A.O. Smith Tankless Water Heaters

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Model Number ATI-240H-N is the Number 1 Seller
Learn More About A.O. Smith ATI-240H-N
A.O. Smith
A.O. Smith ATI-240H - 5.0 GPM at 60° F Rise - 0.94 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-240H-N
25% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(11)
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$889.00
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Model Number ATI-540H-P is the Number 2 Seller
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A.O. Smith
A.O. Smith ATI-540H - 6.3 GPM at 60° F Rise - 0.93 UEF - Propane Tankless Water Heater - Direct Vent
Model: ATI-540H-P
13% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(10)
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$1,139.00
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Model Number ATI-310C-N is the Number 3 Seller
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A.O. Smith
A.O. Smith ATI-310C - 5.3 GPM at 60° F Rise - 0.82 UEF - Gas Tankless Water Heater - Concentric Vent
Model: ATI-310C-N
13% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(6)
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$889.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Model Number ATI-110U-N is the Number 4 Seller
Learn More About A.O. Smith ATI-110U-N
A.O. Smith
A.O. Smith ATI-110U - 3.9 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Power Vent
Model: ATI-110U-N
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.8 GPM at 40
13% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(4)
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$719.00
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Model Number ATI-540H-N is the Number 5 Seller
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A.O. Smith
A.O. Smith ATI-540H - 6.3 GPM at 60° F Rise - 0.93 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-540H-N
6% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(14)
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$1,139.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About A.O. Smith ATI-140H-N
A.O. Smith
A.O. Smith ATI-140H - 3.8 GPM at 60° F Rise - 0.90 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-140H-N
6% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(10)
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$749.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About A.O. Smith ATI-340H-N
A.O. Smith
A.O. Smith ATI-340H - 5.7 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-340H-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 8.0 GPM at 40° F Rise, 6.8 GPM at 50° F Rise, 5.7 GPM at 60° F Rise, 4.8 GPM at 70° F Rise. 171k Effective BTU/h.
6% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(10)
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$1,029.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About A.O. Smith ATI-140H-P
A.O. Smith
A.O. Smith ATI-140H - 3.8 GPM at 60° F Rise - 0.90 UEF - Propane Tankless Water Heater - Direct Vent
Model: ATI-140H-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 5.4 GPM at 40° F Rise, 4.4 GPM at 50° F Rise, 3.8 GPM at 60° F Rise, 3.2 GPM at 70° F Rise. 112k Effective BTU/h.
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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$749.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About A.O. Smith ATI-540P-P
A.O. Smith
A.O. Smith ATI-540P - 6.3 GPM at 60° F Rise - 0.93 UEF - Propane Tankless Water Heater - Direct Vent
Model: ATI-540P-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 189k Effective BTU/h.
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(6)
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$1,349.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About A.O. Smith ATO-540H-P
A.O. Smith
A.O. Smith ATO-540H - 6.3 GPM at 60° F Rise - 0.95 UEF - Propane Tankless Water Heater - Outdoor
Model: ATO-540H-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 189k Effective BTU/h.
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$1,099.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About A.O. Smith ATI-540P-N
A.O. Smith
A.O. Smith ATI-540P - 6.3 GPM at 60° F Rise - 0.93 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-540P-N
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(8)
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$1,349.00
Only 1 In-Stock
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About A.O. Smith ATI-510C-N
A.O. Smith
A.O. Smith ATI-510C - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Concentric Vent
Model: ATI-510C-N
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(6)
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$953.10
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$1,059.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About A.O. Smith ATO-540P-N
A.O. Smith
A.O. Smith ATO-540P - 6.3 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-540P-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 199k Effective BTU/h.
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$1,299.00
Only 4 In-Stock
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATO-540P-P
A.O. Smith
A.O. Smith ATO-540P - 6.3 GPM at 60° F Rise - 0.95 UEF - Propane Tankless Water Heater - Outdoor
Model: ATO-540P-P
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$1,299.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATO-140H-N
A.O. Smith
A.O. Smith ATO-140H - 3.8 GPM at 60° F Rise - 0.91 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-140H-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 5.4 GPM at 40° F Rise, 4.4 GPM at 50° F Rise, 3.8 GPM at 60° F Rise, 3.2 GPM at 70° F Rise. 112k Effective BTU/h.
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$769.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About A.O. Smith ATO-240H-N
A.O. Smith
A.O. Smith ATO-240H - 5.0 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-240H-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 6.7 GPM at 40° F Rise, 6.1 GPM at 50° F Rise, 5.0 GPM at 60° F Rise, 4.3 GPM at 70° F Rise. 171k Effective BTU/h.
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$929.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About A.O. Smith ATO-340H-N
A.O. Smith
A.O. Smith ATO-340H - 5.7 GPM at 60° F Rise - 0.94 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-340H-N
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$1,049.00
Only 3 In-Stock
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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2% Check Discount
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2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATO-340H-P
A.O. Smith
A.O. Smith ATO-340H - 5.7 GPM at 60° F Rise - 0.94 UEF - Propane Tankless Water Heater - Outdoor
Model: ATO-340H-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 8.0 GPM at 40° F Rise, 6.8 GPM at 50° F Rise, 5.7 GPM at 60° F Rise, 4.8 GPM at 70° F Rise. 171k Effective BTU/h.
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$1,049.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATO-540H-N
A.O. Smith
A.O. Smith ATO-540H - 6.3 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-540H-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 189k Effective BTU/h.
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$1,099.00
Only 3 In-Stock
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATO-310U-N
A.O. Smith
A.O. Smith ATO-310U - 5.3 GPM at 60°F Rise - 0.82 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-310U-N
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.9 GPM at 40
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$999.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
Add To Cart
Learn More About A.O. Smith ATO-510U-N
A.O. Smith
A.O. Smith ATO-510U - 5.5 GPM at 60°F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-510U-N
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.3 GPM at 40
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$1,049.00
Factory-Direct
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATI-240H-P
A.O. Smith
A.O. Smith ATI-240H - 5.0 GPM at 60° F Rise - 0.94 UEF - Propane Tankless Water Heater - Direct Vent
Model: ATI-240H-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 6.7 GPM at 40° F Rise, 6.1 GPM at 50° F Rise, 5.0 GPM at 60° F Rise, 4.3 GPM at 70° F Rise. 152k Effective BTU/h.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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$889.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
Add To Cart
Learn More About A.O. Smith ATI-340H-P
A.O. Smith
A.O. Smith ATI-340H - 5.7 GPM at 60° F Rise - 0.95 UEF - Propane Tankless Water Heater - Direct Vent
Model: ATI-340H-P
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 8.0 GPM at 40° F Rise, 6.8 GPM at 50° F Rise, 5.7 GPM at 60° F Rise, 4.8 GPM at 70° F Rise. 171k Effective BTU/h.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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$1,029.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
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2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About A.O. Smith ATI-310U-N
A.O. Smith
A.O. Smith ATI-310U - 5.3 GPM at 60°F Rise - 0.82 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-310U-N
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.9 GPM at 40
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(4)
Q&A (1)
$999.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Tools & Articles
Tankless Water Heater Buying Guide
How to Pick the Perfect Tankless Water Heater
Tankless Water Heater Sizing Guide
What Size Tankless Water Heater Do I Need
A.O. Smith tankless water heaters use either natural gas or liquid propane and can be installed indoors or outdoors. The main benefits of A.O Smith tankless hot water heaters include space savings, reduced energy and water consumption, and a continous supply of hot water that isn't limited by a storage tank.