iStore vs Rinnai:Which is more popular?
In September 2026, iStore had more branded searches than Rinnai among hot water system brands in Australia. iStore had about 2,400 branded searches, while Rinnai had 1,000. iStore made up 12.7% of all hot water system brand searches we track, and Rinnai accounted for 5.3%. When we asked ChatGPT and Google AI Overviews about hot water system brands, iStore appeared in four of the five answers and Rinnai in two. iStore was mentioned before Rinnai in four out of five answers.
Who do people search for more?
iStore, about 2 searches for every 1 for Rinnai
Who does AI mention more?
iStore, mentioned in 4 of 5 answers, Rinnai in 2
Who does AI recommend more?
iStore, named ahead of Rinnai in 4 of 5 answers
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Top hot water system brands in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, iStore was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Rinnai was mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. iStore was listed before Rinnai in four out of five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
- iStore1st
Rheem2nd
Reclaim Energy3rd- Dux4th
Rinnai5th
Stiebel Eltron6th
Aquamax–- SandenTherm–
Thermann–
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
Asked ChatGPT
“What's the best hot water system in Australia?”
Asked ChatGPT
“Which heat pump hot water system should I buy?”
Asked ChatGPT
“Is gas or electric hot water better, and which brand?”
Searched Google, AI Overview
“hot water system”
Searched Google, AI Overview
“heat pump hot water”
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 iStore or Rinnai more popular in search?
This chart shows how often people search Google for iStore and Rinnai 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.
Share of searches by month for iStore, Rinnai. The figures are in the table below the chart.
View monthly share of searches table
| Month | Rheem | Dux | iStore | Reclaim Energy | Aquamax | Stiebel Eltron | Rinnai | SandenTherm | Thermann | Apricus |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 20.9% | 19.2% | 12.1% | 10.4% | 1.1% | 7.9% | 10% | 3.7% | 2.5% | 12.1% |
| Nov 2025 | 21.5% | 19.8% | 10.3% | 10.7% | 0.91% | 8.2% | 10.3% | 3.1% | 2.5% | 12.5% |
| Dec 2025 | 17.3% | 31.8% | 8.1% | 7.2% | 0.89% | 6.8% | 8.1% | 2.5% | 2% | 15.3% |
| Jan 2026 | 18.9% | 18.1% | 8.8% | 10.1% | 1.5% | 7.4% | 8.8% | 3.3% | 2.7% | 20.4% |
| Feb 2026 | 20.5% | 18.5% | 11.7% | 10.7% | 1.6% | 7.8% | 9.3% | 3.5% | 2.3% | 14.2% |
| Mar 2026 | 22.5% | 15.3% | 13.1% | 11.2% | 1.8% | 8.6% | 8.6% | 3.2% | 2.7% | 13.1% |
| Apr 2026 | 23.4% | 15.9% | 13.6% | 11.1% | 1.5% | 7.5% | 8.9% | 4.1% | 2.8% | 11.2% |
| May 2026 | 28.8% | 18.4% | 11.3% | 11.7% | 1.5% | 9% | 9% | 4.1% | 2.8% | 3.4% |
| Jun 2026 | 27.3% | 16.9% | 12.9% | 13.3% | 1.7% | 10.7% | 8.5% | 3.9% | 2.6% | 2.1% |
| Jul 2026 | 26.3% | 16.8% | 14.9% | 12.8% | 2% | 9.8% | 8.2% | 3.7% | 3% | 2.5% |
| Aug 2026 | 24.5% | 18.1% | 17.2% | 14.3% | 1.9% | 9.1% | 6.2% | 3.4% | 2.8% | 2.3% |
| Sep 2026 | 22.3% | 20.7% | 12.7% | 11% | 10.1% | 10.1% | 5.3% | 3.1% | 2.5% | 2.1% |
How has the iStore and Rinnai comparison changed over the last 12 months?
3 findings
- iStore was ahead of Rinnai in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, iStore’s share of searches among hot water system brands in Australia moved from 12.1% to 12.7%, and its estimated monthly branded searches moved from 2.9K to 2.4K.
- Across the 12 months ending September 2026, Rinnai’s share of searches among hot water system brands in Australia moved from 10% to 5.3%, and its estimated monthly branded searches moved from 2.4K to 1K.
How did search popularity change for Australia hot water system brands in September 2026?
3 changes
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.
In September 2026, iStore lost share of searches among hot water system brands in Australia, from 17.2% to 12.7%.
In September 2026, Rinnai lost share of searches among hot water system brands in Australia, from 6.2% to 5.3%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using iStore’s and Rinnai’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.
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