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Maximum Input Capacity (BTU)
×
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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120000 - 129999 (2)
140000 - 149999 (1)
160000 - 169999 (2)
180000 - 189999 (2)
190000 - 199999 (12)
Vent Type
×
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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Concentric Vent (2)
Direct Vent (13)
Outdoor (No Venting) (4)
Fuel Type
×
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
-
Liquid Propane (7)
Natural Gas (12)
Flow Rate at 40F Temperature Rise (GPM)
×
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.
Learn More
-
5 (3)
6 (2)
7 (1)
8 (4)
9 (9)
Flow Rate at 50F Temperature Rise (GPM)
×
Flow Rate at 50F 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.
Learn More
-
4 (3)
6 (7)
7 (9)
Flow Rate at 60F Temperature Rise (GPM)
×
Flow Rate at 60F 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.
Learn More
-
3 (3)
5 (7)
6 (9)
Flow Rate at 70F Temperature Rise (GPM)
×
Flow Rate at 70F 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.
Learn More
+
3 (3)
4 (7)
5 (9)
Installation Location
+
Indoor (15)
Outdoor (4)
Product Line
+
ProLine (17)
ProLine XE (2)
Product Status
Available (19)
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A.O. Smith ATI-240H - Residential 160,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-240H-N
(11)
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2% Check Discount
$1,022.00
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A.O. Smith ATI-540H - Residential 199,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Model: ATI-540H-P
7%
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(11)
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2% Check Discount
$1,394.00
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Only 1 In-Stock
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A.O. Smith ATI-340H - Residential 180,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-340H-N
7%
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(10)
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2% Check Discount
$1,142.00
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Only 2 In-Stock
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A.O. Smith ATI-140H - Residential 120,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-140H-N
(10)
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$845.00
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A.O. Smith ATI-140H - Residential 120,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Model: ATI-140H-P
(8)
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$845.00
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A.O. Smith ATI-240H - Residential 160,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Model: ATI-240H-P
(8)
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2% Check Discount
$1,022.00
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A.O. Smith ATI-340H - Residential 180,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Model: ATI-340H-P
(8)
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2% Check Discount
$1,142.00
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A.O. Smith ATI-540P - Residential 199,000 BTU - Liquid Propane Tankless Water Heater - Indoor
Model: ATI-540P-P
(6)
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2% Check Discount
$1,650.00
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A.O. Smith ATI-540H - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-540H-N
20%
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(14)
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2% Check Discount
$1,269.00
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In-Stock
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A.O. Smith ATI-540P - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-540P-N
13%
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(8)
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2% Check Discount
$1,501.00
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Only 2 In-Stock
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A.O. Smith ATI-310C - Residential 190,000 BTU - Natural Gas Tankless Water Heater - Concentric Vent
Model: ATI-310C-N
(6)
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$981.00
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A.O. Smith ATI-510C - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-510C-N
(6)
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2% Check Discount
$1,160.00
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A.O. Smith ATI-110U - Residential 140,000 BTU - Natural Gas Tankless Water Heater - Power Vent
Model: ATI-110U-N
(4)
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$845.00
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A.O. Smith ATI-510U - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: ATI-510U-N
(4)
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2% Check Discount
$1,059.00
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A.O. Smith X3 - Residential 199,000 BTU Ultra-Low Nox - Natural Gas Tankless Water Heater with X3 Technology - Indoor
Model: ATI-540HX3-N
7%
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(2)
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2% Check Discount
$1,686.00
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A.O. Smith ATO-540H - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Model: ATO-540H-N
27%
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(2)
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2% Check Discount
$1,269.00
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Only 2 In-Stock
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A.O. Smith ATO-540H - Residential 199,000 BTU - Liquid Propane Tankless Water Heater - Outdoor
Model: ATO-540H-P
20%
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(1)
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2% Check Discount
$1,269.00
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Only 1 In-Stock
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A.O. Smith ATO-540P - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Outdoor
Model: ATO-540P-N
(1)
Q&A
(1)
2% Check Discount
$1,501.00
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A.O. Smith X3 - Residential 199,000 BTU Ultra-Low Nox - Liquid Propane Tankless Water Heater with X3 Technology - Outdoor
Model: ATO-540HX3-P
(1)
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2% Check Discount
$1,558.00
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