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SLIMAIR vs Viessmann: heat pump ratings compared

Against heat pumps of the same size and type, a typical SLIMAIR model beats 59% and a typical Viessmann model 53%. SLIMAIR rates higher overall.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

SLIMAIR

59%

of similar heat pumps beaten by its typical model

Above average

54 models listed

Viessmann

53%

of similar heat pumps beaten by its typical model

About average

53 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FSLIMAIR: Beats 47%Viessmann: Beats 52%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FSLIMAIR: Beats 58%Viessmann: Beats 50%
  • Winter-long heating efficiencyHSPF2SLIMAIR: Beats 71%Viessmann: Beats 63%
  • Summer-long cooling efficiencySEER2SLIMAIR: Beats 65%Viessmann: Beats 58%
  • Hot-day cooling efficiencyEER2SLIMAIR: Beats 49%Viessmann: Beats 46%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    SLIMAIR
    67%
    Viessmann
    64%

  • Xcel CC

    SLIMAIR
    50%
    Viessmann
    43%

  • CEE Advanced

    SLIMAIR
    2%
    Viessmann
    4%

  • ENERGY STAR CC

    SLIMAIR
    43%
    Viessmann
    47%

Top cold-climate picks, ducted up to 1.5 tons

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

Showing Ducted, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

SLIMAIR

  1. 1SHC09VH2AGwith ducted air handler SHD09VC2AGSLIMAIR1 ton · 9,000 Btu/h · DuctedKeeps 108% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    108% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    12.0 (HSPF2)
    Top 10%
    74.9score / 100
  2. 2SHC09VE2AGwith ducted air handler SHD09VC2AGSLIMAIR1 ton · 9,000 Btu/h · DuctedKeeps 80% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    80% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.09 (COP at 5°F)
    Good
    Seasonal efficiency
    10.2 (HSPF2)
    Great
    70.4score / 100
  3. 3SHC12VE2AGwith ducted air handler SHD12VC2AGSLIMAIR1 ton · 11,500 Btu/h · DuctedKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.26 (COP at 5°F)
    Great
    Seasonal efficiency
    10.3 (HSPF2)
    Great
    67.8score / 100

Viessmann

  1. 1DLCSRBH18AAKwith ducted air handler DLFSDAH18XHKViessmann1.5 tons · 17,500 Btu/h · DuctedKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Great
    Seasonal efficiency
    10.8 (HSPF2)
    Top 10%
    81.3score / 100
  2. 2DLCSRBH09AAKwith ducted air handler DLFSDAH09XAKViessmann1 ton · 9,000 Btu/h · DuctedKeeps 108% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    108% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    12.0 (HSPF2)
    Top 10%
    74.9score / 100
  3. 3DLCSRBH12AAKwith ducted air handler DLFSDAH12XAKViessmann1 ton · 12,000 Btu/h · DuctedKeeps 97% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    97% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.96 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.0 (HSPF2)
    Great
    65.4score / 100

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Next steps

The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.

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