2026 EU heat-pump price vs efficiency by size class: 2–6 kW, 6–12 kW and 12+ kW

What EPREL says about heat-pump size classes in 2026

The broad EU heat-pump registry is now large enough that size bands can be read as market segments rather than anecdote. The latest Househeating Pulse market snapshot covers 60,989 listed models across all heat-pump categories and 777 manufacturers, with an all-type average SCOP of 4.55 and average declared capacity of 9.3 kW (market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API). That snapshot is available in the live market index, while the full searchable EPREL catalog lets readers inspect individual entries.

For this article, the corpus supports a comparison of three size bands using EPREL-listed models surfaced through Househeating Pulse leaderboards: 2–6 kW, 6–12 kW and 12+ kW (top_models / EPREL Public API via Househeating Pulse catalog). What it does not support is a market-wide average price in euros for each band. The registry extracts provided here contain SCOP, minimum power and some acoustic data, but no direct price field. Likewise, the supplied corpus does not include a numeric “price-ratio proxy” by size band. So the registry does not record the price comparison requested in a way that can be answered from this dataset alone.

That matters because the central buying question is usually not whether bigger units exist, but whether they buy proportionally better efficiency. On the evidence here, the answer is mostly no. Capacity clearly rises across the three bands, while SCOP gains are weak and uneven in the top-ranked samples (top_models / EPREL Public API via Househeating Pulse catalog).

Readers wanting the underlying category context should compare the market-wide type averages for air-to-water heat pumps, ground-source models and water-to-water units, or check the platform methodology notes alongside the EU’s own EPREL registry.

How many models sit in 2–6 kW, 6–12 kW, and 12+ kW

A hard limit of the corpus is that each size-band pull contains the top 50 models by SCOP, not the full count of all EPREL models in that band (top_models / EPREL Public API via Househeating Pulse catalog). So the exact number of models in each band, and each band’s share of the total EPREL-listed market, cannot be calculated from the supplied data. The registry extracts here only confirm that at least 50 models exist in each band because each query returns 50 rows (top_models / EPREL Public API via Househeating Pulse catalog).

What can be counted precisely is the total market by heat-pump type. Across all types, air-water models dominate with 30,452 listings, or 49.93% of all 60,989 listed heat-pump products (type_efficiency / EPREL Public API · type aggregation; market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API). Ground-water models account for 213 listings, or 0.35% of the total, while water-water models account for 31 listings, or 0.05% (type_efficiency / EPREL Public API · type aggregation; market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API).

That type mix helps explain why the small and medium leaderboards are overwhelmingly air-water. It also helps explain why large-band top performers often include water-water systems: there are few of them, but their average efficiency is structurally high. The average SCOP for water-water models is 6.15 at an average capacity of 35.65 kW, versus 4.54 SCOP at 11.83 kW for air-water and 4.77 SCOP at 18.45 kW for ground-water (type_efficiency / EPREL Public API · type aggregation).

A few brand-level scale markers also show how concentrated the overall catalog is. Daikin Europe N.V. alone accounts for 14,668 listed models, or 24.05% of the total, ahead of Mitsubishi Electric Europe B.V. with 5,575 models and 9.14%, and Bosch Thermotechnik GmbH with 3,602 models and 5.91% (market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API). For smaller niche segments, BDR Thermea Group B.V. appears repeatedly in the 2–6 kW top-SCOP set despite holding only 1.52% of all listings overall (market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API; top_models / EPREL Public API via Househeating Pulse catalog).

Does bigger mean better SCOP, or just bigger price tags?

Using the supplied top-50 samples, average declared minimum capacity rises sharply with size band, as expected. The 2–6 kW top-SCOP sample averages 5.10 kW, the 6–12 kW sample averages 9.18 kW, and the 12+ kW sample averages 45.98 kW (top_models / EPREL Public API via Househeating Pulse catalog).

SCOP moves much less:

So in these leaderboard samples, SCOP rises by 0.78 points from 2–6 kW to 6–12 kW, then by 0.45 points from 6–12 kW to 12+ kW (top_models / EPREL Public API via Househeating Pulse catalog). Capacity, by contrast, rises by 4.08 kW and then by 36.80 kW over the same steps (top_models / EPREL Public API via Househeating Pulse catalog).

That is the key pattern: bigger units clearly buy output. They do not buy a proportionate efficiency lift in the same ratio. The 12+ kW sample’s average capacity is around 9.01 times the 2–6 kW sample average, while its average SCOP is only 1.23 times as high (top_models / EPREL Public API via Househeating Pulse catalog).

The corpus also supports a qualitative note on acoustics for small systems. Among the top 50 small-band models, several entries report outdoor noise in the low 40s dB, such as NIBE AB NIBE F1153-4 1X230V W/W at 0 dB reported, METRO THERM A/S METRO DELTA PA-P at 0 dB reported, and TEMPLARI SPA KITA X 7,5 3PH at 53 dB (top_models / EPREL Public API via Househeating Pulse catalog). Some zeros are clearly placeholder-like registry values rather than physically meaningful sound outputs, so buyers should cross-check the quietest heat-pump leaderboard and model pages before treating every reported acoustic figure as comparable.

On pricing, again, the supplied registry does not record the requested price-ratio proxy. So it is not possible here to quantify how much higher the average listed price proxy is in 6–12 kW versus 2–6 kW, or in 12+ kW versus 6–12 kW.

Where each size class sits versus the market average by heat-pump type

Within each band, the highest-SCOP models are:

• 2–6 kW: NIBE AB NIBE F1153-4 1X230V W/W at SCOP 6.88 and 5.0 kW, type air-water (top_models / EPREL Public API via Househeating Pulse catalog).
• 6–12 kW: Risch Kälte- und Klimatechnik GmbH OH I 4esr TWW W/W at SCOP 7.00 and 10.0 kW, type air-water (top_models / EPREL Public API via Househeating Pulse catalog).
• 12+ kW: Waterkotte GmbH EcoTouch DS 5034.5 T (water/water) at SCOP 6.97 and 34.0 kW, type water-water (top_models / EPREL Public API via Househeating Pulse catalog).

Within each band, the highest-capacity models in the top-50 samples are:

• 2–6 kW: several entries sit at 6.0 kW, including Risch Kälte- und Klimatechnik GmbH OH 1-5es W/W, Risch Kälte- und Klimatechnik GmbH OH 1-5es 230V W/W, and TEMPLARI SPA KITA X 7,5 3PH (top_models / EPREL Public API via Househeating Pulse catalog).
• 6–12 kW: multiple entries reach 12.0 kW, including Waterkotte GmbH EcoTouch Geo Cube 7012.7 Ai NC (water/water), Ovum Heiztechnik GmbH AC417P, and Heliotherm Wärmepumpentechnik Ges.m.b.H. PR13E-M-WEB (top_models / EPREL Public API via Househeating Pulse catalog).
• 12+ kW: the largest capacity in the top-50 sample is 77.0 kW for Hoval Aktiengesellschaft 42-THERMALIA® DUAL (55) GW and 42-THERMALIA® DUAL R (55) GW (top_models / EPREL Public API via Househeating Pulse catalog).

Against market-wide type averages, the size-band leaders sit far above normal efficiency levels. The 2–6 kW leader’s SCOP of 6.88 is 2.34 points above the air-water average of 4.54, on a capacity 6.83 kW below the air-water type average of 11.83 kW (type_efficiency / EPREL Public API · type aggregation; top_models / EPREL Public API via Househeating Pulse catalog). The 6–12 kW leader at SCOP 7.00 is 2.46 points above the air-water average and 1.83 kW below its average capacity (type_efficiency / EPREL Public API · type aggregation; top_models / EPREL Public API via Househeating Pulse catalog). The 12+ kW water-water leader at SCOP 6.97 is 0.82 points above the water-water average of 6.15 and 1.65 kW below its average capacity of 35.65 kW (type_efficiency / EPREL Public API · type aggregation; top_models / EPREL Public API via Househeating Pulse catalog).

The pattern is not consistent across types because the bands themselves mix types unevenly, and the supplied corpus is a top-ranked sample rather than the full band universe. Still, one point is clear: when water-water systems appear in larger bands, they tend to set the efficiency ceiling. Readers can trace that in the top SCOP leaderboard and in the dedicated air-to-water SCOP leaderboard.

What the size curve means for apartments, typical homes, and larger houses

For apartments and small, efficient dwellings, the small-band question is less “can a bigger unit hit a marginally higher SCOP?” and more “how much useful efficiency, quietness and fit can be packed into a compact output class?” The 2–6 kW sample already contains models above SCOP 6.0, such as METRO THERM A/S TRIPLE SOLAR PVT HEAT PUMP at 6.02 and METRO THERM A/S METRO DELTA PA-P at 6.02 (top_models / EPREL Public API via Househeating Pulse catalog). That suggests small systems do not start from an efficiency handicap in any absolute sense.

For typical detached homes, the 6–12 kW band is where the mainstream market average for air-water systems starts to look more natural. The air-water category average capacity is 11.83 kW, very close to the top end of this mid band (type_efficiency / EPREL Public API · type aggregation). This is also the segment where a buyer can compare many mainstream manufacturers via the manufacturer index, then stress-test local conditions with the sizing calculator and climate-fit tool.

For larger houses and light commercial loads, the data says the jump into 12+ kW should be justified by output need, not by assuming a major SCOP dividend. Yes, the top-ranked 12+ kW sample averages SCOP 6.66, above the mid-band’s 6.21 (top_models / EPREL Public API via Househeating Pulse catalog). But its average capacity is 45.98 kW, far beyond normal single-family demand in many cases (top_models / EPREL Public API via Househeating Pulse catalog). Larger systems can be excellent; they are simply not efficient in proportion to their size increase.

Buyer takeaway: when to pay for capacity and when not to

The practical reading of this EPREL evidence is straightforward.

If the heat load is genuinely small, do not assume a larger unit is inherently “better”. The small-band top sample averages SCOP 5.43 at 5.10 kW, already well above the whole-market average SCOP of 4.55 (top_models / EPREL Public API via Househeating Pulse catalog; market_index_snapshot / Househeating Pulse · Market Index v1, computed from EPREL Public API). In that segment, buyers should weigh efficiency density, siting and noise more carefully than headline capacity.

If the home sits in the middle of the market, 6–12 kW is the band where output rises meaningfully without yet drifting into commercial-scale hardware. The top-ranked sample’s average SCOP of 6.21 is strong, but the gain over the small-band sample is only 0.78 points while capacity rises by 4.08 kW (top_models / EPREL Public API via Househeating Pulse catalog).

If a project points toward 12+ kW, the decision should be load-led. Bigger units in the sample are much larger, but only moderately more efficient on SCOP. That makes them suitable when the building needs the output, not because the buyer expects a dramatic efficiency jump. Since the supplied corpus does not include price data, the installed-cost side cannot be quantified here; readers should pair model comparisons with the payback calculator, national subsidy pages and, where relevant, EU context from Eurostat.

Sources

• EPREL Public API via Househeating Pulse catalog — top_models, 2–6 kW SCOP-sorted sample, snapshot 2026-07-08
• EPREL Public API via Househeating Pulse catalog — top_models, 6–12 kW SCOP-sorted sample, snapshot 2026-07-08
• EPREL Public API via Househeating Pulse catalog — top_models, 12+ kW SCOP-sorted sample, snapshot 2026-07-08
• EPREL Public API · type aggregation — type_efficiency, snapshot 2026-07-08
• Househeating Pulse · Market Index v1, computed from EPREL Public API — market_index_snapshot, snapshot 2026-07-08

Continue reading

• How to size a heat pump without oversizing — Why design load matters more than buying the biggest unit on the list
• SCOP explained for heat-pump buyers — What seasonal efficiency does, and does not, tell you about running costs
• Air-to-water vs ground-source vs water-to-water — A practical read of the type differences behind the averages
• How to compare heat-pump noise ratings — What outdoor dB figures mean in practice, and where registry data can mislead