Which heat pump brand should you choose in Luxembourg in 2026?
By Yacine Sahnoune, founder of renov.lu
In Luxembourg, no heat pump brand is required: the Klimabonus grant, €12,000 for an air-to-water unit ordered by 30 June 2027 to replace fossil heating, depends on the model and the installation, not the badge. The model needs a COP of at least 3.1 at A7/W35 and an outdoor sound power of 48 to 55 dB(A) at most, depending on its output.
- No brand is required: the Klimabonus looks at the model and the installation, never the manufacturer
- Eligible model: COP ≥ 3.1 at A7/W35 and ErP sound power ≤ 48, 51 or 55 dB(A) (up to 5 kW, 5 to 12 kW, 12 kW and above), or 40 dB(A) at most at the neighbour’s boundary
- Klimabonus (house): €12,000 for an order placed by 30 June 2027, €10,000 afterwards, if the heat pump replaces fossil or direct electric heating; €4,000 less otherwise
- Refrigerant: from 1 January 2027, no new air-to-water heat pump of 12 kW or less using a refrigerant with a GWP of 150 or more, such as R32, on the EU market; propane (R290) takes over
- Price: €12,000 to €24,000 installed (3% VAT), whatever the brand; the gap between quotes comes from output, emitters and installation
- Gas or oil hybrid: no Klimabonus
Compare brands on your house, not in a catalogue
The renov.lu simulator estimates the installed price and Klimabonus for your heat pump in 2 minutes. Then get 3 quotes from installers established in Luxembourg, each with its brand and exact model.
What the Klimabonus requires from a heat pump, whatever the brand
In Luxembourg, the Klimabonus Wunnen grant does not depend on any brand: it requires an efficient, quiet enough model, a compliant installation and, for the full amount, the replacement of fossil or direct electric heating. These conditions (law of 24 July 2026, guichet.lu) apply to every manufacturer.
| Condition | Requirement for an air-to-water heat pump (house) |
|---|---|
| Efficiency | COP of at least 3.1 at A7/W35 (air 7 °C, water 35 °C), EN 14511 |
| Outdoor-unit noise | ErP-label sound power ≤ 48 dB(A) up to 5 kW, ≤ 51 dB(A) from 5 to 12 kW, ≤ 55 dB(A) from 12 kW (ErP rated output); an acoustic enclosure with a guaranteed reduction in dB(A) can be deducted; otherwise 40 dB(A) at most at the neighbouring buildable plot boundary (schallrechner.lu calculator) |
| Heating circuit | Able to run at a 35 °C flow, hydraulic balancing, electricity meter and heat meter, 30 l/kW buffer tank unless the heat pump modulates |
| Heating replaced | Oil, gas or direct electric: €10,000 (€12,000 for an order placed between 1 January 2026 and 30 June 2027); otherwise €6,000 (€8,000) |
| Commissioning | Acceptance requested from the Chambre des Métiers within one month |
| Type | Air-to-water or ground source; hybrid only if non-fossil, able to run alone and covering at least 70% of the demand; air-to-air excluded |
Eligibility is therefore checked model by model, on the outdoor unit named in the quote: two sizes of the same range can fall under different noise thresholds. Stackable bonuses and the application process: see heat pump grants in Luxembourg.
Hybrid heat pumps combined with a gas or oil boiler, offered by several manufacturers, do not qualify for the Klimabonus. Only a non-fossil hybrid that can run on its own and covers at least 70% of the heat demand is funded.
Air-to-water heat pump brands available in Luxembourg compared (September 2026)
In September 2026, all twelve brands surveyed sell an air-to-water heat pump running on propane (R290), with similar efficiency: a SCOP of 4.5 to 5.2 at 35 °C where published. They differ in noise, from 42 to 59 dB(A) of sound power for 5 to 9 kW, and in their presence in Luxembourg. Four models exceed the 51 dB(A) Klimabonus threshold: they only qualify with an acoustic enclosure with a guaranteed reduction or a calculation showing 40 dB(A) at the neighbour’s boundary.
| Brand | Reference air-to-water model | Refrigerant | SCOP or ηs at 35 °C (at 55 °C) | Outdoor sound power | Max. flow | Manufacturer warranty | Presence in Luxembourg |
|---|---|---|---|---|---|---|---|
| Bosch | Compress 6800i AW, AW 7 OR-S unit, monobloc, 7 kW | R290 | SCOP 4.58 (3.52) | 42 dB(A) ErP (max. 57.7) | 75 °C (60 °C for the 5800i) | Belgium: 5 years if commissioned by Bosch Service | Via Ferroknepper Buderus (Bosch group), Esch-sur-Alzette |
| Buderus | Logatherm WLW186i-7 AR, monobloc, 7 kW | R290 | SCOP 4.58 (3.52) | 42 dB(A) ErP (max. 57.7) | 75 °C | 5 years on system packages (buderus.lu) | Ferroknepper Buderus, Esch-sur-Alzette |
| Daikin | Altherma 4 H EPSK08AV3, hydrosplit, 8 kW | R290 | SCOP 5.15 (3.97) | 45 dB(A) | 75 °C down to −15 °C | 2 years parts and labour (Belgium-Luxembourg), paid extensions | Office in Windhof (Daikin Belux) |
| LG | Therma V R290 HM093HF, monobloc, 9 kW | R290 | SCOP 5.20 (3.86) | 50 dB(A) (standard not stated) | 75 °C | 5 years parts with a service contract, no labour (Benelux) | LG Electronics Benelux (Belgium) |
| Mitsubishi Electric | Ecodan R290 PUZ-WZ80VAA, monobloc, 8 kW | R290 | ηs 176% (140%) | 58 dB(A) | 75 °C down to −15 °C | Belgium: 5 years parts via a partner installer | Belgian subsidiary; approved installers for Belgium-Luxembourg |
| Nibe | S2125-8, monobloc, 5.3 kW rated | R290 | SCOP 5.00 (3.70) | 49 dB(A) | 75 °C | 2 years parts, labour and travel (Benelux) | Nibe Benelux (office in Diegem, Belgium) |
| Panasonic | Aquarea T-CAP M series WH-WXG09ME5, monobloc, 9 kW | R290 | SCOP 5.00 (3.50) | 52 dB(A) (part load) | 75 °C down to −15 °C | Model-dependent (not published for Belgium and Luxembourg) | Belgian website; no subsidiary identified |
| Samsung | EHS Mono R290 AE080CXYDEK, monobloc, 8 kW | R290 | SCOP 4.85 (3.55) | 59 dB(A) | 75 °C | 5 years parts with a service contract (Belgium-Luxembourg distributor) | Belgium-Luxembourg distributor (Ambrava) |
| Stiebel Eltron | WPL-A 07.2 Plus HK 230, monobloc, ≈ 7 kW | R290 | SCOP 5.09 (4.02) | 43 dB(A) | 75 °C | Belgium: 2 years, 5 years under conditions (ISG gateway, service contract) | Belgian subsidiary; sold through Luxembourg wholesalers |
| Vaillant | aroTHERM plus VWL 75/8.1, monobloc, ≈ 7 kW | R290 | SCOP 4.98 (3.62) | 46.8 dB(A) ErP (max. 57.4) | 75 °C | Belgium: 2 + 5 years if registered within 3 months | Belgian subsidiary (Drogenbos); no Luxembourg website |
| Viessmann | Vitocal 250-A 251.A08, monobloc, 6.5 kW | R290 | SCOP 4.5 (3.6) | 48 dB(A) ErP (max. 57) | 70 °C | 5 years in Luxembourg with a ViCare connection | Subsidiary in Steinsel |
| Wolf | CHA-Monoblock CHA-10/400V, 8 kW rated | R290 | ηs 191% (141%) | 53 dB(A) ErP (51 in night mode) | 70 °C | 5 years parts and labour in Luxembourg, under conditions | Partner in Schouweiler |
Figures from manufacturers’ ErP fiches, manuals and product pages, collected in September 2026 for the size shown. « ErP » sound power: the energy-label value (EN 12102) used by the Klimabonus; the « maximum » is a peak operating value. Always check the exact outdoor-unit reference on the quote.
The catalogue SCOP « at 35 °C » is measured in the average climate (EN 14825) with 35 °C water, which suits underfloor heating. With radiators, look at the 55 °C value: in real use, our guide assumes 3.0 to 3.5 with low-temperature radiators and 3.5 to 4.0 with underfloor heating (COP and SCOP explained).
Bosch vs Mitsubishi heat pump, Daikin vs Mitsubishi, Viessmann vs Vaillant: head to head
No match-up has a universal winner: in each one, both manufacturers sell an R290 air-to-water heat pump with similar efficiency; the difference lies in noise, flow temperature in cold weather and service in Luxembourg.
Bosch vs Mitsubishi heat pump: which is better?
The clearest difference is noise: the Bosch AW 7 OR-S unit (Compress 6800i AW, 7 kW) has an ErP sound power of 42 dB(A), the Mitsubishi Electric Ecodan R290 PUZ-WZ80VAA (8 kW) 58 dB(A), both measured at A7/W55. The Bosch is below the 51 dB(A) Klimabonus threshold; the Mitsubishi must show 40 dB(A) at the neighbour’s boundary or get an enclosure with a guaranteed reduction. In cold weather, the Mitsubishi holds up better: 75 °C down to −15 °C, against 65 °C at −10 °C for the Bosch.
| Criterion | Bosch Compress 6800i AW | Mitsubishi Electric Ecodan R290 |
|---|---|---|
| Unit, refrigerant | AW 7 OR-S, R290, 7 kW | PUZ-WZ80VAA, R290, 8 kW |
| ηs 35 °C / 55 °C | 180% / 138% | 176% / 140% |
| ErP sound power | 42 dB(A) | 58 dB(A) |
| Max. flow | 75 °C, 65 °C at −10 °C | 75 °C down to −15 °C, 65 °C at −25 °C |
| Operating limit | Stops at about −22 °C | −25 °C |
| In Luxembourg | Via Ferroknepper Buderus (Bosch group) | Belgian subsidiary, approved installers for Belgium-Luxembourg |
On a small plot, the Bosch, or its Buderus Logatherm WLW186i AR twin with identical ErP values, makes the noise paperwork easier; with old radiators, the Mitsubishi keeps 75 °C for longer. Its Zubadan range for very cold weather (PUZ-SHWM80VAA split: 8 kW held at −10 °C, 60 °C flow) uses R32: it can no longer be placed on the market new from 1 January 2027.
Daikin vs Mitsubishi Electric
The Daikin Altherma 4 H (EPSK08AV3, 8 kW) is a « hydrosplit »: the propane stays outside and the unit is linked to the indoor module by water. It shows a SCOP of 5.15, 45 dB(A) and 75 °C down to −15 °C, against ηs 176% and 58 dB(A) for the Ecodan R290 monobloc. Daikin has an office in Luxembourg (Windhof); Mitsubishi Electric works through its Belgian subsidiary.
Viessmann vs Vaillant
The Vitocal 250-A A08 (6.5 kW) shows a SCOP of 4.5 and 48 dB(A), the aroTHERM plus 75/8.1 (≈ 7 kW) a SCOP of 4.98 and 46.8 dB(A): both below the 51 dB(A) threshold. The Vaillant reaches 75 °C and heats down to −25 °C, the Viessmann delivers 70 °C down to −10 °C. In Luxembourg, Viessmann has a subsidiary in Steinsel and a written 5-year warranty for the country; we found no Luxembourg subsidiary or warranty for Vaillant.
Unit sound power and 40 dB(A) at the neighbour: two different measurements
The sound power on a data sheet (LWA) measures the noise emitted by the outdoor unit; the 40 dB(A) of the model municipal regulation is a level received at the boundary of the neighbouring buildable plot. The second depends on the first, on distance and on walls that reflect the sound.
The model building regulation (circular no. 2023-119) sets 40 dB(A) (LAeq over one hour) at the boundary of the nearest buildable neighbouring plot, +5 dB(A) for clearly tonal noise, and places the unit at least 2.00 m from the boundary, unless an expert certifies compliance. It only applies in municipalities that have adopted it.
| Sound power | Distance to boundary | Position | Estimated level at boundary |
|---|---|---|---|
| 48 dB(A) | 3 m | Against a wall | ≈ 33 dB(A): compliant |
| 51 dB(A) | 2 m | In a corner | ≈ 43 dB(A): too high |
| 55 dB(A) | 5 m | Against a wall | ≈ 36 dB(A): compliant |
| 55 dB(A) | 3 m | In a corner | ≈ 43 dB(A): too high |
renov.lu free-field estimate: sound power − 20 × log10(distance in m) − 11, plus 3 dB (free-standing), 6 dB (against a wall) or 9 dB (in a corner). For the Klimabonus and the municipality, the check is made with the official schallrechner.lu calculator from the Ministry of the Environment, using the model’s ErP sound power.
On a small plot or in a semi-detached house, position matters as much as the brand. Night mode lowers noise by limiting fan and compressor speed, and therefore output too. Municipal permits and co-ownership: see heat pump regulations in Luxembourg.
R290 or R32: what Regulation (EU) 2024/573 changes
From 1 January 2027, the EU F-gas Regulation (EU) 2024/573 bans placing on the market new air-to-water heat pumps of 12 kW or less, monobloc or split, whose refrigerant has a global warming potential (GWP) of 150 or more. R32, well above that threshold, leaves these ranges; propane (R290), which is not a fluorinated gas, becomes the standard.
| Equipment | Placing on the market banned (unless site safety requires it) | Date |
|---|---|---|
| Monobloc up to 50 kW | F-gas with GWP ≥ 150 | 1 January 2027 |
| Air-to-water split of 12 kW or less | F-gas with GWP ≥ 150 | 1 January 2027 |
| Monobloc of 12 kW or less | Any F-gas | 1 January 2032 |
| Split of 12 kW or less | Any F-gas | 1 January 2035 |
| Split above 12 kW | GWP ≥ 750, then GWP ≥ 150 | 1 January 2029, then 2033 |
- An R32 heat pump already installed stays usable and repairable: the servicing ban only covers virgin refrigerants with a GWP of 2,500 or more, and spare parts remain allowed.
- R290 is flammable: each manual sets a protection zone around the unit, free of building openings, light wells and drains, to be checked on the plan before ordering.
- Monobloc or split: a monobloc arrives with a sealed, pre-charged refrigerant circuit; a split with a fluorinated refrigerant needs an F-gas certified company.
How to choose your heat pump: six weighted criteria
To decide between two offers, our grid weights local service at 30%, output and flow temperature at 25%, noise and efficiency at 15% each, the refrigerant at 10% and the warranty at 5%. The brand only counts through these criteria.
Installer and after-sales service (30%)
Ask how many units of this model the installer has fitted, who handles breakdowns, how fast, and where the parts are. A well-supported brand near you beats a higher SCOP with no trained technician.
Output and flow temperature (25%)
The model must deliver the calculated output in cold weather at your radiators’ water temperature. Insist on a heat loss calculation to EN 12831: see heat pump sizing.
Noise and position (15%)
ErP sound power below the Klimabonus threshold for the chosen size, or a schallrechner.lu calculation made with the real position.
Efficiency at your temperature (15%)
SCOP at 55 °C with radiators, at 35 °C with underfloor heating. For 18,000 kWh of heat a year, moving from a SCOP of 3.0 to 3.5 saves about 860 kWh: see heat pump electricity consumption.
Refrigerant (10%)
R290 for a new air-to-water heat pump of 12 kW or less; an R32 model bought in 2026 remains legal and repairable.
Warranty and controls (5%)
Warranty length and conditions, remote control, compatibility with a home energy management system (HEMS: €500 grant for invoices from 1 October 2026).
Mistakes to avoid when choosing a heat pump brand
Most disappointments come from poor sizing or installation, not from the brand.
- Choosing the brand before the installer: a badly set-up unit uses more power than a lower-rated model installed with care.
- Comparing COPs at A7/W35: this point is used for the Klimabonus threshold; for your bill, compare the SCOP at your flow temperature.
- Mixing up decibels: 55 dB(A) of sound power does not mean 55 dB(A) next door.
- Accepting an « or equivalent » quote: Klima-Agence asks for the exact manufacturer and model, with no « comparable » or « subject to availability ».
- Signing for a gas or oil hybrid while counting on the Klimabonus.
- Oversizing « to be safe »: the heat pump costs more and runs in short cycles, which lowers its efficiency.
- Forgetting the Chambre des Métiers acceptance, required for the Klimabonus.
Klima-Agence recommends a contractual agreement on a minimum seasonal performance factor. The heat and electricity meters required for the Klimabonus let you check it after the first winter. What a complete quote contains: see the heat pump quote page.
Compare brands on your own project
Ask for 2 or 3 quotes stating the exact model, the calculated output, the ErP sound power and the flow temperature, then compare them with the table above. The installed price stays within the range on the heat pump cost page (€12,000 to €24,000 for air-to-water), whatever the brand.
From comparison to quotes
An instant estimate of the price and Klimabonus, then 3 quotes from installers established in Luxembourg, with brand and model stated.
Frequently asked questions about heat pump brands
Which heat pump brand is best in Luxembourg?
None is best in every case. In September 2026, all twelve brands in our comparison sell an R290 air-to-water heat pump with similar efficiency (a SCOP of 4.5 to 5.2 at 35 °C where published); they differ in noise, from 42 to 59 dB(A), and in their service in Luxembourg. The best one for you meets the Klimabonus noise threshold, delivers the flow temperature your radiators need and is serviced by a nearby installer.
Bosch or Mitsubishi heat pump: which is better?
It depends on your house. At a similar size, the Bosch Compress 6800i AW (7 kW, R290) is much quieter: an ErP sound power of 42 dB(A) against 58 dB(A) for the Mitsubishi Electric Ecodan R290 (8 kW), which puts it below the 51 dB(A) Klimabonus threshold. The Mitsubishi keeps a 75 °C flow down to −15 °C, against 65 °C at −10 °C for the Bosch: an advantage with old radiators.
Does the Klimabonus require a list of approved brands or models?
No. The conditions published on guichet.lu concern the performance of the installed model, never the brand: a COP of at least 3.1 at A7/W35 (EN 14511) and an outdoor-unit ErP sound power of 48, 51 or 55 dB(A) at most depending on output, or 40 dB(A) at the neighbour’s boundary. The installer enters these values in the POCH-2026 technical form: keep the manufacturer data sheet for the exact model installed.
Is a 55 dB(A) heat pump too loud for the neighbours?
Not necessarily: 55 dB(A) is the sound power emitted by the unit, not the noise received next door. Against a wall 5 m from the boundary, it gives about 36 dB(A) at the boundary, below the 40 dB(A) of the model municipal regulation; in a corner 3 m away, about 43 dB(A). For the Klimabonus, 55 dB(A) is only accepted as such from 12 kW; below that, you must show 40 dB(A) with schallrechner.lu.
Will an R32 heat pump bought in 2026 still be repairable after 2027?
Yes. From 1 January 2027, Regulation (EU) 2024/573 bans placing on the market new air-to-water heat pumps of 12 kW or less with a refrigerant GWP of 150 or more, not the use of units already installed. Servicing and recharging with R32 remain allowed, as the servicing ban only covers virgin refrigerants with a GWP of 2,500 or more, and selling repair parts remains permitted.
Monobloc or split: which type of air-to-water heat pump should you choose in 2026?
A monobloc is the simplest choice: the whole refrigerant circuit, usually with R290, stays in the outdoor unit, connected to the house by water pipes that must be protected from frost. A split keeps the water indoors, but a split with a fluorinated refrigerant needs an F-gas certified company and, from 1 January 2027, new air-to-water splits of 12 kW or less must use a refrigerant with a GWP below 150.
Does a heat pump warranty depend on the installer?
Often, yes: long warranties are conditional. Viessmann gives 5 years in Luxembourg if the system, commissioned by a heating engineer, stays connected to ViCare; Wolf gives 5 years parts and labour with registration and an annual inspection; in Belgium, Bosch extends its warranty to 5 years if Bosch Service commissions the unit. Have the quote state the length, the parts and labour covered, and who provides service in Luxembourg.