2026 is the year of the heat pump in Germany – subsidies are more attractive than ever, the technology has become more reliable, and running costs keep falling. If you replace your old heating system in 2026, you can benefit from up to 70% state funding, modern heat pump technology and 40–60% lower energy input compared to gas. But be careful: not every heat pump suits every house. This guide covers the funding options, the cost calculation and how to choose the right type for your building.
Current Subsidies 2026 – BAFA, KfW and Regional Programmes
BAFA funding (German Federal Office for Economic Affairs and Export Control):
- Individual measure: replacing an old heating system with a heat pump = 30% grant on purchase + installation, with bonuses stacking up to 70% in the best case
- Optimisation bonus: extra funding if you renew insulation or windows at the same time
- Apply on time: the application must be submitted BEFORE signing the purchase contract – only buy after approval!
KfW loans (German development bank):
- Repayment grants for efficiency-house standards
- Favourable loan interest rates depending on efficiency class
- Can be combined with BAFA funding
Regional programmes (per federal state):
- North Rhine-Westphalia: additional state funds for certain regions
- Bavaria: heat pump bonus up to €5,000 for households below certain income levels
- Baden-Württemberg: climate protection programme with loans and grants
- Check your federal state – double funding (BAFA + state) is often possible, and some municipalities add €500–2,000 on top
Funding checklist:
- Calculate your building's heat loss (energy certificate or U-value analysis)
- Size the heat pump (kW output)
- Submit the BAFA application before placing the order
- After approval: choose an installer and place the order
- After installation: submit the invoice – the grant is typically paid out within a few weeks
Comparison: Air, Water and Ground Source Heat Pumps
Air-to-water heat pumps:
- How they work: outside air is drawn in, heat is extracted via the compressor and transferred to the heating water
- Costs: €8,000–15,000 (unit), €2,000–4,000 installation = €10,000–19,000 total
- Efficiency: COP 3.5–4.5 (1 kWh of electricity = 3.5–4.5 kWh of heat)
- Advantage: easy to install, no drilling or excavation, fastest payback
- Disadvantage: output drops at very low outdoor temperatures (below −15 °C), then electric backup heating is needed
- Best for: well-insulated single-family homes with space for the outdoor unit
- Popular models: Daikin Altherma, Mitsubishi Ecodan, Bosch Compress, Viessmann Vitocal
Water-source (groundwater) heat pumps:
- How they work: groundwater from a well is used as a constant ~10 °C heat source all year round
- Costs: €12,000–18,000 unit, €6,000–12,000 well drilling = €18,000–30,000 total
- Efficiency: COP 4.5–5.5
- Advantage: consistently high efficiency, works reliably even at −20 °C outside
- Disadvantage: expensive installation, drilling permit required, groundwater quality must be suitable
- Best for: larger houses, long-term investment, very cold regions
Ground-source (brine) heat pumps:
- How they work: brine circulates in boreholes of 100+ metres, continuously extracting geothermal heat
- Costs: €15,000–20,000 unit, €10,000–20,000 drilling = €25,000–40,000 total
- Efficiency: COP 5.0–6.0 (the best available!)
- Advantage: highest year-round efficiency, independent of outdoor temperature
- Disadvantage: highest purchase cost, long payback (12–15 years), invasive drilling
- Best for: new builds with a larger budget, very cold regions, maximum longevity
Quick comparison:
| Aspect | Air | Water | Ground |
|---|---|---|---|
| Purchase | €€ | €€€ | €€€€ |
| Installation | Fast | Medium (well) | Long (deep drilling) |
| Efficiency (COP) | 3.5–4.5 | 4.5–5.5 | 5.0–6.0 |
| Sub-zero performance | Weak (<−15 °C) | Good | Good |
| Payback | 8–10 years | 10–12 years | 12–15 years |
| Permits | None (usually) | Drilling permit | Drilling permit |
| Recommendation | 80% of single-family homes | Large houses, cold regions | New builds, extra budget |
Cost Calculation and Payback
A realistic example for a 150 m² single-family home:
Starting point: 25-year-old gas heating, current heating costs €1,800/year, annual heat demand 22,500 kWh.
Scenario: air-source heat pump with maximum BAFA funding
| Item | Cost |
|---|---|
| Heat pump unit (e.g. Bosch Compress) | €12,000 |
| Installation (pipework, electrician) | €3,500 |
| Adapting the existing heating system | €2,000 |
| Total cost | €17,500 |
| Your share after 70% funding | €5,250 |
Annual running costs with the heat pump: annual electricity demand = 22,500 kWh ÷ 4.0 COP = 5,625 kWh. At current electricity prices this is roughly comparable to gas in absolute terms – the saving comes from the efficiency advantage, not from cheaper energy. A realistic saving versus an old gas boiler is 20–30% (€1,800 → approx. €1,400/year = €400 saved per year).
Payback: €5,250 own investment ÷ €400 annual saving = approx. 13 years. With additional building renovation (windows, insulation) and a KfW repayment grant, this shortens to 8–10 years.
Extra tip: switching to a special heat pump electricity tariff (often €0.25–0.30/kWh) cuts running costs by a further ~20%.
Sizing the Heat Pump Correctly
Calculate the heat load: most older buildings need 10–15 kW of heat output; well-insulated new builds only 6–8 kW. An undersized heat pump never keeps up; an oversized one is uneconomical.
- Check the consumption of your old heating: your gas or oil bill shows the kWh
- Or read your energy certificate: it states the annual heating demand in kWh/a
- Sizing factor: approx. 0.9 × the output of your old gas boiler is a good starting point (heat pumps run more efficiently)
Example: old gas boiler 20 kW → recommended heat pump approx. 18 kW.
Popular Manufacturers and Models 2026
Daikin Altherma 3 (split heat pump)
- COP: 4.2–4.8 · Output: 4–16 kW · Price: €10,000–14,000
- Strengths: modulating, quiet, good efficiency even at −15 °C
Mitsubishi Ecodan (split heat pump)
- COP: 4.0–4.6 · Output: 5–14 kW · Price: €9,500–13,500
- Strengths: robust, reliable, good spare parts availability
Bosch Compress (split & monobloc)
- COP: 3.8–4.4 · Output: 2–16 kW · Price: €8,000–12,000
- Strengths: German brand quality, broad portfolio, good system integration
Viessmann Vitocal (premium segment)
- COP: 4.3–5.0 · Output: 6–18 kW · Price: €12,000–16,000
- Strengths: top efficiency, smart home integration, long service life
Browse all models and current prices here: Heat Pumps at jacobwarm.com
Maintenance and Service Life
A modern heat pump runs reliably for 20–25 years if:
- Installation is done professionally (certified heating installer)
- It is serviced every 2 years (refrigerant check, system inspection)
- Filters are kept clean
Annual maintenance cost: approx. €150–250 – considerably less than old oil or gas boilers.
Common Heat Pump Buying Mistakes
- Undersizing to save money → constant full load, higher electricity costs
- Not checking old radiators → heating surfaces too small, the heat pump cannot work efficiently
- Forgetting the subsidy → missing out on up to 70% funding (happens to many!)
- Choosing the cheapest installer → design errors and poor efficiency
- Not optimising the electricity tariff → a dedicated heat pump tariff saves ~20% in running costs
Verdict: 2026 Is the Right Time
- Funding: up to 70% in grants (BAFA + KfW) – a huge incentive
- Technology: air-source heat pumps have become reliable and efficient
- Payback: 8–12 years with funding and savings
- Sustainability: lower emissions, less dependence on gas
Next Steps
- Get your energy certificate or dig out your old heating bills
- Prepare the BAFA application (before obtaining installer quotes)
- Find a certified installer (qualified for KfW + BAFA projects)
- Get quotes – we are happy to help you choose the right heat pump: office@jacobwarm.com or +49 (0) 2274 90398 40
