A-o--smith Tankless Water Heaters
Explore A-o--smith’s technology, innovation and top-rated collections
Introduction
- Brand History
- A.O. Smith is a 150-year-old American company founded in 1874, originally manufacturing automotive frames before becoming a leading water heating specialist. The company has been at the forefront of water heating innovation for over a century and is one of the largest water heater manufacturers in North America.
- Reputation
- A.O. Smith is widely recognized as a premium brand in the water heating industry, known for reliability, durability, and innovative technology. The brand enjoys strong trust among contractors, plumbers, and homeowners, consistently ranking high in customer satisfaction surveys.
- Specialization
- While A.O. Smith produces a full range of water heating solutions, their tankless water heaters are engineered with advanced condensing technology, compact designs, and smart connectivity features, focusing on high-efficiency residential and light commercial applications.
Technologies & Innovation
- Proprietary Features
- A.O. Smith tankless units feature advanced condensing technology with stainless steel heat exchangers, modulating gas valves for precise temperature control, and freeze protection systems. Many models include built-in recirculation pumps and advanced venting options.
- Energy Efficiency
- A.O. Smith tankless water heaters achieve up to 0.96 Uniform Energy Factor (UEF) ratings, with ENERGY STAR certified models available. The condensing technology captures and utilizes heat from exhaust gases, maximizing efficiency and reducing operating costs.
- Smart Controls
- Select models feature built-in Wi-Fi connectivity with the A.O. Smith mobile app, allowing remote temperature control, usage monitoring, leak detection alerts, and diagnostic capabilities. Digital displays provide real-time status and maintenance reminders.
- Certifications
- A.O. Smith tankless water heaters are ENERGY STAR certified, meet ANSI Z21.10.3 standards, and comply with Ultra-Low NOx emissions requirements. Many models are certified for both indoor and outdoor installation.
Best Use Cases
- Residential Use
- Ideal for homes with 1-4 bathrooms, particularly effective for families with predictable hot water usage patterns. Excellent for homes seeking space-saving solutions, energy efficiency, and unlimited hot water supply for simultaneous applications.
- Commercial Use
- Well-suited for light commercial applications such as small offices, restaurants, salons, and multi-unit residential buildings. Multiple units can be installed in parallel for higher demand applications.
- Climate Compatibility
- A.O. Smith tankless units perform well in most climates, with outdoor models rated for operation in temperatures as low as -30°F. Indoor models offer flexibility in colder climates with proper venting.
- Installation Types
- Available in both indoor and outdoor models with flexible venting options including direct vent, power vent, and outdoor installation. Compact designs allow installation in tight spaces like closets, basements, or exterior walls.
Why Choose A-o--smith?
- Unique Selling Points
- A.O. Smith offers one of the most comprehensive tankless lineups with models ranging from compact residential units to high-capacity commercial systems. Their advanced condensing technology, smart connectivity, and built-in recirculation options set them apart from competitors.
- Comparative Advantages
- Compared to other brands, A.O. Smith provides superior build quality with stainless steel heat exchangers, longer warranty periods, extensive dealer network for service support, and innovative features like integrated recirculation and smart diagnostics at competitive price points.
- Warranty
- A.O. Smith offers industry-leading warranties with up to 15 years on heat exchanger, 5 years on parts, and 1 year on labor. Extended warranty options are available, and the company's extensive service network ensures reliable warranty support nationwide.
A-o--smith Best Sellers
| Image | Product Name | SKU | List Price | Low Price | Reviews | Rating | Action |
|---|---|---|---|---|---|---|---|
 | A.O. Smith Signature Series 240-Volt 14-KW 1.6-GPM Tankless Electric Water Heater | 8765418685588834278 | — | $349.00 | 65 | 2.9/5 | View Details |
 | A.O. Smith Signature Series Tankless Water Heater | 8278911865008573754 | — | $849.95 | 228 | 4.5/5 | View Details |
 | ZOUXO A.O. Smith Signature Select 8-GPM 190000-BTU Outdoor Natural Gas Tankless Water Heater | 1357283400171844545 | — | $799.99 | 10 | 4.6/5 | View Details |
 | A.O. Smith ATI-540H-N Tankless Water Heater | 1666685042534751399 | — | $1,369.00 | 214 | 4.6/5 | View Details |
 | AO Smith ATI-240H-N Tankless Natural Gas Water Heater 160,000 BTU | 10795696505966311475 | — | $1,021.95 | 203 | 4.7/5 | View Details |
 | A.O. Smith Signature Series 240-Volt 22-KW 4.3-GPM Tankless Electric Water Heater R4LR-220E | 11491991460372348187 | — | $509.39 | /5 | View Details | |
 | A.O. Smith ATI-540P-N 199000 BTU Natural Gas Tankless Water Heater | 15591095164070429088 | — | $1,686.00 | 16 | 4.4/5 | View Details |
 | AO Smith R4LA-240E 24 Kilowatt 240 Volt 4-Chamber Residential Electric Tankless Water Heater | 5628529519541549741 | — | $618.51 | 4 | 1/5 | View Details |
 | A.O. Smith ATI-140H-N Tankless Water Heater | 16702523613067275866 | — | $877.88 | 19 | 4.5/5 | View Details |
 | A.O. Smith ProLine XE Tankless Water Heater | 16093314414661062412 | — | $1,726.70 | 13 | 4.3/5 | View Details |
 | AO Smith Adapt Tankless Water Heater ATHR-199M | 18127490348544347347 | — | $1,779.00 | /5 | View Details | |
 | A.O. Smith ATO-540P 199000 BTU Natural Gas Tankless Water Heater | 5829628496806683751 | — | $1,629.00 | 4 | 4.8/5 | View Details |
 | AO Smith ATI-110-N Tankless Water Heater | 13205772996440064158 | — | $929.89 | 15 | 4.9/5 | View Details |
 | A.o. Smith Signature Premier 8gpm Natural Gas Tankless Water Heater | 2968216935662298161 | — | $949.99 | /5 | View Details | |
 | A. O. Smith 160k Btu Tankless Water Heater | 18385053721915625266 | — | $1,259.62 | 214 | 4.6/5 | View Details |
 | A.O. Smith Signature Series Ultra High Efficiency Tankless Water Heater | 3632065342699596759 | — | $1,889.00 | /5 | View Details | |
 | A.O. Smith X3 Residential 199000 BTU Natural Gas Tankless Water Heater | 10762692190981710005 | — | $1,605.10 | 2 | 4.5/5 | View Details |
 | A.O. Smith Signature Series Tankless Electric Water Heater | 2347660602099718144 | — | $609.00 | 64 | 3.2/5 | View Details |
 | AO Smith UPVA-35K Point-of-Use Commercial Electric Tankless Water Heater | 17169155044729122468 | — | $267.59 | /5 | View Details | |
 | A.O. Smith X3 Tankless Water Heater | 14256187272368954228 | — | $1,334.25 | 1 | 5/5 | View Details |
 | AO Smith ATO-310U Tankless Water Heater | 6059430775157831352 | — | $1,335.02 | 8 | 4.9/5 | View Details |
 | AO Smith ATHR-160X3 Tankless Water Heater | 5080374898408789200 | — | $1,633.85 | /5 | View Details | |
 | A.O. Smith Proline XE 190 MBH Indoor Non-Condensing Natural Gas Tankless Water Heater ATI-310C-N | 7176473292422258750 | — | $1,179.47 | 7 | 1.7/5 | View Details |
 | AO Smith ATO-310U Tankless Water Heater | 17646668538349629510 | — | $1,127.85 | /5 | View Details | |
 | A.O. Smith ProLine XE 199000 BTU Indoor Propane Tankless Water Heater | 16661960154308003711 | — | $1,726.70 | 2 | 5/5 | View Details |
 | A.O. Smith ATI-310-N Tankless Water Heater | 169568470528551610 | — | $1,064.00 | 1 | 5/5 | View Details |
 | A.O. Smith Signature Series Tankless Water Heater | 7644219266996443864 | — | $1,219.99 | 214 | 4.6/5 | View Details |
 | AO Smith Adapt Tankless Water Heater ATHR-199X3 | 3595874406539594917 | — | $1,969.11 | 3 | 5/5 | View Details |
 | AO Smith ATO-110U Tankless Natural Gas Water Heater | 8983811431381582870 | — | $1,009.60 | 6 | 4.8/5 | View Details |
 | A.O. Smith ATI-510U Tankless Water Heater | 1441225968234226368 | — | $1,259.00 | /5 | View Details | |
 | A.O. Smith ATO-540H-N 10 GPM 199000 BTU Natural Gas Tankless | 3726228035029069620 | — | $1,377.00 | 4 | 5/5 | View Details |
 | AO Smith ATI-310U Tankless Water Heater | 6667964738600752507 | — | $1,378.92 | 16 | 4.7/5 | View Details |
 | A. O. Smith Outdoor Condensing High Efficiency 120k Btu Ng Tankless Water Heater | 3594559918082506038 | — | $1,041.39 | 11 | 4.8/5 | View Details |
 | A.O. Smith ATO-510-N Outdoor Natural Gas Tankless Water Heater | 2579953861200147754 | — | $1,303.09 | /5 | View Details | |
 | AO Smith ATO-140H-P 6.6 GPM 120,000 BTU 120 Volt Residential Outdoor Liquid Propane | 2227634213492773446 | — | $917.00 | /5 | View Details | |
 | A.O. Smith X3 Residential Tankless Water Heater | 10457858809319027629 | — | $1,464.95 | /5 | View Details | |
 | Rinnai V75IN Indoor Natural Gas Tankless Water Heater | 2555208968827018180 | — | $899.99 | 133 | 4.3/5 | View Details |
 | A.O. Smith ATO-140H Outdoor Natural Gas Tankless Water Heater | 15865517548131616245 | — | $832.30 | /5 | View Details | |
 | AO Smith ATI-510U Tankless Water Heater | 3503782155488148210 | — | $1,539.99 | 6 | 4.3/5 | View Details |
 | A.O. Smith Signature 100 2.5-Gallon Compact 6-Year Warranty 1440-Watt 1 Element Point | 307638352162186776 | — | $249.00 | 37 | 3.5/5 | View Details |
A-o--smith Collections
EZ Series
Designed for fast and easy tankless upgrades, featuring top-mounted connections that simplify replacement of traditional tank water heaters.
Released: 2019-05-15
Key Features
- High-efficiency condensing (96% UEF)
- 25-year heat exchanger warranty
NRCR Series
Flagship recirculation line with built-in pump providing instant hot water to every fixture.
Released: 2020-11-01
Key Features
- Dual stainless heat exchangers
- Wi-Fi compatibility
- Intelligent recirculation
NRC Series
Dependable condensing units offering high output and excellent thermal efficiency, up to 9.8 GPM.
Released: 2018-08-20
Key Features
- Compact to heavy-duty models
- Long-lasting dual exchanger
ecoTOUGH Series
Eco-friendly line meeting stricter emissions and efficiency standards, ideal for green installs.
Released: 2021-03-10
Key Features
- Low NOx emissions
- ENERGY STAR certified
ProTOUGH Series
Built for contractors with rugged commercial-grade components and extended warranties.
Released: 2022-01-05
Key Features
- Commercial-grade construction
- Extended warranty options
ValueSolutions Series
Budget-friendly, non-condensing models offering reliable performance without premium price.
Released: 2017-06-12
Key Features
- Lower upfront cost
- Proven Noritz quality
NCC Series
Commercial cascade lineup handling up to 199,900 BTU for large-scale hot water demands.
Released: 2019-09-30
Key Features
- Cascadable for higher capacity
- Robust commercial output
NRCB Series
Combination boiler units delivering both space heating and domestic hot water in one compact package.
Released: 2020-07-22
Key Features
- Space heating + DHW
- High efficiency condensing