Information about the new nPro version 4.0

General information about version 4.0

• The new nPro version 4.0 will be available from November 17, 2025 at the familiar link https://app.npro.energy.
• All features already available in version 3 are also included in version 4. The only exception is the bill of materials export for networks with multiple pipe models (will be updated in the future). In addition, not all new pipe and building parameters are yet visualizable on the map.
• We will provide additional documentation for the extended calculation approaches (domestic hot water, pipe network design, and diversity factors) soon.
• The academic version of nPro 4.0 will be available from December 6. No older Version 3 is available for academic users. ⚠️ If results from previous projects need to be reproduced exactly for bachelor or master theses, please contact us.

Old version 3 / old projects

• The old nPro version 3 is still accessible at https://v3.npro.energy.
• Use version 3 mainly if you need to exactly reproduce previous calculation results. ℹ️ Version 4 offers many advantages compared to version 3 – please use version 4 whenever possible. ℹ️
• Please do not create new projects in the old version 3, as they will no longer be automatically migrated to version 4.❗
• ⚠️Version 3 is planned to be discontinued in spring 2026.⚠️
• Your projects from the old nPro version 3 have been transferred to version 4. The mapping of model parameters to the new parameters was done with the best possible correspondence, but minor deviations cannot be ruled out. We recommend checking your input parameters when opening old projects for verification.
• In the unlikely event that an old project cannot be opened or calculated, please contact our support team. Despite extensive testing, this cannot be completely ruled out.

Reasons for deviations in calculation results

• Economic calculation: The results on the “energy hub” page have slightly changed. This does not mean that the previous results were incorrect. Example: In annuity calculations, there is a distinction between advance (beginning-of-year) and arrears (end-of-year) calculation. Depending on the approach, slightly different values may occur – both methods are technically correct.
• Economic calculation: Another reason for deviations in profitability are the flat-rate costs that could be defined in Version 3, e.g. for "planning costs", "delivery, installation, commissioning", "measurement and control technology", or "unexpected costs". These were not carried over into Version 4. They can be added manually under "Other costs" as an absolute value.
• Pipe diameters in hot heat networks may be one size larger in certain sections (especially house connections) in version 4, depending on the calculation parameters. This is particularly the case when the domestic hot water buffer tank in buildings is deactivated in version 4 (it was implicitly included in version 3).
• If pipe diameters in cold heat (5GDHC) networks appear larger, the recharge time of the domestic hot water (DHW) buffer tanks should be checked and possibly increased. While a recharge time of around 30 minutes is typically used for hot networks, a longer recharge time (e.g., 60 minutes or more) is recommended for cold networks. This reduces the load of decentralized heat pumps (higher full-load hours) and the pipe diameters.

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