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A. O. Smith Manuals & User Guides

A. O. Smith is a leading global manufacturer of residential and commercial water heating equipment and water treatment products, known for innovation and efficiency.

Tip: include the full model number printed on your A. O. Smith label for the best match.

About A. O. Smith manuals on Manuals.plus

A. O. Smith Corporation is a premier manufacturer of water heating and water treatment solutions for residential, commercial, and industrial applications. Founded in 1874, the company has grown into a global leader, delivering innovative technologies that provide hot water and clean drinking water to millions of customers worldwide. Their extensive product portfolio includes gas and electric water heaters, tankless systems, heat pump water heaters, and boilers.

In addition to water heating, A. O. Smith is a trusted name in water filtration and treatment, offering whole-house filtration systems, reverse osmosis units, and water softeners under its own name and subsidiary brands such as Aquasana and Hague Quality Water. The company emphasizes sustainability and energy efficiency, developing high-efficiency products that meet stringent environmental standards like ENERGY STAR® certifications.

A. O. Smith manuals

Latest manuals from manuals+ curated for this brand.

AO Smith ELJH-30 Storage Water Heater User Guide

August 13, 2026
AO Smith ELJH-30 Storage Water Heater About A.O. Smith A. O. Smith Water Products Company is the largest water heater manufacturer in the world, a global leader in innovative technology…

EWS-3_3K

application/pdf
EWS-3_3K, A. O. Smith,A. O. Smith India Water Products Pvt. Ltd., A.O. Smith India Water Products Pvt. Ltd. Plot No. 300, Phase - 2, KIADB Industrial Area, Harohalli, Karnataka 562112;…

‎FE6001F

application/pdf
‎FE6001F, A.O. Smith,‎Century Electric/AO Smith Motors Co,A.O.,Smith,FE6001F,1/3-1/5,HP,825,RPM,208/230,volts,1.9,Amps,48Y,Frame,Ball,Bearing,Condenser,Motor,,

AO-US-200-R

application/pdf
AO-US-200-R, AO Smith,AO Smith,AO,Smith,Claryum,Filter,Replacement,2,Pack,AO-US-200-R,2,Count,(Pack,of,1),B0F79P67B2,B07NJ4P99G,B07PWNK3M4

40 High Efficiency Condensing Gas Solar

Instruction Manual
40 High Efficiency Condensing Gas Solar, 40, High Efficiency Condensing Gas Solar, Efficiency Condensing Gas Solar, Condensing Gas Solar, Gas Solar, Solar

100375319 Hybrid Electric Heat Pump Water Heater

User Guide
100375319 Hybrid Electric Heat Pump Water Heater, 100375319, Hybrid Electric Heat Pump Water Heater, Electric Heat Pump Water Heater, Heat Pump Water Heater, Pump Water Heater, Water Heater, Heater

100114362 Residential Gas Water Heater with Flammable

User Guide
100114362, 100365357_2000621411_REV.A, 100114362 Residential Gas Water Heater with Flammable, 100114362, Residential Gas Water Heater with Flammable, Gas Water Heater with Flammable, Water Heater with Flammable, Heater with Flammable, Flammable

Polaris 28 Residential Tank Type Water Heaters

Owner's Manual
Polaris 28, Powered by Takagi 30, Adapt Tankless 32, Polaris 28 Residential Tank Type Water Heaters, Polaris 28, Residential Tank Type Water Heaters, Tank Type Water Heaters, Type Water Heaters,…

A. O. Smith manuals from online retailers

A. O. Smith support FAQ

Common questions about manuals, registration, and support for this brand.

  • How often should I replace the filter cartridges in my A. O. Smith RO system?

    It is generally recommended to replace the filter cartridges as per the specific model's guidelines, typically every 6 months to a year, or when you notice a decrease in water flow or quality.

  • What should I do if my A. O. Smith water heater displays an error code?

    Refer to the error code list in your specific owner's manual for troubleshooting steps. Common codes indicate issues like gas supply interruptions, flame sensor problems, or airflow blockages.

  • How do I adjust the water temperature on my A. O. Smith water heater?

    Use the digital display or the Temperature Regulation Control (TRC) knob on the unit to set your desired temperature. Consult your manual for the recommended safety settings to prevent scalding.

  • Can I use tools to tighten the filter sumps on my water filtration system?

    No, it is advised to hand-tighten filter housings to prevent damaging the O-rings or cracking the housing. Use the provided plastic wrench only for loosening if necessary.

  • What is the warranty period for A. O. Smith water heaters?

    Warranty periods vary by model and component (e.g., tank vs. parts). Residential models often have 6 to 10-year minimal warranties, while commercial units vary. Check your specific model's documentation or the A. O. Smith website for details.