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Viessmann heat pump efficiency: 53 outdoor models compared

Viessmann has 53 heat pump outdoor models certified with this refrigerant group, in 123 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes Viessmann makes. Viessmann has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

New to heat pump ratings? The Simple view explains them in plain words →

ManufacturerData as of updated · sources

Outdoor models
53
AHRI certifications
123
Efficiency index
53%
Typical model vs same-size, same-type peers (67 models)
Meet CEE 2025
64.2%
34 models

How Viessmann compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.
Viessmann against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Viessmann’s own modelsViessmann is strongest on HSPF2 (its typical model beats 63% of comparable models) and weakest on EER2 (46%).
  • Viessmann
  • Middle half of its models
  • Other ranked manufacturers
Viessmann

Source: AHRI Directory, NEEP · as of

Average peer percentile of Viessmann’s models
RatingBeats comparable modelsRankRaw median
Efficiency index67 models scored53%Not ranked—
COP at 5°F67 models scored52%Not ranked1.95
Capacity retention at 5°F67 models scored50%Not ranked67%
HSPF267 models scored63%Not ranked9.2
SEER267 models scored58%Not ranked18.7
EER267 models scored46%Not ranked10.7
Heating capacity at 5°F67 models scored50%Not ranked18,000 Btu/h

Standards met

Share of Viessmann’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)64.2%34
CEE 2026 Tier 1 (Split ASHP)60.4%32
CEE Advanced Tier (Split ASHP)3.8%2
Xcel Energy Colorado cold-climate ASHP (2025)43.4%23
DOE Cold Climate Heat Pump Challenge3.8%2
ENERGY STAR Cold Climate47.2%25

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
Viessmann’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line
  • Viessmann (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsDucted, 5 tons and up1.90239 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, up to 1.5 tons661%54%72%64%
Ducted, 2 tons465%49%82%77%
Ducted, 2.5–3 tons955%45%78%66%
Ducted, 3.5–4.5 tons659%45%88%70%
Ducted, 5 tons and up249%49%77%61%
Non-ducted, up to 1.5 tons2053%59%60%51%
Non-ducted, 2 tons447%53%51%50%
Non-ducted, 2.5–3 tons1147%47%40%54%
Non-ducted, 3.5–4.5 tons546%53%46%46%

Every Viessmann model in the market

Viessmann’s 67 models with a known size and duct type, over the shape of the whole catalog.
Viessmann models by size and ratingColoured: Viessmann · grey shapes: all 11,475 models · lines: catalog medians by size
  • Viessmann models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 67 viessmann models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 models, half a ton at a time.
Show the data as a table
COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, sizeModels10th pct.25thMedian75th90th
Ducted, 0.5 tons1751.701.851.902.102.26
Ducted, 1 ton3401.851.902.002.402.65
Ducted, 1.5 tons7891.751.852.002.202.55
Ducted, 2 tons7821.731.802.002.102.33
Ducted, 2.5 tons7351.711.801.902.092.48
Ducted, 3 tons6521.681.701.902.062.36
Ducted, 3.5 tons6411.611.801.952.202.50
Ducted, 4 tons3671.701.801.912.022.52
Ducted, 4.5 tons5441.701.801.912.082.34
Ducted, 5 tons251.801.801.901.902.15
Non-ducted, 0.5 tons7171.751.811.972.102.19
Non-ducted, 1 ton1,0641.751.801.902.072.25
Non-ducted, 1.5 tons8861.801.801.872.072.21
Non-ducted, 2 tons5641.801.801.832.042.21
Non-ducted, 2.5 tons2751.801.811.841.862.03
Non-ducted, 3 tons5021.801.801.902.002.09
Non-ducted, 3.5 tons701.821.831.902.002.28
Non-ducted, 4 tons2631.801.801.982.002.10
Non-ducted, 4.5 tons1031.771.771.801.972.02
Non-ducted, 5 tons291.982.002.102.302.47

Source: AHRI Directory · as of

Top Viessmann models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 5 Viessmann cold-climate picks across sizes. Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2Btu/h @5°FSEER2MeetsCombosAHRI ref.Compared withScore
1DLCPRBH18AAKViessmann · DLC-serieswith ductless indoor unit DLFPHBH18XAK1.5 tons18,000 Btu/h · Non-ducted120%2.8911.024,00026.3CEE 25CEE 26CEE AdvXcelDOEES CC1215569835Non-ducted, up to 1.5 tons95.0
2DLCSRBH06AAKViessmann · DLC-serieswith ductless indoor unit DLFSHCH06XAK0.5 tons6,000 Btu/h · Non-ducted107%2.0913.67,50026.5CEE 25CEE 26XcelES CC3215569846Non-ducted, up to 1.5 tons89.3
3DLCSRBH24AAKViessmann · DLC-serieswith ductless indoor unit DLFSCBH24XAK2 tons24,000 Btu/h · Non-ducted103%2.0011.525,80020.5CEE 25CEE 26CEE AdvXcelDOEES CC7215569833Non-ducted, 2 tons86.1
4DLCSRBH18AAKViessmann · DLC-serieswith ducted air handler DLFSDAH18XHK1.5 tons17,500 Btu/h · Ducted95%2.2010.818,00018.0CEE 25CEE 26XcelES CC10215569862Ducted, up to 1.5 tons81.3
5DLCMHBH48EAKViessmann · DLC-series4 tons48,000 Btu/h · Non-ducted92%2.0010.045,00021.2CEE 25CEE 26XcelES CC3215569822Non-ducted, 3.5–4.5 tons80.5

All-around best

Top 5 Viessmann models on the all-around score across sizes. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2SEER2EER2MeetsCombosAHRI ref.Compared withScoreHeating halfCooling halfCold-climate score
1DLCPRBH18AAKViessmann · DLC-serieswith ductless indoor unit DLFPHBH18XAK1.5 tons18,000 Btu/h · Non-ducted120%2.8911.026.315.3CEE 25CEE 26CEE AdvXcelDOEES CC1215569835Non-ducted, up to 1.5 tons93.695.092.195.0
2DLCSRBH06AAKViessmann · DLC-serieswith ductless indoor unit DLFSHCH06XAK0.5 tons6,000 Btu/h · Non-ducted107%2.0913.626.515.8CEE 25CEE 26XcelES CC3215569846Non-ducted, up to 1.5 tons92.089.394.789.3
3DLCSRBH09AAKViessmann · DLC-serieswith ductless indoor unit DLFSHCH09XAK1 ton9,000 Btu/h · Non-ducted88%1.9711.528.116.2CEE 25CEE 26XcelES CC7215569842Non-ducted, up to 1.5 tons87.076.297.976.2
4DLCPRBH09AAKViessmann · DLC-serieswith ductless indoor unit DLFPHBH09XAK1 ton9,000 Btu/h · Non-ducted114%1.8511.527.016.0CEE 25CEE 26XcelES CC2215569809Non-ducted, up to 1.5 tons86.076.096.076.0
5DLCSRBH09AAKViessmann · DLC-serieswith ducted air handler DLFSDAH09XAK1 ton9,000 Btu/h · Ducted108%1.9012.020.213.2CEE 25CEE 26XcelES CC7215569786Ducted, up to 1.5 tons85.274.995.574.9

Best model on each rating

Viessmann’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FDLCPRBH18AAK2.89Non-ducted, up to 1.5 tons99%215569835
Capacity retention at 5°FDLCPRBH18AAK120%Non-ducted, up to 1.5 tons97%215569835
HSPF2DLCPRBH09AAK15.0Non-ducted, up to 1.5 tons100%215569870
SEER2DLCMHBH48EAK20.9Ducted, 3.5–4.5 tons99%215569823
EER2DLCSRBH09AAK16.2Non-ducted, up to 1.5 tons98%215569842
Heating capacity at 5°FDLCPRBH18AAK24,000 Btu/hNon-ducted, up to 1.5 tons100%215569835

All 53 Viessmann models in Explore

Viessmann size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.
Viessmann: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct typeCold-climate pickCold-climate score, best modelAll-around bestAll-around score, best model
Ducted, up to 1.5 tons81.3(50 is the typical model of its size class)DLCSRBH18AAKwith ducted air handler DLFSDAH18XHK5 of 6 models qualify · AHRI 21556986285.2(50 is the typical model of its size class)DLCSRBH09AAKwith ducted air handler DLFSDAH09XAK6 of 6 models have all five ratings · AHRI 215569786
Ducted, 2 tons79.4(50 is the typical model of its size class)DLCSRBH24AAKwith ducted air handler DLFSDAH24XAK4 of 4 models qualify · AHRI 21556979480.1(50 is the typical model of its size class)DLCSRBH24AAKwith ducted air handler DLFSDAH24XAK4 of 4 models have all five ratings · AHRI 215569794
Ducted, 2.5–3 tons78.6(50 is the typical model of its size class)DLCURAH36ABKwith ducted air handler DLFULAH36XCX + CI3 of 9 models qualify · AHRI 21556976972.0(50 is the typical model of its size class)DLCMHBH30DAK9 of 9 models have all five ratings · AHRI 215569818
Ducted, 3.5–4.5 tons74.9(50 is the typical model of its size class)DLCMHBH48EAK4 of 6 models qualify · AHRI 21556982382.0(50 is the typical model of its size class)DLCMHBH48EAK6 of 6 models have all five ratings · AHRI 215569823
Ducted, 5 tons and upNone on this board (0 of 2 models qualify)57.1(50 is the typical model of its size class)DLCLRCH58AAKwith ducted air handler DLFLDAH58XAK2 of 2 models have all five ratings · AHRI 215569836
Non-ducted, up to 1.5 tons95.0(50 is the typical model of its size class)DLCPRBH18AAKwith ductless indoor unit DLFPHBH18XAK11 of 20 models qualify · AHRI 21556983593.6(50 is the typical model of its size class)DLCPRBH18AAKwith ductless indoor unit DLFPHBH18XAK20 of 20 models have all five ratings · AHRI 215569835
Non-ducted, 2 tons86.1(50 is the typical model of its size class)DLCSRBH24AAKwith ductless indoor unit DLFSCBH24XAK2 of 4 models qualify · AHRI 21556983384.3(50 is the typical model of its size class)DLCSRBH24AAKwith ductless indoor unit DLFSHCH24XAK4 of 4 models have all five ratings · AHRI 215569840
Non-ducted, 2.5–3 tons73.4(50 is the typical model of its size class)DLCMHBH36DAK2 of 11 models qualify · AHRI 21556982470.8(50 is the typical model of its size class)DLCMHBH36DAK11 of 11 models have all five ratings · AHRI 215569824
Non-ducted, 3.5–4.5 tons80.5(50 is the typical model of its size class)DLCMHBH48EAK3 of 5 models qualify · AHRI 21556982273.8(50 is the typical model of its size class)DLCMHBH48EAK5 of 5 models have all five ratings · AHRI 215569822

All-around board, every manufacturer

Newest Viessmann certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified Viessmann outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
DLCLRCH48AAKViessmann · DLC-serieswith ductless indoor unit DLFLCBH48XAK4 tons48,000 Btu/h · Ducted and non-ducted1.9869%9.818.5XcelES CC5215569885
DLCMRBH48EAKViessmann4 tons48,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.7567%9.620.8CEE 25CEE 263215569884
DLCMHBH36DAKViessmann · DLC-series3 tons36,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.8093%9.919.5CEE 25CEE 26XcelES CC3215569883
DLCMHBH48EAKViessmann · DLC-series4 tons47,500 Btu/h · Ducted and non-ducted and mixed (multi-zone)2.0089%9.421.1CEE 25CEE 26XcelES CC3215569882
DLCMRBH36DAKViessmann3 tons36,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.7465%9.421.6CEE 253215569881

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Viessmann includes these brand names as listed in AHRI: Viessmann. Standards are checked against published thresholds; program rules beyond ratings are not checked.