Residential Hot Water Heaters

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Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
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Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
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Maximum Input Capacity (BTU) Learn More
Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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Energy Factor Learn More
Energy Factor
Energy Factor (EF) is a measurement of water heater energy efficiency. The higher the energy factor, the more efficient the water heater.
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Flow Rate at 40F Temperature Rise (GPM) Learn More
Flow Rate at 40F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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Learn More About Buderus SST250-65acw-sale-badge
Buderus SST250-65 - 67 Gallon - Indirect Water Heater
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Item#: 37649
Model#: SST250-65
Brand: Buderus
$2,709.00
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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 map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Buderus SST250-65 - 67 Gallon - Indirect Water Heater
Learn More About Buderus SU100/5Wacw-sale-badge
Buderus SU100/5W - 103 Gallon - Indirect Water Heater
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Item#: 37652
Model#: SU100/5W
Brand: Buderus
$3,019.00
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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 map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Buderus SU100/5W - 103 Gallon - Indirect Water Heater
Learn More About Burnham AL27SLacw-sale-badge
Burnham AL27SL - 27 Gallon - Indirect Water Heater
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Item#: 37735
Model#: AL27SL
Brand: Burnham
$1,631.76
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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 map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Burnham AL27SL - 27 Gallon - Indirect Water Heater
Learn More About Burnham AL50SLacw-sale-badge
Burnham AL50SL - 50 Gallon - Indirect Water Heater
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Item#: 37737
Model#: AL50SL
Brand: Burnham
$1,922.84
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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 map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Burnham AL50SL - 50 Gallon - Indirect Water Heater
Learn More About Burnham AL70SLacw-sale-badge
Burnham AL70SL - 70 Gallon - Indirect Water Heater
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Item#: 37738
Model#: AL70SL
Brand: Burnham
$2,503.14
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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 map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Burnham AL70SL - 70 Gallon - Indirect Water Heater
Learn More About Crown Boiler Co. MT040GBRacw-sale-badge
Crown Boiler Co. 40 gal Indirect Water Heater
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Item#: 50214
Model#: MT040GBR
Brand: Crown Boiler Co.
$1,958.00
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Crown Boiler Co. 40 gal Indirect Water Heater
Learn More About Crown Boiler Co. MT050GBRacw-sale-badge
Crown Boiler Co. 50 gal Indirect Water Heater
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Item#: 50215
Model#: MT050GBR
Brand: Crown Boiler Co.
$2,164.00
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Free Lift Gate
*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Crown Boiler Co. 50 gal Indirect Water Heater
Learn More About A.O. Smith ATI-540H-Pacw-sale-badge
A.O. Smith ATI-540H - Residential 199,000 BTU - Liquid Propane Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Ultra-Low NOx. 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 Max BTU/h.
Item#: 61568
Model#: ATI-540H-P
Brand: A.O. Smith
Sale: $1,324.30
On Sale Through 04/30
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A.O. Smith ATI-540H - Residential 199,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-240H-Nacw-sale-badge
A.O. Smith ATI-240H - Residential 160,000 BTU - Natural Gas Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 61572
Model#: ATI-240H-N
Brand: A.O. Smith
$1,022.00
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A.O. Smith ATI-240H - Residential 160,000 BTU - Natural Gas Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-140H-Nacw-sale-badge
A.O. Smith ATI-140H - Residential 120,000 BTU - Natural Gas Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 61575
Model#: ATI-140H-N
Brand: A.O. Smith
$845.00
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A.O. Smith ATI-140H - Residential 120,000 BTU - Natural Gas Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-110U-Nacw-sale-badge
A.O. Smith ATI-110U - Residential 140,000 BTU - Natural Gas Tankless Water Heater - Power Vent
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EnergyStar Water Heater. Ultra Low NOx Emissions. Ratings: 5.8 GPM at 40° F Rise, 4.5 GPM at 50° F Rise, 3.9 GPM at 60° F Rise, 3.3 GPM at 70° F Rise. 140k Effective BTU/h.
Item#: 69978
Model#: ATI-110U-N
Brand: A.O. Smith
$845.00
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A.O. Smith ATI-110U - Residential 140,000 BTU - Natural Gas Tankless Water Heater - Power Vent
Learn More About A.O. Smith ATI-140H-Pacw-sale-badge
A.O. Smith ATI-140H - Residential 120,000 BTU - Liquid Propane Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69979
Model#: ATI-140H-P
Brand: A.O. Smith
$845.00
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A.O. Smith ATI-140H - Residential 120,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-240H-Pacw-sale-badge
A.O. Smith ATI-240H - Residential 160,000 BTU - Liquid Propane Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69980
Model#: ATI-240H-P
Brand: A.O. Smith
$1,022.00
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A.O. Smith ATI-240H - Residential 160,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-310C-Nacw-sale-badge
A.O. Smith ATI-310C - Residential 190,000 BTU - Natural Gas Tankless Water Heater - Concentric Vent
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Item#: 69982
Model#: ATI-310C-N
Brand: A.O. Smith
$981.00
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A.O. Smith ATI-310C - Residential 190,000 BTU - Natural Gas Tankless Water Heater - Concentric Vent
Learn More About A.O. Smith ATI-340H-Pacw-sale-badge
A.O. Smith ATI-340H - Residential 180,000 BTU - Liquid Propane Tankless Water Heater - Indoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69983
Model#: ATI-340H-P
Brand: A.O. Smith
$1,142.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATI-340H - Residential 180,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Learn More About A.O. Smith ATI-510C-Nacw-sale-badge
A.O. Smith ATI-510C - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
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Item#: 69985
Model#: ATI-510C-N
Brand: A.O. Smith
$1,160.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATI-510C - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Learn More About A.O. Smith ATO-140H-Nacw-sale-badge
A.O. Smith ATO-140H - Residential 120,000 BTU - Natural Gas Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69991
Model#: ATO-140H-N
Brand: A.O. Smith
$845.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-140H - Residential 120,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-140H-Pacw-sale-badge
A.O. Smith ATO-140H - Residential 120,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69992
Model#: ATO-140H-P
Brand: A.O. Smith
$845.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-140H - Residential 120,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-240H-Nacw-sale-badge
A.O. Smith ATO-240H - Residential 160,000 BTU - Natural Gas Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69993
Model#: ATO-240H-N
Brand: A.O. Smith
$1,022.00
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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 map apply, see our full shipping policy for more details.
In-Stock
A.O. Smith ATO-240H - Residential 160,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-240H-Pacw-sale-badge
A.O. Smith ATO-240H - Residential 160,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69994
Model#: ATO-240H-P
Brand: A.O. Smith
$1,022.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-240H - Residential 160,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-340H-Nacw-sale-badge
A.O. Smith ATO-340H - Residential 180,000 BTU - Natural Gas Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69998
Model#: ATO-340H-N
Brand: A.O. Smith
$1,142.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-340H - Residential 180,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-340H-Pacw-sale-badge
A.O. Smith ATO-340H - Residential 180,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
Write A Review
EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 69999
Model#: ATO-340H-P
Brand: A.O. Smith
$1,142.00
Free Shipping
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-340H - Residential 180,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
Learn More About A.O. Smith ATO-540H-Nacw-sale-badge
A.O. Smith ATO-540H - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Outdoor
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EnergyStar Condensing Water Heater. Low NOx Emissions. 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.
Item#: 70002
Model#: ATO-540H-N
Brand: A.O. Smith
$1,269.00
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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 map apply, see our full shipping policy for more details.
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A.O. Smith ATO-540H - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Learn More About A.O. Smith Tank GDHE-50acw-sale-badge
A.O. Smith GDHE-50 - 50 Gallon Capacity - Residential Natural Gas Tank Water Heater - Direct Vent
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129 GPH Continuous Recovery Rate at 90
Item#: 70003
Model#: GDHE-50
Brand: A.O. Smith Tank
$4,126.00
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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 map apply, see our full shipping policy for more details.
Free Lift Gate
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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A.O. Smith GDHE-50 - 50 Gallon Capacity - Residential Natural Gas Tank Water Heater - Direct Vent