Observed arrival · 2026-10-15
A heat-pump calculator that shows its working
A German-language calculator estimates heat-pump running costs, subsidies and optional solar savings using local weather and solar data.
- For
- Homeowners comparing heat-pump and solar costs
- Worth noticing
- It uses heating-degree days from 397 DWD stations and PVGIS solar-yield data, with linked assumptions and sources.
Field notes
The worked example uses a Fulda home with an older gas heating system and an application date of 15 October 2026: it lists annual gas costs of €2,389, heat-pump costs of €1,962 and a €12,880 grant. The page cautions that average energy prices make the savings small, and points to tariff choice, system performance and whether a replacement boiler is already due as factors that can change the calculation. It labels the result an independent estimate, not energy or subsidy advice.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue