Brandwave

Rheem vs Thermann:Which is more popular?

In September 2026, Rheem had more branded searches than Thermann among hot water system brands in Australia. Rheem had about 4,190 branded searches, while Thermann had 480. Rheem made up 22.3% of all hot water system brand searches we track, and Thermann accounted for 2.5%. When we asked ChatGPT and Google AI Overviews about hot water system brands, Rheem appeared in four of the five answers and Thermann in none.

Among hot water system brands in Australia in September 2026

Who do people search for more?

Rheem, about 9 searches for every 1 for Thermann

Rheem 4.2K searchesThermann 480 searches

Who does AI mention more?

Rheem, mentioned in 4 of 5 answers, Thermann in 0

Rheem in 4 of 5Thermann in 0 of 5

Who does AI recommend more?

Rheem, the only one of the two named

Rheem first in 4Thermann never named

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Top hot water system brands in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Rheem was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Thermann did not appear in any of the five answers.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. iStore1st
  2. Rheem2nd
  3. Reclaim Energy3rd
  4. Dux4th
  5. Rinnai5th
  6. Stiebel Eltron6th
  7. Aquamax–
  8. SandenTherm–
  9. Thermann–
  10. Apricus–

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Rheem4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • iStore4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Reclaim Energy2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Rinnai2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Dux1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Stiebel Eltron1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Aquamax0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • SandenTherm0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Thermann0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Apricus0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about hot water system brands

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in Australia on October 27, 2026.

Is Rheem or Thermann more popular in search?

This chart shows how often people search Google for Rheem and Thermann by name. Each line represents a brand's share of searches for all ten hot water system brands we track, month by month, from searches in Australia.

Rheem and Thermann among hot water system brands in Australia, by month

Share of searches by month for Rheem, Thermann. The figures are in the table below the chart.

View monthly share of searches table
MonthRheemDuxiStoreReclaim EnergyAquamaxStiebel EltronRinnaiSandenThermThermannApricus
Oct 202520.9%19.2%12.1%10.4%1.1%7.9%10%3.7%2.5%12.1%
Nov 202521.5%19.8%10.3%10.7%0.91%8.2%10.3%3.1%2.5%12.5%
Dec 202517.3%31.8%8.1%7.2%0.89%6.8%8.1%2.5%2%15.3%
Jan 202618.9%18.1%8.8%10.1%1.5%7.4%8.8%3.3%2.7%20.4%
Feb 202620.5%18.5%11.7%10.7%1.6%7.8%9.3%3.5%2.3%14.2%
Mar 202622.5%15.3%13.1%11.2%1.8%8.6%8.6%3.2%2.7%13.1%
Apr 202623.4%15.9%13.6%11.1%1.5%7.5%8.9%4.1%2.8%11.2%
May 202628.8%18.4%11.3%11.7%1.5%9%9%4.1%2.8%3.4%
Jun 202627.3%16.9%12.9%13.3%1.7%10.7%8.5%3.9%2.6%2.1%
Jul 202626.3%16.8%14.9%12.8%2%9.8%8.2%3.7%3%2.5%
Aug 202624.5%18.1%17.2%14.3%1.9%9.1%6.2%3.4%2.8%2.3%
Sep 202622.3%20.7%12.7%11%10.1%10.1%5.3%3.1%2.5%2.1%

How has the Rheem and Thermann comparison changed over the last 12 months?

3 findings
  • Rheem was ahead of Thermann in every measured month of the 12 months ending September 2026.
  • Across the 12 months ending September 2026, Rheem’s share of searches among hot water system brands in Australia moved from 20.9% to 22.3%, and its estimated monthly branded searches moved from 5K to 4.2K.
  • Across the 12 months ending September 2026, Thermann’s share of searches among hot water system brands in Australia held steady at 2.5%, and its estimated monthly branded searches moved from 590 to 480.

How did search popularity change for Australia hot water system brands in September 2026?

3 changes

  1. In September 2026, Aquamax overtook Stiebel Eltron and 4 others to rank 5th among hot water system brands in Australia, with 10.1% of the searches.

  2. In September 2026, Rheem lost share of searches among hot water system brands in Australia, from 24.5% to 22.3%.

  3. Estimated monthly branded searches for Thermann in Australia fell 18.6% over 12 measured months, from 590 to 480 in September 2026.

How are branded searches counted?

3 search terms

Brandwave collects information about searches that people make online using Rheem’s and Thermann’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Rheem

2 branded search terms

  • rheem
  • rheem hot water

Thermann

1 branded search term

  • thermann

How the Brand Demand Index is measured

Other head-to-heads among hot water system brands

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