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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%

All-around best, ductless 5 tons and up

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.

Showing Ductless, 5 tons and up (57,000 Btu/h and up cooling). What size is my system?

TGM

No ductless, 5 tons and up model from TGM.

Viessmann

No ductless, 5 tons and up model from Viessmann.

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.

Open the advanced view