The calculation and simulation software for heat pump systems

Efficient heat pump design with GeoT*SOL. Download your free 30-day trial now!



Are you looking for a professional and user-friendly software for the planning and design of heat pump systems? Then GeoT*SOL is the ideal tool for you.

GeoT*SOL offers you the choice between different heat sources (soil, air and groundwater), operating modes (monovalent, monoenergetic and bivalent) and numerous system configurations for your location. The program allows for bivalent systems with boiler as heat generator as well as the integration of solar thermal systems and photovoltaic systems.

Based on a dynamic minute simulation, electricity consumption, seasonal performance factors, operating costs and other system data can be calculated, taking into account blocking periods and tariffs. With these parameters, GeoT*SOL helps you to develop efficient and economical heat pump systems. Selected results can be conveniently incorporated into the project report for the client.


Product highlights

More product features

GeoTSOL_climate data_EN

Global climate data available

GeoT*SOL provides you with the latest TMY data of the DWD (current state 2017, averaging period 1995-2012) for Germany and more than 8,000 further climate locations for the whole world based on Meteonorm 8.1. You can use the interactive map to conveniently select the climate data. Locations not included are interpolated using satellite data and neighboring ground measuring stations. The import of your own measurement data takes place via files in DWD, Meteonorm or WBV format.

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Tariffs and blocking periods

Up to three blocking times can be set using the usual rules (intervals and limited duration) in order to be able to precisely depict the supply situation. Furthermore, the electricity price for the heat pump can be divided into high tariff (HT) and low tariff (NT).

GeoTSOL_financial analysis_EN

Profitability analysis

GeoT*SOL calculates the profitability according to the recommendation of the German Solar Association (BSW), taking subsidies into account: Cost comparison of the heat pump system with a reference system; Capital value and production costs (heat price); Modified internal rate of return (MIRR); Profit under consideration of reinvestment.

Configurable project report

Help clients and partners understand the specifics of their heat pump system with appealing reports. The content can range from a short report with seasonal performance factors to a detailed project report with diagrams and system components.

Different project report configurations can be created for different requirements. Changes are immediately displayed in the live preview. The report can be exported as a Word file for further editing or directly as a PDF.

Licensing and pricing


System requirements and releases

System requirements

  • Internet access
  • Processor: Intel i3, AMD Ryzen 3 or higher
  • RAM: 2 GB
  • Free hard disk space: 1,2 GB
  • Resolution display: at least 1024 x 768 pixels, 16 bit
  • Operating systems: Windows 10 (64 bit, latest service pack required), Windows 11 (64 bit)
  • Miscellaneous: Microsoft .Net Framework 4.8 (will be installed automatically)

Release notes

July 20th 2023GeoT*SOL 2023 Release 3

The following new features and changes are included:

  • Database updated.

The following bugs have been fixed:

  • The load profile of the electrical consumptions of the heat pump system was partially not exported completely.
  • Download dialog during software update was not visible.
  • Error when exporting the electrical consumption of the heat pump system if the file to be exported to was open in another program.
June 5th 2023GeoT*SOL 2023 Release 2

The following new features and changes are included:

  • Project report:
    • Live preview of the project report.
    • Create your own configurations of the project report.
    • Project report can be exported as a Word file.
  • Photovoltaic simulation results are displayed in more detail.
  • Heat pump simulation model adapted to DIN EN 14825.
  • MeteoSyn:
    • New climate data for Germany (Valentin Software TMY procedure with DWD data as basis, 1995 – 2012).
    • SolarAnywhere as additional climate data provider.
    • Revised Meteosyn interface in the "Generate climate data for new location" dialog.
    • Improvement of the location search in Meteosyn.
    • Check of the MeteoSyn database in four phases:
      • Checking the files and database entries for invalid data or data with reduced quality.
      • Search for duplicates in WBV files.
      • Search for duplicates in database entries.
      • Search for imports and updates.

The following bugs have been fixed:

  • Negative energies in energy generated and power consumption.
  • Negative tank temperatures.
  • Selection of PV consumers was not saved in the project.
  • Folders without data series were visible in the result graphics.
  • Different data series were partially displayed in the same color in the result graphics.
  • Crash when moving data series in the result graphics.
February 6th 2023GeoT*SOL 2023 Release 1

The following new features and changes are included:

  • The geothermal plant systems can now also be simulated with photovoltaics to determine how much PV energy can be used to cover the electrical loads (heat pump, heating rod, source-side pumps and solar circuit pump).
  • Optimization of PV energy self-consumption by optionally increasing and/or decreasing the storage temperature.
  • Creation of user-defined diagrams in different temporal resolutions. Up to eight data series can be selected in one diagram.
  • The user-defined diagrams can be integrated into the project report.
  • New online help

The following bugs have been fixed:

  • In some cases energy was supplied by the heating rod although it was not needed.
  • Circulation losses were no longer visible after reloading a project.
  • Access violation when loading old projects with storage tank.
  • The heating rod power of the heat pump was sometimes not automatically adopted on the Mode of Operation page.
May 31st 2022GeoT*SOL 2021 Release 3

The following bugs have been fixed:

  • In some storage tanks, sensor heights were incorrect, so that they were not loaded (systems with buffer tanks for heating like HPS 7).
  • In standard storage tanks, the heat exchanger was not scaled when the volume was changed.
  • In the system HPS 8, the boiler delivered an incorrect supply temperature, so that the system ran in continuous DHW operation and the heating system was undersupplied.
January 31st 2022GeoT*SOL 2021 Release 2

The following new features and changes are included:

  • Update of the heat pump and storage database.
  • New climate data:
    • Meteonorm 8.1
    • PVGIS
    • Solcast

The following bugs have been fixed:

  • Error when updating the database.
  • In some storage tanks the collector connection height was wrong.
  • When using large heating buffer tanks, the hot water tank was not loaded correctly in system WPA 8.
  • In the evaluation of the heat pump according to the GEG, the annual performance factor was incorrectly used as a criterion.
  • Due to the mode of operation, the boiler in system WPA 7 did not run in summer.
June 21st 2021GeoT*SOL 2021 Release 1

The following new features and changes are included:

  • Longer pre-processing of the heat pump in parallel operation. As a result, the boiler starts later and the fraction of the heat pump in the generated energy is larger.
  • The window size of the program can be adjusted as desired. At the next start the program will be started with the last used dimensions.
  • The system selection page was updated (filter).
  • The database now includes over 600 tanks from well known manufactures. Tanks can now be configured or be selected from the database.
  • Display of the "Solar Keymark" certification for collectors.
  • Updated climate data based on Meteonorm 7.3.

The following bugs have been fixed:

  • The network license cannot be registered again.