Tankless water heater brands:Which are most popular?

Name: Tankless water heater brands: Which are searched most?
Creator: Brandwave
License: https://creativecommons.org/licenses/by/4.0/

In September 2026, Navien was the most searched tankless water heater brand worldwide, accounting for 72.9% of all searches among the six brands we track. When we checked with ChatGPT and 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 responses that gave a list.

Follow tankless water heater brands and get free monthly updates on what changed

By continuing you'll get index updates and occasional product news from Brandwave. Unsubscribe any time. Privacy

Track your brand in this set →

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.

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.

How many AI answers named each brand
Brand	ChatGPT	Google	Answers that named it
Navien	Named in 2 of 3 ChatGPT answers	Named in 1 of 2 Google AI Overviews	3 of 5
Rheem	Named in 2 of 3 ChatGPT answers	Named in 1 of 2 Google AI Overviews	3 of 5
Rinnai	Named in 2 of 3 ChatGPT answers	Named in 1 of 2 Google AI Overviews	3 of 5
Noritz	Named in 1 of 3 ChatGPT answers	Named in 0 of 2 Google AI Overviews	1 of 5
Takagi	Named in 0 of 3 ChatGPT answers	Named in 0 of 2 Google AI Overviews	0 of 5
EcoSmart	Named in 0 of 3 ChatGPT answers	Named in 0 of 2 Google AI Overviews	0 of 5

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?”
1. 1Rinnai
2. 2Navien
3. 3Rheem
Asked ChatGPT
“Which tankless water heater brand is most reliable?”
1. 1Rinnai
2. 2Noritz
3. 3Navien
4. 4Rheem
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”
1. 1Rinnai
2. 2Navien
3. 3Rheem

Not named in any answer:

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

Which tankless water heater brands do people search for most?

This chart shows how often people search Google for each tankless water heater brand 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 among tankless water heater brands worldwide, by month

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%

Rank	Brand	Share of searches	Estimated monthly branded searches	vs prior month	Share change
1, held 1st	Navien	72.9%	57.7K	+15.9%	+5.7 points
2, held 2nd	Rheem	15.3%	12.1K	-18.2%	-4.7 points
3, held 3rd	Noritz	6.8%	5.4K	0%	-0.5 points
4, held 4th	Takagi	2.4%	1.9K	0%	-0.2 points
5, held 5th	Rinnai	2%	1.6K	0%	-0.1 points
6, held 6th	EcoSmart	0.61%	480	-18.6%	-0.2 points

1.Navien
72.9%
Held 1st. 57.7K estimated branded searches, +15.9% vs prior month. Share +5.7 points.
2.Rheem
15.3%
Held 2nd. 12.1K estimated branded searches, -18.2% vs prior month. Share -4.7 points.
3.Noritz
6.8%
Held 3rd. 5.4K estimated branded searches, 0% vs prior month. Share -0.5 points.
4.Takagi
2.4%
Held 4th. 1.9K estimated branded searches, 0% vs prior month. Share -0.2 points.
5.Rinnai
2%
Held 5th. 1.6K estimated branded searches, 0% vs prior month. Share -0.1 points.
6.EcoSmart
0.61%
Held 6th. 480 estimated branded searches, -18.6% vs prior month. Share -0.2 points.

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

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

6 brands

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%.

Global tankless water heater brands, last 12 months ending September 2026
Brand	Share of searches	Peak	Low	Rank
Navien	68.8% → 72.9%	72.9%Sep 2026	53.7%May 2026	1st
Rheem	20.5% → 15.3%	35.7%May 2026	15.3%Sep 2026	2nd
Noritz	6.1% → 6.8%	7.3%Jun 2026	5.2%Apr 2026	3rd
Takagi	2.7% → 2.4%	3.1%Dec 2025	2.3%Apr 2026	4th
Rinnai	1.5% → 2%	2.2%Jun 2026	1.4%Jan 2026	5th
EcoSmart	0.54% → 0.61%	0.84%Nov 2025	0.36%Feb 2026	6th

Each finding as a sentence

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.

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

5 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%.
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.

How are branded searches counted for tankless water heater brands?

8 search terms

Each brand's share of searches among tankless water heater brands comes from the terms listed under its name. When people mostly search for a brand because of something else it sells, only the searches that name this product count here.