---
title: "Tankless water heater brands: Which are searched most?"
description: "Compare the gas and electric tankless water heaters that heat water on demand. Share of Search among Navien, Rheem, Noritz, Takagi, Rinnai and EcoSmart, the tankless water heater brands Brandwave compares worldwide, using the same methodology, market, and reporting period. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time."
canonical: "https://gobrandwave.com/demand/global-en/categories/tankless-water-heater-brands"
publisher: "Brandwave"
---

# Tankless water heater brands: Which are searched most?

Compare the gas and electric tankless water heaters that heat water on demand. Share of Search among Navien, Rheem, Noritz, Takagi, Rinnai and EcoSmart, the tankless water heater brands Brandwave compares worldwide, using the same methodology, market, and reporting period. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time.

## Key facts

- **Competitive set**: Tankless water heater brands
- **Market**: Global
- **Brands compared**: 6
- **Month measured**: Sep 2026
- **Highest Share of Search**: Navien, 72.9%

## Which brand is most popular in search among tankless water heater brands worldwide?

- In September 2026, Navien was the most searched among tankless water heater brands worldwide, with an estimated 57.7K branded searches, 72.9% of all searches for the six we track.
- Rheem is in 2nd place, 57.6 percentage points behind at 15.3%.
- Across the 12 months ending September 2026, Navien’s share of searches among tankless water heater brands worldwide increased from 68.8% to 72.9%.
- Across the 12 months ending September 2026, Rheem’s share of searches among tankless water heater brands worldwide decreased from 20.5% to 15.3%.
- Across the 12 months ending September 2026, Noritz’s share of searches among tankless water heater brands worldwide increased from 6.1% to 6.8%.
- Across the 12 months ending September 2026, Rinnai’s share of searches among tankless water heater brands worldwide increased from 1.5% to 2%.
- Across the 12 months ending September 2026, Navien’s share of searches among tankless water heater brands worldwide peaked at 72.9% in September 2026 and was lowest at 53.7% in May 2026.
- Across the 12 months ending September 2026, Rheem’s share of searches among tankless water heater brands worldwide peaked at 35.7% in May 2026 and was lowest at 15.3% in September 2026.
- Across the 12 months ending September 2026, Noritz’s share of searches among tankless water heater brands worldwide peaked at 7.3% in June 2026 and was lowest at 5.2% in April 2026.
- Across the 12 months ending September 2026, Takagi and EcoSmart held steady: their share of searches among tankless water heater brands worldwide each moved less than 0.5 percentage points.

## Top tankless water heater brands in ChatGPT and Google AI Overviews

In Brandwave's three ChatGPT questions and two Google AI Overviews, Navien, Rheem and Rinnai were mentioned most often, in three of the five answers. Rinnai was recommended most often, coming first in all three answers that gave a list. Navien was second, and Rheem was third. Takagi, which ranked fourth in searches, was not mentioned at all.

Brands get a higher AI rank if they are mentioned earlier in the answers that list options.

| Brand | AI rank | ChatGPT answers that named it | Google AI Overviews that named it | All answers that named it |
| --- | --- | --- | --- | --- |
| Rinnai | 1st | 2 of 3 | 1 of 2 | 3 of 5 |
| Navien | 2nd | 2 of 3 | 1 of 2 | 3 of 5 |
| Rheem | 3rd | 2 of 3 | 1 of 2 | 3 of 5 |
| Noritz | 4th | 1 of 3 | 0 of 2 | 1 of 5 |
| Takagi | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 |
| EcoSmart | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 |

## Every AI answer about tankless water heater brands

- Asked ChatGPT "What's the best tankless water heater?": 1. Rinnai, 2. Navien, 3. Rheem
- Asked ChatGPT "Which tankless water heater brand is most reliable?": 1. Rinnai, 2. Noritz, 3. Navien, 4. Rheem
- Asked ChatGPT "Should I get a gas or electric tankless water heater?": named none of the brands we track
- Searched Google, AI Overview "tankless water heater": named none of the brands we track
- Searched Google, AI Overview "best tankless water heater": 1. Rinnai, 2. Navien, 3. Rheem

Not named in any answer: Takagi and EcoSmart.

Brands are listed in the order each answer named them. The answers were collected in the United States on October 27, 2026.

## Compare search popularity between leading brands

- [Navien vs Rheem: compare search popularity](/demand/global-en/compare/navien-vs-rheem): 72.9% against 15.3% Share of Search.
- [Navien vs Noritz: compare search popularity](/demand/global-en/compare/navien-vs-noritz): 72.9% against 6.8% Share of Search.
- [Navien vs Takagi: compare search popularity](/demand/global-en/compare/navien-vs-takagi): 72.9% against 2.4% Share of Search.
- [Navien vs Rinnai: compare search popularity](/demand/global-en/compare/navien-vs-rinnai): 72.9% against 2% Share of Search.
- [Rheem vs Noritz: compare search popularity](/demand/global-en/compare/noritz-vs-rheem): 15.3% against 6.8% Share of Search.
- [Rheem vs Takagi: compare search popularity](/demand/global-en/compare/rheem-vs-takagi): 15.3% against 2.4% Share of Search.
- [Rheem vs Rinnai: compare search popularity](/demand/global-en/compare/rheem-vs-rinnai): 15.3% against 2% Share of Search.
- [Noritz vs Takagi: compare search popularity](/demand/global-en/compare/noritz-vs-takagi): 6.8% against 2.4% Share of Search.
- [Noritz vs Rinnai: compare search popularity](/demand/global-en/compare/noritz-vs-rinnai): 6.8% against 2% Share of Search.
- [Takagi vs Rinnai: compare search popularity](/demand/global-en/compare/rinnai-vs-takagi): 2.4% against 2% Share of Search.

## How did search popularity change for tankless water heater brands worldwide in September 2026?

- 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%.
- Estimated monthly branded searches for Takagi worldwide fell 34.5% over 12 measured months, from 2.9K to 1.9K in September 2026.
- Estimated monthly branded searches for EcoSmart worldwide fell 18.6% over 12 measured months, from 590 to 480 in September 2026.
- Estimated monthly branded searches for Noritz worldwide fell 18.2% over 12 measured months, from 6.6K to 5.4K in September 2026.

## Share of Search ranking

| Rank | Brand | Share of Search | Estimated monthly branded searches | Change vs prior month | Owned by |
| --- | --- | --- | --- | --- | --- |
| 1 | Navien | 72.9% | 57.7K | +15.9% | Navien |
| 2 | Rheem | 15.3% | 12.1K | -18.2% | Rheem |
| 3 | Noritz | 6.8% | 5.4K | 0.0% | Noritz |
| 4 | Takagi | 2.4% | 1.9K | 0.0% | Takagi |
| 5 | Rinnai | 2% | 1.6K | 0.0% | Rinnai |
| 6 | EcoSmart | 0.61% | 480 | -18.6% | EcoSmart |

Rheem and Rinnai sell other things too, so only their searches that name this product count here, like “rheem tankless”.

## Historical estimated branded-search demand

| Month | Brand | Estimated monthly branded searches | Share of Search | Rank |
| --- | --- | --- | --- | --- |
| Oct 2025 | Navien | 74.6K | 68.8% | 1 |
| Oct 2025 | Rheem | 22.2K | 20.5% | 2 |
| Oct 2025 | Noritz | 6.6K | 6.1% | 3 |
| Oct 2025 | Takagi | 2.9K | 2.7% | 4 |
| Oct 2025 | Rinnai | 1.6K | 1.5% | 5 |
| Oct 2025 | EcoSmart | 590 | 0.54% | 6 |
| Nov 2025 | Navien | 74.1K | 71.1% | 1 |
| Nov 2025 | Rheem | 18.1K | 17.4% | 2 |
| Nov 2025 | Noritz | 6.6K | 6.3% | 3 |
| Nov 2025 | Takagi | 2.9K | 2.8% | 4 |
| Nov 2025 | Rinnai | 1.6K | 1.5% | 5 |
| Nov 2025 | EcoSmart | 880 | 0.84% | 6 |
| Dec 2025 | Navien | 74.1K | 64.1% | 1 |
| Dec 2025 | Rheem | 27.1K | 23.4% | 2 |
| Dec 2025 | Noritz | 8.1K | 7% | 3 |
| Dec 2025 | Takagi | 3.6K | 3.1% | 4 |
| Dec 2025 | Rinnai | 1.9K | 1.6% | 5 |
| Dec 2025 | EcoSmart | 880 | 0.76% | 6 |
| Jan 2026 | Navien | 85.6K | 64.4% | 1 |
| Jan 2026 | Rheem | 33.1K | 24.9% | 2 |
| Jan 2026 | Noritz | 8.1K | 6.1% | 3 |
| Jan 2026 | Takagi | 3.6K | 2.7% | 4 |
| Jan 2026 | Rinnai | 1.9K | 1.4% | 5 |
| Jan 2026 | EcoSmart | 720 | 0.54% | 6 |
| Feb 2026 | Navien | 74.6K | 68.7% | 1 |
| Feb 2026 | Rheem | 22.2K | 20.4% | 2 |
| Feb 2026 | Noritz | 6.6K | 6.1% | 3 |
| Feb 2026 | Takagi | 2.9K | 2.7% | 4 |
| Feb 2026 | Rinnai | 1.9K | 1.7% | 5 |
| Feb 2026 | EcoSmart | 390 | 0.36% | 6 |
| Mar 2026 | Navien | 81K | 67.4% | 1 |
| Mar 2026 | Rheem | 27.1K | 22.6% | 2 |
| Mar 2026 | Noritz | 6.6K | 5.5% | 3 |
| Mar 2026 | Takagi | 2.9K | 2.4% | 4 |
| Mar 2026 | Rinnai | 1.9K | 1.6% | 5 |
| Mar 2026 | EcoSmart | 590 | 0.49% | 6 |
| Apr 2026 | Navien | 61K | 58.6% | 1 |
| Apr 2026 | Rheem | 33.1K | 31.8% | 2 |
| Apr 2026 | Noritz | 5.4K | 5.2% | 3 |
| Apr 2026 | Takagi | 2.4K | 2.3% | 4 |
| Apr 2026 | Rinnai | 1.6K | 1.5% | 5 |
| Apr 2026 | EcoSmart | 590 | 0.57% | 6 |
| May 2026 | Navien | 49.8K | 53.7% | 1 |
| May 2026 | Rheem | 33.1K | 35.7% | 2 |
| May 2026 | Noritz | 5.4K | 5.8% | 3 |
| May 2026 | Takagi | 2.4K | 2.6% | 4 |
| May 2026 | Rinnai | 1.6K | 1.7% | 5 |
| May 2026 | EcoSmart | 480 | 0.52% | 6 |
| Jun 2026 | Navien | 49.8K | 67.4% | 1 |
| Jun 2026 | Rheem | 14.8K | 20% | 2 |
| Jun 2026 | Noritz | 5.4K | 7.3% | 3 |
| Jun 2026 | Takagi | 1.9K | 2.6% | 4 |
| Jun 2026 | Rinnai | 1.6K | 2.2% | 5 |
| Jun 2026 | EcoSmart | 390 | 0.53% | 6 |
| Jul 2026 | Navien | 57.2K | 67.2% | 1 |
| Jul 2026 | Rheem | 18.1K | 21.3% | 2 |
| Jul 2026 | Noritz | 5.4K | 6.3% | 3 |
| Jul 2026 | Takagi | 2.4K | 2.8% | 4 |
| Jul 2026 | Rinnai | 1.6K | 1.9% | 5 |
| Jul 2026 | EcoSmart | 390 | 0.46% | 6 |
| Aug 2026 | Navien | 49.8K | 67.2% | 1 |
| Aug 2026 | Rheem | 14.8K | 20% | 2 |
| Aug 2026 | Noritz | 5.4K | 7.3% | 3 |
| Aug 2026 | Takagi | 1.9K | 2.6% | 4 |
| Aug 2026 | Rinnai | 1.6K | 2.2% | 5 |
| Aug 2026 | EcoSmart | 590 | 0.8% | 6 |
| Sep 2026 | Navien | 57.7K | 72.9% | 1 |
| Sep 2026 | Rheem | 12.1K | 15.3% | 2 |
| Sep 2026 | Noritz | 5.4K | 6.8% | 3 |
| Sep 2026 | Takagi | 1.9K | 2.4% | 4 |
| Sep 2026 | Rinnai | 1.6K | 2% | 5 |
| Sep 2026 | EcoSmart | 480 | 0.61% | 6 |

## What is being compared

- **EcoSmart**: Measured on the search term “ecosmart tankless”.
- **Navien**: Measured on the search terms “navien”, “navien tankless” and “navien tankless water heater”, summed into one figure.
- **Noritz**: Measured on the search term “noritz”.
- **Rheem**: Measured on the search term “rheem tankless”.
- **Rinnai**: Measured on the search term “rinnai tankless”.
- **Takagi**: Measured on the search term “takagi tankless”.

- [EcoSmart](/demand/global-en/brands/ecosmart)
- [Navien](/demand/global-en/brands/navien)
- [Noritz](/demand/global-en/brands/noritz)
- [Rheem](/demand/global-en/brands/rheem)
- [Rinnai](/demand/global-en/brands/rinnai)
- [Takagi](/demand/global-en/brands/takagi)

## Methodology

- [How is the Brand Demand Index measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused.

## Frequently asked questions

### Which brand is most popular in search among tankless water heater brands worldwide?

In September 2026, Navien was the most searched among tankless water heater brands worldwide, with an estimated 57.7K branded searches, 72.9% of all searches for the six we track. These are worldwide searches for English-language branded terms.

## Cite this page

Brandwave. "Tankless water heater brands: Which are searched most?". https://gobrandwave.com/demand/global-en/categories/tankless-water-heater-brands

This page is also available as HTML at https://gobrandwave.com/demand/global-en/categories/tankless-water-heater-brands. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.