Heating lifecycle cost comparison under GEG rules: Seasonal performance factor (COP/JAZ), KfW 458 federal subsidies (up to 70% grant), and 10-year operating costs.
Building Energy Act (GEG 65% Renewable Mandate) & Federal Subsidy KfW 458
e.g. 15,000–20,000 kWh for a single-family home
Air-to-water standard: 3.5; ground-source: 4.2
Current gas price incl. CO2 levy (approx. 10–13 ct/kWh)
Discounted heating power rate under § 14a EnWG (approx. 24–28 ct/kWh)
Includes installation & old heater disposal (€25,000–€35,000)
Turnkey condensing gas heater (€9,000–€13,000)
Laufende Betriebskostenersparnis: 1.055 € pro Jahr
KfW grants combine a 30% base grant with bonuses up to a maximum 70% ceiling on €30,000 in eligible costs (providing up to €21,000 in direct government cash rebates).
This calculator is built on deterministic mathematical and algorithmic models. Results are simulations for educational and estimation purposes and should not be used as official or legally binding records.
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