Top Brands for Tankless Water Heaters: Efficiency Meets Innovation

In an era where energy efficiency and space-saving design are paramount, tankless water heaters have gained immense popularity for their ability to provide hot water on demand without the need for bulky storage tanks. Leading the way in innovation and quality, several brands have carved a niche for themselves in this competitive market. Brands like Rinnai, known for their reliability and range of options, Stiebel Eltron with their eco-friendly designs, and Bosch for their affordable yet efficient models, have consistently received high praise from consumers and experts alike. Interested in discovering which other brands made the list of the best tankless water heaters? Read on to find out more.

Illustration of tankless water heater

Best brands of tankless water heater in 2025

Rinnai

Rinnai is a leading manufacturer of tankless water heaters, known for their high efficiency and innovative features. Their tankless water heaters can last up to 20 years with proper maintenance and are available with Wi-Fi connectivity for remote monitoring and control. Rinnai's models, such as the RE Series, integrate Smart-Circ Intelligent Recirculation and offer advanced condensing technology with a UEF of up to 0.98, making them highly efficient. These heaters are compatible with natural gas and propane, and their compact size allows for installation in small spaces. Rinnai's products are part of a growing market expected to expand significantly, with the global tankless water heater market projected to grow at a CAGR of 8.5% to 8.7% from 2023 to 2030.

Rheem

Rheem Manufacturing Company is a leading global producer of tankless water heaters, known for its innovative and energy-efficient products. For instance, Rheem's Prestige models feature EcoNet Smart Technology, providing Wi-Fi connectivity and additional features that offer system protection, control, and monetary savings. The company's tankless water heaters, such as the Rheem Super High Efficiency IKONIC RTGH-SR11i, boast a 96% efficiency rate and come with a 15-year warranty upon registration. Rheem's products are highly regarded for their durability and space-saving design, making them a preferred choice in both residential and commercial sectors. With a long history dating back to 1925, Rheem continues to innovate and expand its market presence, particularly in regions like North America, which is expected to grow at a CAGR of 10.2% from 2023 to 2030.

EcoSmart

EcoSmart is a leading brand in the tankless water heater market, known for its innovative and energy-efficient products. Founded in 2008 and acquired by Rheem Manufacturing Company in 2016, EcoSmart offers a range of tankless water heaters that can save homeowners up to 50% on their energy bills compared to traditional storage tank water heaters. Their products, such as the ECO 27, feature self-modulating technology, digital temperature control, and a compact design, making them ideal for medium-sized households. EcoSmart's tankless water heaters are also environmentally friendly, producing lower greenhouse gas emissions and boasting high thermal efficiency of up to 96% in their condensing models. With a limited lifetime warranty and various models to suit different needs, EcoSmart stands out as a top choice for those seeking efficient and cost-effective water heating solutions.

Navien

Navien is a leading producer of tankless water heaters, known for their high efficiency and long-lasting components. Founded in 1978 in Seoul, South Korea, Navien has expanded globally, becoming the largest condensing gas water heater manufacturer in North America since 2006. Their tankless water heaters boast a 15-year warranty on the heat exchanger, an efficiency rating of up to 0.97 EF, and both LEED and Energy Star certifications. These units can last up to 25+ years with proper maintenance and are up to 34% more energy-efficient than traditional tank-style gas water heaters. Navien's innovative ComfortFlow® system and Ready-Link® cascading technology further enhance their products' performance and efficiency.

Stiebel Eltron

Stiebel Eltron is a leading manufacturer of tankless water heaters, renowned for its innovative and energy-efficient products. Founded by Dr. Theodor Stiebel in 1924, the company has a century-long history of advancing water heating technology and pioneering energy efficiency. Stiebel Eltron's tankless water heaters, such as the Electric Tankless Water Heater, feature self-modulation technology, ensuring optimal energy savings and a flow rate of 7 GPM, making them suitable for households with medium to high hot water demands. These heaters are up to 24.0% to 34.0% more energy efficient compared to traditional models, according to Energy.gov. The company's commitment to engineering and manufacturing excellence has made it a household name in Europe and a global leader in the tankless water heater market.

Noritz

Noritz is a leading innovator in the tankless water heater industry, having introduced the first modern, electronically controlled tankless water heaters in 1981. The company is renowned for its energy-efficient and high-performance products, with gas tankless water heaters dominating the market with a 65.69% share in North America as of 2022. Noritz's systems are equipped with state-of-the-art technology to deliver on-demand hot water, making them a preferred choice for both residential and commercial applications. Their products are known for their durability, reliability, and versatility, suitable for various uses including RVs. Noritz continues to push the boundaries of efficiency and performance, contributing significantly to the growing demand for tankless water heaters. For more information, you can visit their official website.

Bosch

Bosch, as a leading global supplier of technology and services, is a significant player in the tankless water heater market, known for its innovative and energy-efficient solutions. The company's expertise in sensor technology, software, and services enhances the performance and sustainability of its tankless water heaters. With a global presence and a strong research and development footprint, Bosch contributes to the market's growth, which is expected to expand at a CAGR of 6.3% to 8.7% from 2022 to 2030. Europe, where Bosch has a substantial market share, accounts for around 35.2% of the global tankless water heater market. Bosch's commitment to sustainability and energy efficiency aligns with the increasing demand for eco-friendly products.

Takagi

Takagi is a renowned brand in the tankless water heater market, known for its stylish, eco-friendly, and highly efficient models. Their tankless water heaters boast top-of-the-line safety features, such as overheat cut-off fuses and water temperature controls, ensuring peace of mind for users. With efficiency ratings as high as 95%, Takagi's models are designed to minimize energy consumption and reduce carbon footprint. These heaters are particularly popular for their compact design and ability to match peak flow water requirements, making them ideal for modern homes. Additionally, Takagi's commitment to safety and energy efficiency has contributed to the brand's significant market share in the global tankless water heater market. For more insight into the top tankless water heater brands, visit the Water Heaters Now blog.

Eemax

Eemax is a leading manufacturer of energy-efficient, sustainable, and innovative tankless electric water heaters, boasting a 99% energy efficiency rate and a broad product line that includes solutions for residential, commercial, and industrial applications. Founded in 1988, Eemax has revolutionized the industry with its patented technology, minimizing carbon emissions and delivering continuous hot water at a preset temperature. The company has experienced significant growth, including an 83% increase in sales over six years, prompting a relocation to a larger facility in Waterbury, Conn. Eemax's products are known for their compact size, field-adjustable settings, and ability to save energy, water, and money. With a commitment to providing instant hot water and reducing energy consumption, Eemax stands out as a transformative presence in the market.

A. O. Smith

A. O. Smith is a leading manufacturer of tankless water heaters, renowned for its innovative technology and energy-efficient solutions. With over 140 years of experience, the company has established itself as an industry standard for performance and quality, offering more than 500 different commercial models. A. O. Smith's tankless water heaters are part of a comprehensive line that includes gas-fired, oil-fired, and electric configurations, catering to a wide range of capacities and applications. The company's products, such as the Cyclone(r) Mxi, feature advanced technologies like remote monitoring and master-fit tankless circulating water heaters. A. O. Smith's commitment to innovation has earned it numerous patents and a significant market share in the global tankless water heater market.