Rheem vs Rinnai:Which is more popular?
In September 2026, Rheem had more branded searches than Rinnai among tankless water heater brands worldwide. Rheem had about 12,100 branded searches, while Rinnai had 1,600. Rheem made up 15.3% of all tankless water heater brand searches we track, and Rinnai accounted for 2%. When we asked ChatGPT and Google AI Overviews about tankless water heater brands, Rheem and Rinnai each appeared in three of the five answers. Rinnai was mentioned before Rheem in every answer.
Who do people search for more?
Rheem, about 8 searches for every 1 for Rinnai
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
Rinnai, named ahead of Rheem in every answer
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Top tankless water heater brands in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Rheem and Rinnai were each mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Rinnai was listed before Rheem in every answer.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Navien3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers- Rheem3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Rinnai3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Noritz1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Takagi0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
EcoSmart0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about tankless water heater brands
5 answers
Asked ChatGPT
“What's the best tankless water heater?”
Asked ChatGPT
“Which tankless water heater brand is most reliable?”
Asked ChatGPT
“Should I get a gas or electric tankless water heater?”
Searched Google, AI Overview
“tankless water heater”
Searched Google, AI Overview
“best tankless water heater”
Brands are shown in the order each answer named them. The survey took place in the United States on October 27, 2026.
Is Rheem or Rinnai more popular in search?
This chart shows how often people search Google for Rheem and Rinnai by name. Each line represents a brand's share of searches for all six tankless water heater brands we track, month by month, from English-language searches worldwide.
Share of searches by month for Rheem, Rinnai. The figures are in the table below the chart.
View monthly share of searches table
| Month | Navien | Rheem | Noritz | Takagi | Rinnai | EcoSmart |
|---|---|---|---|---|---|---|
| Oct 2025 | 68.8% | 20.5% | 6.1% | 2.7% | 1.5% | 0.54% |
| Nov 2025 | 71.1% | 17.4% | 6.3% | 2.8% | 1.5% | 0.84% |
| Dec 2025 | 64.1% | 23.4% | 7% | 3.1% | 1.6% | 0.76% |
| Jan 2026 | 64.4% | 24.9% | 6.1% | 2.7% | 1.4% | 0.54% |
| Feb 2026 | 68.7% | 20.4% | 6.1% | 2.7% | 1.7% | 0.36% |
| Mar 2026 | 67.4% | 22.6% | 5.5% | 2.4% | 1.6% | 0.49% |
| Apr 2026 | 58.6% | 31.8% | 5.2% | 2.3% | 1.5% | 0.57% |
| May 2026 | 53.7% | 35.7% | 5.8% | 2.6% | 1.7% | 0.52% |
| Jun 2026 | 67.4% | 20% | 7.3% | 2.6% | 2.2% | 0.53% |
| Jul 2026 | 67.2% | 21.3% | 6.3% | 2.8% | 1.9% | 0.46% |
| Aug 2026 | 67.2% | 20% | 7.3% | 2.6% | 2.2% | 0.8% |
| Sep 2026 | 72.9% | 15.3% | 6.8% | 2.4% | 2% | 0.61% |
Rheem and Rinnai sell other things too, so only their searches that name this product count here, like “rheem tankless”.
How has the Rheem and Rinnai comparison changed over the last 12 months?
3 findings
- Rheem was ahead of Rinnai in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Rheem’s share of searches among tankless water heater brands worldwide moved from 20.5% to 15.3%, and its estimated monthly branded searches moved from 22.2K to 12.1K.
- Across the 12 months ending September 2026, Rinnai’s share of searches among tankless water heater brands worldwide moved from 1.5% to 2%, and its estimated monthly branded searches held steady at 1.6K.
How did search popularity change for tankless water heater brands worldwide in September 2026?
1 change
In September 2026, Rheem lost share of searches among tankless water heater brands worldwide, from 20% to 15.3%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Rheem’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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