EXISTING BUILDINGS · DIN/TS 12831-1
Heat load, emitters & hydraulic balancing. Simple. Fast. Standards-compliant.
The smart platform that gets homeowners and HVAC pros to the goal without detours. Calculate the heat load of your existing building with the official simplified method of DIN TS 12831-1, size the right emitters, and complete hydraulic balancing in just a few minutes. The app even checks whether the chosen heat pump fits the building heat load — straightforward, to the point, and practical. We deliberately skip the theoretical ballast of huge new-build software suites and focus on what really matters in existing stock: as much precision as needed, as simple as possible.
That gives you the best of both worlds. As a homeowner you finally get full transparency for your building, can recalculate your heating yourself, and enter the conversation with your contractor on equal footing — permanently 100% free. As an HVAC pro or energy advisor you save valuable office time, use lean modern software without expensive legacy licences, and reach standards-compliant, subsidy-ready, legally sound results in record time when replacing heating systems in existing buildings. No endless menus, no misunderstandings — fast decisions and maximum efficiency for both sides.
What thermoNavi can do today
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Find thermal bottlenecks
Often a single radiator sets the flow temperature for the whole system — like 55 °C flow when 45 °C would suffice. thermoNavi analyses each room, finds the bottleneck and shows whether a targeted replacement can improve overall heat pump efficiency.
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Data foundation for hydraulic balancing
Instead of guesswork in older buildings, thermoNavi calculates the volume flows each radiator needs. That provides the physical basis for commissioning — and fits the vision of an end-to-end planning process around heat pump retrofits.
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Structured PDF documentation
After entering your data, thermoNavi produces a clear summary of all calculations. Homeowners get an understandable record; contractors get fast, reliable documentation for customer meetings and service work.
In the final stages of development.
We are currently finishing the app to make calculations in the plant room as straightforward as possible. Release is expected in a few weeks.
Not a substitute for professional advice or regulatory proofs. Savings depend on the building and starting conditions.