Advice, planning and installation from one source – with 30 to 80% funding after the 2026 BEG reform. Costs, process and answers for Giessen and Central Hesse.
Houses in Giessen, Wetzlar and Marburg are mostly from the sixties to the nineties: radiators, gas or oil boilers, moderate insulation. Exactly the houses in which a heat pump works today – if it is planned properly. We measure instead of guessing, quote a fixed price and advise you honestly on funding.
The year of construction matters less than four technical questions. We answer them on site in about an hour:
Draws heat from the outside air. No earthworks, installed in a few days, suitable for most existing houses.
Geothermal energy via borehole or ground collector. Quieter and more efficient, but more expensive and dependent on the plot.
Heat pump plus existing gas boiler for the coldest days. Pragmatic for poorly insulated houses.
The price includes the unit, buffer tank, hydraulics, removal of the old boiler, electrical connection, hydraulic balancing and commissioning. What moves the price: the heating capacity, radiator changes, the length of the pipe runs and whether a new electricity meter is needed. You get all of it in one fixed-price quote – on request with an estimate of the funding that applies to you.
As of October 2026 · BEG, KfW programme 458 · Rates change regularly – we check them before every quote.
The federal heating funding (BEG, KfW programme 458) was reformed on 21 July 2026: the efficiency bonus was dropped, the income bonus is now staggered and the climate-speed bonus fell from 20 to 16 percent. The basic subsidy applies to everyone, also landlords. Climate and income bonus are for owner-occupiers only.
| Component | Rate | Condition |
|---|---|---|
| Basic subsidy | 30% | Every heat pump, every applicant |
| Climate-speed bonus | 16% | Replacing a working oil, coal or night-storage heating or a gas central heating at least 20 years old; applications until 31 Jan 2027, then −4 points every six months |
| Income bonus | 40 / 30 / 10% | Taxable household income up to €30,000 / €40,000 / €50,000; households with a minor child deduct €10,000 |
| Maximum | 80% | Eligible costs €28,000 for the 1st residential unit (max. subsidy €22,400), +€15,000 for the 2nd–6th, +€8,000 from the 7th |
Good to know: the funding application must be submitted before the work starts; a contract can be concluded subject to funding approval. KfW offers a low-interest supplementary loan for the remaining amount. We are happy to discuss which components apply to you.
We look at radiators, pipework, electricity and the installation site, measure the rooms and calculate the heating capacity your house really needs.
You receive a detailed quote without hidden extras – on request with an estimate of the funding you may qualify for.
You submit the application in the KfW portal – we advise you and provide the technical details. Tip: the contract can be concluded subject to funding approval.
Old boiler out, heat pump, buffer tank and hydraulics in, hydraulic balancing. In the heating season we provide temporary heaters if needed.
Function test, instruction on the controls and all documents – including those you need for the funding payout.
Settle these four questions before you accept any quote. Here are our honest answers – without naming other companies.
Essentially four: the local master-certified heating contractor, online full-service providers, manufacturer partners and energy consultants.
An air-to-water heat pump for a single-family house usually costs €25,000 to €35,000 before funding; a ground-source heat pump with borehole €35,000 to €50,000.
Funding covers 30 to 80% of eligible costs of up to €28,000 for the first dwelling (as of October 2026). Our funding check calculates your own share.
Five points decide whether the heat pump runs efficiently for 20 years:
Three warning signs:
In most cases, yes. What matters is whether the radiators are large enough for flow temperatures of 50–55 °C. We check this with a heat-load calculation; often enlarging one or two radiators is enough. High-temperature heat pumps deliver up to 75 °C if needed.
Current units produce around 30–40 dB(A) at three metres – comparable to a quiet fridge. We plan the installation site so that the limits towards neighbours (35 dB(A) at night in residential areas) are safely met and use sound-insulation hoods where necessary.
Installation takes three to five working days. Including consultation, quote, funding application and delivery, allow six to twelve weeks in total.
First the quote, then the application in the KfW portal, then the installation. A contract can be concluded subject to funding approval. We advise you and provide the technical details; after commissioning you upload the invoice and documentation and KfW pays the subsidy.
For a house with 20,000 kWh of heat demand and a seasonal performance factor of 3.5 you need about 5,700 kWh of electricity per year. With a heat-pump tariff this costs roughly €1,400 to €1,700 – usually less than the previous gas or oil costs.
Yes, many air-to-water heat pumps offer passive or active cooling via underfloor heating or fan convectors. We advise you on whether this makes sense for your house.
Once a year: checking the refrigerant circuit, filters, pressure and settings. We offer maintenance contracts so that the system runs efficiently and the warranty is preserved.
Let's find out together. Contact us for a no-obligation consultation.
