Navien vs Rheem:Which is more popular?
In September 2026, Navien had more branded searches than Rheem among tankless water heater brands worldwide. Navien had about 57,700 branded searches, while Rheem had 12,100. Navien made up 72.9% of all tankless water heater brand searches we track, and Rheem accounted for 15.3%. When we asked ChatGPT and Google AI Overviews about tankless water heater brands, Navien and Rheem each appeared in three of the five answers. Navien was mentioned before Rheem in every answer.
Who do people search for more?
Navien, about 5 searches for every 1 for Rheem
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
Navien, 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, Navien and Rheem were each mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Navien 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 Navien or Rheem more popular in search?
This chart shows how often people search Google for Navien and Rheem 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 Navien, Rheem. 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 sells other things too, so only its searches that name this product count here, like “rheem tankless”.
How has the Navien and Rheem comparison changed over the last 12 months?
3 findings
- Navien was ahead of Rheem in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Navien’s share of searches among tankless water heater brands worldwide moved from 68.8% to 72.9%, and its estimated monthly branded searches moved from 74.6K to 57.7K.
- 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.
How did search popularity change for tankless water heater brands worldwide in September 2026?
2 changes
In September 2026, Navien gained share of searches among tankless water heater brands worldwide, from 67.2% to 72.9%.
In September 2026, Rheem lost share of searches among tankless water heater brands worldwide, from 20% to 15.3%.
How are branded searches counted?
4 search terms
Brandwave collects information about searches that people make online using Navien’s and Rheem’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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