Heat Pump Grants in Luxembourg: Who Qualifies for the Extra €2,000 in 2026?
The temporary €2,000 increase covers eligible ground-source heat pumps and air-to-water heat pumps in existing homes. The order must be dated between 1 January 2026 and 30 June 2027, and the invoice issued no later than 31 December 2028.
-
Temporary increase
-
Extra €2,000
-
Order date
-
By June 30, 2027
-
Invoice deadline
-
December 31, 2028
The law of 24 July 2026 establishes Klimabonus Wunnen 2026. The final grant for an air-to-water heat pump depends on the property, the heating system being replaced and any related work.
The answer in 30 seconds
- For new builds, the technology matters: air-to-water systems do not receive this increase; ground-source systems use the enhanced rate with a reduction when no existing fossil-fuel or electric heating system is replaced.
- The grant for an air-to-water heat pump can reach €12,000 in a single-family home when it replaces an existing fossil-fuel boiler or electric heating system.
- The grant for a ground-source heat pump can reach €14,000 in the same situation.
- Air-to-air air conditioning is not covered by these grant rates.
- The €17,500 maximum applies to one specific scenario combining several bonuses; it is not the standard grant for every project.
Eligibility and the supporting documents determine the grant awarded.
What was actually adopted in July 2026?
The law of 24 July 2026 is now published; the scheme is no longer merely Bill No. 8585. It supports, among other measures, technical installations invoiced from 2026 to 2030. The temporary €2,000 increase for eligible ground-source systems and for air-to-water systems in existing homes has its own order and invoice deadlines.
An extended scheme
Technical installations remain supported until 2030, with fixed grant amounts that do not depend on the system’s output.
A time-limited increase
The determining date is the order date: from January 1, 2026 through June 30, 2027 inclusive.
A later invoice is possible
An installation ordered within this window may be invoiced up to December 31, 2028.
The law is published; use the current supporting documents
Use the 2026 application procedure and forms available on Guichet.lu. Check the required documents before work starts, then retain the order, itemised invoices and proof that initial acceptance has been requested.
Who can receive the additional €2,000?
The increase covers eligible ground-source heat pumps and air-to-water heat pumps in existing residential buildings in Luxembourg. Individuals and certain legal entities may submit an application.
The applicant must be the owner or holder of the required property rights. In a co-ownership, the property manager or an expressly authorised representative acts on the general meeting’s decision.
| Situation | Temporary increase | Decisive factor |
|---|---|---|
| Existing house replacing a fossil-fuel boiler | Yes, if the heat pump meets the criteria | Order placed within the temporary window |
| Existing house with an existing electric heating system | Yes, under the same conditions | Heating system replaced at the same time |
| Existing house without replacement of the specified heating system | The temporary rate applies, but the grant is lower | €4,000 reduction for a single-family home |
| Existing multi-unit residential building | Yes, with an amount per dwelling and a cap per building | Collective application and heating configuration |
| New build: air-to-water | No temporary €2,000 increase | Separate rate: €3,000 for a single-family home; €2,000 per dwelling in a multi-unit building, capped at €10,000 |
| New build: ground-source | Enhanced rate may apply, subject to conditions | €10,000 for a single-family home without replacement of the specified heating: €14,000 minus €4,000 |
| Air conditioning or an air-to-air heat pump | Not under this scheme | Technology not included in the eligible categories |
Keep the dated order confirmation: an estimate or unsigned quotation does not prove the order date.
What are the new heat pump grant amounts for 2026?
The following temporary amounts apply under Article 6 of the law of 24 July 2026 when an existing fossil-fuel boiler or electric heating system is replaced at the same time.
| Heat pump | Existing single-family home | Existing multi-unit residential building |
|---|---|---|
| Air-to-water | €12,000 | €10,000 per dwelling, capped at €30,000 per building |
| Ground-source | €14,000 | €12,000 per dwelling, capped at €60,000 per building |
Without this replacement, the grant for a single-family home is reduced by €4,000: €8,000 for an air-to-water heat pump and €10,000 for a ground-source heat pump.
Does replacing a gas boiler count?
Yes. The text refers to a boiler powered by fossil fuel, which includes both gas and heating oil. It also covers an existing electric heating system.
Can the grant really reach €17,500?
Yes, but only when several conditions are combined in a single-family home heated with oil.
| Item in the official calculation | Maximum amount | Condition |
|---|---|---|
| Base amount for an air-to-water heat pump | €10,000 | Replacement of an existing fossil-fuel or electric heating system |
| Tripartite increase | €2,000 | Order placed by June 30, 2027 |
| Adaptation of the heat distribution system | €2,000 | 50% of actual costs excluding VAT, up to the maximum amount |
| Removal and treatment of the oil tank | €1,500 | Documented work by a specialist company |
| Oil boiler in a drinking-water protection zone | €2,000 | Home located in a zone defined by regulation |
| Maximum total in this example | €17,500 | All conditions must be met |
A gas-heated home with no tank and outside a protection zone cannot use this total. Every calculation must be based on the work actually required. The grant for technical installations, including all bonuses, is capped at the eligible invoiced costs excluding VAT.
Two situations that should not be confused
In an existing single-family home, an eligible air-to-water heat pump replacing gas heating may qualify for the temporary €12,000 rate. The €17,500 total additionally requires an oil tank, the drinking-water protection zone condition and distribution work reaching its grant cap. That combined example therefore does not apply to the gas-heated home.
What technical requirements must be met?
These amounts are conditional on meeting the Klimabonus criteria, which should be checked before choosing the equipment.
Performance and metering
- minimum COP of 3.1 at A7/W35 for an air-to-water heat pump;
- minimum COP of 4.3 under the applicable test conditions for a ground-source heat pump;
- electricity meter for the heat pump’s consumption;
- heat meter and hydraulic balancing.
Hydraulics, noise and initial acceptance
- 30 l/kW buffer tank in certain cases, except where an exemption applies to modulating systems;
- acoustic requirements based on the output of the outdoor unit;
- prior acoustic calculation when the alternative to the 40 dB(A) limit is used;
- initial acceptance request submitted by the installer within one month of commissioning.
For systems commissioned since September 19, 2025, the installer must request initial acceptance from the Chamber of Skilled Trades and Crafts within one month and before the grant application is submitted.
Our article on heat pump inspection in Luxembourg explains the procedure and the documents to retain for the grant application.
The Annex II requirement for a 35°C flow temperature, or equivalent COP at the selected temperature, concerns new buildings. For an existing home, have operation at the temperatures actually required by the radiators, expected consumption and the other eligibility criteria assessed.
What the quotation should specify before you order
- The exact model, output calculated for the building and documented performance; any consumption estimate should state its assumptions.
- Required changes to radiators or the hydraulic circuit, metering, electrical supply and noise mitigation.
- Separate prices for the heat pump, heat distribution work, removal of the old heating system and any oil tank treatment.
- The order, installation, invoice and initial acceptance schedule, and who will provide the supporting documents.
Does an air-to-air heat pump or air conditioning system also receive the extra €2,000?
Not under the grant rates presented here. A reversible air conditioning system is technically an air-to-air heat pump, but the eligible categories under Klimabonus 2026 include ground-source, air-to-water and exhaust-air-to-water systems. They do not include a conventional split air-to-air system.
Do not therefore apply the “extra €2,000” to air conditioning. See our comparison of air-to-air and air-to-water heat pumps.
How do you apply for the grant?
Assess the building
Check heating demand, emitters, flow temperature, electricity supply, noise and location.
Secure eligibility
Choose compliant equipment and keep the dated order confirmation.
Install and arrange initial acceptance
Complete the installation, hydraulic balancing, commissioning and initial acceptance.
Submit the application
Provide the form, technical data sheet, invoices and supporting documents.
The standard procedure takes place after the work through MyGuichet.lu or the dedicated form. The application deadline is four years from December 31 of the invoicing year. You should also check whether municipal authorisation is required.
Should you order now or wait for pre-financing in 2027?
Heat pump pre-financing applies to invoices issued from 1 January 2027. It remains optional and requires an intermediary company listed in the register. The grant plus the deposit paid must not exceed the final sale price excluding VAT. Confirm the company’s participation and the payment schedule in the quotation.
For the project timeline and complementary grants, read our comparison of installing a heat pump in 2026 or waiting until 2027. Certain applications, including enoprimes, must be prepared before signing the quotation.
Ordering in 2026
An eligible project already falls within the window for the extra €2,000. Under the standard route, you pay the grant amount upfront.
Waiting for an invoice in 2027
Pre-financing can reduce the upfront payment if the installer participates. It does not increase the grant.
A deadline should not replace a technical assessment
A heat pump that is poorly suited to the building remains a poor investment, even with an additional €2,000. Radiator compatibility, flow temperature and system sizing must be confirmed before placing the order.
How Ecoclima prepares a heat pump project
At Ecoclima, the assessment starts with the existing heating system and the building, not with the maximum grant.
Understand the home
Heat loss, insulation, domestic hot water, radiators and flow temperature are assessed together.
Compare the scenarios
We separate equipment, hydraulics, electricity, noise, grants and the final out-of-pocket cost.
Prepare the application
The order, technical data sheets, initial acceptance and supporting documents are planned before installation.
You can also read our complete guide to heat pumps in Luxembourg in 2026, which covers renovation, radiators and system sizing.
Calculate the grant for your actual situation
Ecoclima checks the heating system being replaced, the type of heat pump, the adaptations required, the technical criteria and the grants that can actually be included in your application.
Frequently asked questions about the 2026 heat pump grant
Is the additional €2,000 retroactive?
Yes. The adopted text covers eligible heat pumps ordered from January 1, 2026. The order must be dated no later than June 30, 2027, and the invoice no later than December 31, 2028.
Do I have to replace a boiler to receive a grant?
No, but the amount is lower without the simultaneous replacement of an existing fossil-fuel boiler or electric heating system. For a single-family home, the temporary amount is reduced by €4,000.
Is a gas boiler considered fossil-fuel heating?
Yes. Gas is a fossil fuel. Replacing it at the same time with an eligible heat pump allows the replacement rate to be used, provided the other conditions are met.
Does reversible air conditioning receive the extra €2,000?
Not under this scheme. Reversible air conditioning is an air-to-air heat pump, while the Klimabonus categories covered by these amounts notably include air-to-water and ground-source heat pumps.
Do existing radiators prevent me from receiving the grant?
No. However, they must allow the heat pump to operate effectively. Adaptation of the heat distribution system may receive support equal to 50% of actual costs excluding VAT, capped at €2,000 for a single-family home.
Can Klimabonus be combined with a municipal grant?
Some municipalities and programmes offer additional support, but their amounts and rules vary. Check with your municipality, the Klima-Agence simulator and any restrictions on combining grants before finalising the financing.
Does pre-financing in 2027 increase the grant?
No. It changes the payment method, not the amount. For an application accepted through a participating company, the grant is deducted from the final invoice instead of being paid upfront and reimbursed to the customer later.
Are new builds excluded from the additional €2,000?
The technologies must be distinguished. Air-to-water systems in new builds retain their separate rate without the temporary increase. For ground-source systems, Article 6(2) provides the enhanced rate followed by a reduction when the specified heating is not replaced: a new single-family home may therefore qualify for €10,000, subject to the dates and technical criteria.
Official sources
- Legilux: law of 24 July 2026, Article 6 and Annex II
- Luxembourg Government: presentation of Klimabonus Wunnen 2026–2030, July 16, 2026
- Ministry of the Environment: official presentation of the grant amounts and the €17,500 example
- Chamber of Deputies: parliamentary file No. 8585
- Chamber of Deputies: committee report and proposed text, July 13, 2026
- Guichet.lu: Klimabonus grant for technical installations and application procedure
- Klima-Agence: official simulator for national and municipal grants
About the author
Abel Lovasz · Sales Director at Ecoclima
More than seven years of experience in the energy transition, supporting hundreds of customers, including with their solar energy projects.
Explore his background