure subsidies.
Standard-Compliant Planning for efficient Heating Systems

Heat loss calculation in accordance with DIN EN 12831 realistic 3D models
The heat loss calculation in accordance with DIN EN 12831 is the basis for correct heat pump sizing. With autarc, you can precisely determine the exact heat requirement of each room. This prevents over or under dimensioning, ensures optimum comfort and reduces operating costs.
Start now with autarc
Optimize your heating planning with autarc and ensure the success of your heat pump projects. Our intuitive software enables you to design precisely, in accordance with standards and efficiently. Start digitizing your processes today and test the software free of charge for 14 days.

FAQ on heating design
What is VDI 4645?
VDI 4645 is a technical guideline for the planning, design and installation of heat pump systems in residential buildings. It ensures efficiency and quality.
Why is precise heating design important?
A precise design prevents the heat pump from being overdimensioned or undersized. This avoids high operating costs, wear and loss of comfort.
Can I also plan existing buildings with autarc?
autarc has been developed for heating design in existing buildings.
What data do I need for the interpretation?
They need building data such as insulation standards, window quality and information about the heating system and water heating. You can calculate the heat load in the software.
Is funding taken into account in planning?
Planning in accordance with VDI 4645 is often a prerequisite for funding programs. autarc helps you to meet these requirements.
How long does it take to design a heating system with autarc?
autarc speeds up the process significantly. The duration depends on the complexity of the project, but is significantly faster than manual methods. On average, savings of up to 12 hours are possible.