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TGM vs Viessmann: heat pump ratings compared

Against heat pumps of the same size and type, a typical TGM model beats 45% and a typical Viessmann model 60%. Viessmann rates higher overall.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

TGM

45%

of similar heat pumps beaten by its typical model

Below average

77 models listed

Viessmann

60%

of similar heat pumps beaten by its typical model

Well above average

43 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°FTGM: Beats 48%Viessmann: Beats 53%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FTGM: Beats 42%Viessmann: Beats 72%
  • Winter-long heating efficiencyHSPF2TGM: Beats 41%Viessmann: Beats 74%
  • Summer-long cooling efficiencySEER2TGM: Beats 45%Viessmann: Beats 59%
  • Hot-day cooling efficiencyEER2TGM: Beats 42%Viessmann: Beats 49%

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

    TGM
    58%
    Viessmann
    84%

  • Xcel CC

    TGM
    55%
    Viessmann
    79%

  • CEE Advanced

    TGM
    1%
    Viessmann
    5%

  • ENERGY STAR CC

    TGM
    21%
    Viessmann
    70%

Top cold-climate picks, ductless 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 Ductless, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

TGM

  1. 1ARHHBT18ASwith ductless indoor unit AWHHBT18STGM1.5 tons · 18,000 Btu/h · DuctlessKeeps 82% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    82% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.25 (COP at 5°F)
    Great
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    79.2score / 100
  2. 2MRS5VHT18ASwith ductless indoor unit MC45VHT18STGM1.5 tons · 16,800 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.19 (COP at 5°F)
    Great
    Seasonal efficiency
    11.4 (HSPF2)
    Top 10%
    68.2score / 100
  3. 3ARHHBT12ASAwith ductless indoor unit AWHHBT12SATGM1 ton · 12,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    64.0score / 100

Viessmann

  1. 1D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAKViessmann0.5 tons · 6,000 Btu/h · DuctlessKeeps 110% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
    Heat kept at 5°F
    110% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.40 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    14.8 (HSPF2)
    Top 10%
    96.7score / 100
  2. 2D5CSHAH12AAKwith ductless indoor unit D5FSCAH12XAKViessmann1 ton · 12,000 Btu/h · DuctlessKeeps 96% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    96% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.99 (COP at 5°F)
    Good
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    76.1score / 100
  3. 3D5CMHAH18CAKViessmann1.5 tons · 19,000 Btu/h · DuctlessKeeps 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)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    74.3score / 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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