Heat-pump costs 2026: what drives the bill – without invented price ranges

Short answer: An official euro range for a heat pump plus installation does not appear on the KfW, BAFA, BMWE or gesetze-im-internet pages fetched on 18 August 2026. This tip therefore states no “typical” 14,000- or 35,000-euro packages. What can be evidenced: KfW calculates the grant on eligible total costs with a cap of 28,000 euros for the first dwelling (15,000 euros each for the second to sixth, 8,000 euros each thereafter). The grant itself is a percentage of that assessment, not the market price. The BMWE FAQ works an example of 22,000 euros of eligible costs → a 15,400-euro grant at 30 + 40 percent.

What actually makes the invoice large or small is the heat source, the heat load, hydraulics, the electrical connection, strip-out and permits – not an invented catalogue price. The grant itself is explained in Heat-pump funding. Whether you must replace the system: Heat pump, GEG and replacement. Overview: Heat pump.

No official range – and why that matters

Search results, and the live topic, list appliance prices. On the official pages this draft fetched, the figures are:

Anyone who needs a “air-to-water 14,000–22,000 euros” figure will find it on the hub as an empirical value – not on an official page from 18 August 2026. That is why it is absent here.

What drives the bill

The BEG EM guideline and KfW sheet 458 show which line items can enter eligible total costs and which the technology forces:

1. Heat source. Electrically driven air-to-water, brine-to-water and water-to-water units can be funded if they are on the BAFA appliance list. Gas heat pumps and units that use room air as the source are ineligible (TMA 3.4). Brine with a new borehole requires a drilling firm certified to DVGW W 120-2 and no-fault borehole insurance – cost blocks an air-to-water unit does not have. A water-law permit and a laboratory analysis for groundwater sit in regulatory law, not as a euro rate in the BEG.
2. Heat load and flow temperature. The TMA require a design seasonal performance factor of at least 3.0 (VDI 4650 Part 1: 2019-03) and ηs efficiency values under Ecodesign. An uninsulated house with high flow temperatures forces more capacity and often underfloor heating or low-temperature radiators. The guideline treats those accompanying measures as eligible under heating optimisation – it does not give a unit price.
3. Hydraulic balancing. Without documented balancing (method B, VdZ form) KfW does not pay. That is a mandatory component, not an optional extra rate.
4. Electricity, control, metering. New heat pumps need a digital interface for grid-oriented control under EnWG § 14a and, after commissioning, an order for an intelligent metering system if one is not already installed. From 1 July 2027 the interface must follow an EU code-of-conduct format. Those are connection and meter costs, not appliance advertising.
5. Noise and siting. Air-to-water is funded only if the outdoor unit is at least 10 dB below the EU limit in Regulation 813/2013. Distance and noise protection can force the siting – and therefore a plinth, scaffolding or a quieter range – without the guideline naming a euro rate.
6. Strip-out of the old system. The district chimney sweep signs off decommissioning (GModG § 97 as a task norm). Oil-tank cleaning and disposal are typical accompanying costs. On a breakdown the BEG funds hire of a temporary heater for at most one year from the application; operation and energy for that hire are not eligible.
7. Own labour. Only materials are eligible, and only with confirmation of proper execution. The owner’s working time is not in the assessment.
8. Not eligible, but often on the invoice: maintenance contracts, the electricity tariff, upkeep, used parts, prototypes.

How the invoice becomes a grant

The path is in Heat-pump funding and is repeated here only so far as it explains the euro cap:

• Assessment = eligible total costs, capped at 28,000 / 15,000 / 8,000 euros depending on the dwelling.
• Rate = 30 percent plus – owner-occupiers only – 16 percent climate speed (falling from 1 February 2027) plus the 40 / 30 / 10 percent income bonus, in total at most 70 or 80 percent.
• The 28,000-euro cap for the first dwelling falls by 750 euros every six months from 1 February 2027.
• Alternative without KfW: Income Tax Act § 35c, 20 percent over three years, at most 40,000 euros of tax reduction, not beside the grant.
• Financing the own contribution: top-up loan 358/359 up to 120,000 euros per dwelling, only after grant approval. The fetched product page does not publish a 2026 interest rate.

Without a BzA, without a conditional contract and without an application before the project starts, the grant is zero, whatever the invoice says.

What to settle before the quote

1. Which source is lawful on your plot and on the BAFA list?
2. What heat load and flow temperature does the contractor calculate – and what SPF results under VDI 4650?
3. Which lines are appliance, accompanying work, electrics, strip-out, permit – separate, not one lump sum?
4. Is the suspensive or resolutory condition in the contract before you click at KfW?
5. Owner-occupation and taxable income for 2023/2024 (for an application in 2026) – that decides whether 30, 46, 56, 70 or 80 percent is even reachable. The invoice alone does not.

There has been no replacement duty since 29 July 2026. Details: Heat pump, GEG and replacement.

What this tip is not

Not a price comparison, not a payback calculation, not a 2026 electricity price. The topic Heat pump may show empirical values; this tip does not, because they are missing from the official pages fetched.