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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, 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?

TGM

  1. 1MRS5VHT18ASwith ducted air handler MFC5VHT18STGM1.5 tons · 17,500 Btu/h · DuctedKeeps 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
    2.41 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    11.3 (HSPF2)
    Top 10%
    69.8score / 100
  2. 2TMRHT18AS2TGM1.5 tons · 18,000 Btu/h · DuctedKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    44.0score / 100
  3. 3GMRSHT18AS2TGM1.5 tons · 18,000 Btu/h · DuctedKeeps 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)
    Good
    Efficiency at 5°F
    1.86 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    8.1 (HSPF2)
    Below the middle
    39.3score / 100

Viessmann

  1. 1D5CUHAH18AAKwith ducted air handler D5MUWAQ18XA3Viessmann1.5 tons · 18,000 Btu/h · DuctedKeeps 103% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
    Heat kept at 5°F
    103% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Seasonal efficiency
    10.8 (HSPF2)
    Top 10%
    86.7score / 100
  2. 2D5CSHAH18AAKwith ducted air handler D5FSDAH18XHKViessmann1.5 tons · 17,500 Btu/h · DuctedKeeps 92% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    92% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Seasonal efficiency
    11.1 (HSPF2)
    Top 10%
    82.3score / 100
  3. 3D5CSHAH09AAKwith ducted air handler D5FSDAH12XAKViessmann1 ton · 9,000 Btu/h · DuctedKeeps 112% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    112% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.89 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    12.5 (HSPF2)
    Top 10%
    80.0score / 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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