Free shipping on orders over $99
●
Your Zip:
20147
ORDER STATUS
Your Zip:
20147
HELP
MENU
CONTACT & SUPPORT
Live Chat Offline:
Email Us
SIGN IN
0
CART
×
SIGN IN
Shop by Category
Plumbing
Heating
HVAC
Electrical
PEX
Fittings
Valves
Tools
Resources
Our Team
Account
Order History
Returns
Customer Support
Give Us Feedback
Tools
Reorder
Quick Order
Saved Carts
Lists
Resources
PEX Plumbing
PEX Tools
Radiant Heat
Boiler Room
Plumbing Supplies
Air Conditioning
Video Library
Project Calculators
Find Parts For Your Unit
Filters
Hide Filters
65 items
Reset
SORT
Top Sellers
Default
Price ▲
Price ▼
Product Availability
–
Show In Stock Only</strong> Filter (20)
Show
In Stock Only
(20)
Fuel Type
–
Natural Gas Filter (44)
Natural Gas (44)
Propane Filter (21)
Propane (21)
BTU (Max)
–
120,000 Filter (4)
120,000 (4)
140,000 Filter (2)
140,000 (2)
160,000 Filter (11)
160,000 (11)
180,000 Filter (9)
180,000 (9)
190,000 Filter (7)
190,000 (7)
199,000 Filter (14)
199,000 (14)
380,000 Filter (1)
380,000 (1)
398,000 Filter (10)
398,000 (10)
597,000 Filter (2)
597,000 (2)
Energy Factor
–
0.80 - 0.85 Filter (7)
0.80 - 0.85 (7)
0.90 - 0.95 Filter (50)
0.90 - 0.95 (50)
0.95+ Filter (35)
0.95+ (35)
Vent Type
–
Concentric Filter (2)
Concentric (2)
Direct Vent Filter (39)
Direct Vent (39)
Outdoor (No Venting) Filter (16)
Outdoor (No Venting) (16)
Power Vent Filter (6)
Power Vent (6)
Installation Type
–
Indoor Only Filter (34)
Indoor Only (34)
Indoor/Outdoor Filter (1)
Indoor/Outdoor (1)
Outdoor Only Filter (24)
Outdoor Only (24)
Application
–
Commercial Filter (15)
Commercial (15)
Residential Filter (43)
Residential (43)
Includes
–
Gas Conversion Kit Filter (8)
Gas Conversion Kit (8)
Flow Rate At 40F Temp Rise (GPM)
–
5.4 Filter (4)
5.4 (4)
5.8 Filter (2)
5.8 (2)
6.7 Filter (15)
6.7 (15)
7.9 Filter (3)
7.9 (3)
8.0 Filter (3)
8.0 (3)
8.3 Filter (3)
8.3 (3)
9.5 Filter (7)
9.5 (7)
14.8 Filter (1)
14.8 (1)
Flow Rate At 50F Temp Rise (GPM)
–
4.4 Filter (4)
4.4 (4)
4.5 Filter (2)
4.5 (2)
6.1 Filter (15)
6.1 (15)
6.2 Filter (3)
6.2 (3)
6.8 Filter (3)
6.8 (3)
6.9 Filter (3)
6.9 (3)
7.5 Filter (7)
7.5 (7)
12.5 Filter (1)
12.5 (1)
15.2 Filter (10)
15.2 (10)
22.8 Filter (2)
22.8 (2)
Flow Rate At 60F Temp Rise (GPM)
–
3.8 Filter (4)
3.8 (4)
3.9 Filter (2)
3.9 (2)
5 Filter (15)
5 (15)
5.3 Filter (3)
5.3 (3)
5.5 Filter (3)
5.5 (3)
5.7 Filter (3)
5.7 (3)
6.3 Filter (7)
6.3 (7)
10.5 Filter (1)
10.5 (1)
12.6 Filter (10)
12.6 (10)
18.9 Filter (2)
18.9 (2)
Flow Rate At 70F Temp Rise (GPM)
–
3.2 Filter (4)
3.2 (4)
3.3 Filter (2)
3.3 (2)
4.3 Filter (15)
4.3 (15)
4.5 Filter (2)
4.5 (2)
4.8 Filter (7)
4.8 (7)
5.4 Filter (7)
5.4 (7)
8.5 Filter (1)
8.5 (1)
10.8 Filter (10)
10.8 (10)
16.2 Filter (2)
16.2 (2)
Type
–
Condensing Filter (50)
Condensing (50)
Non-Condensing Filter (9)
Non-Condensing (9)
Review Score
–
5 Filter (13)
(13)
4 Filter (2)
(2)
Price Range
–
$80 to $90 Filter (1)
$80 to $90 (1)
$100 to $200 Filter (3)
$100 to $200 (3)
$800 to $900 Filter (7)
$800 to $900 (7)
$1000 to $1500 Filter (21)
$1000 to $1500 (21)
$1500 to $2000 Filter (16)
$1500 to $2000 (16)
$2000 to $2500 Filter (4)
$2000 to $2500 (4)
$3500 to $4000 Filter (1)
$3500 to $4000 (1)
$5000 to $10000 Filter (12)
$5000 to $10000 (12)
Home
Plumbing Supplies
Water Heaters
Tankless Water Heaters
AO Smith Tankless Water Heaters
AO Smith Tankless Water Heaters
Need a little help?
View our Resources
65 items
FILTER
Grid
List
Sort: Top Sellers
Resources
Videos
See all
Types of Water Heaters
Questions?
Closed Now:
Hours
Monday – Thursday
8am–7:45pm
Friday
9am–7:45pm
Saturday – Sunday
9am–5:45pm
Available
9am
Available
9am
Available
9am
Response
by Tue
or check out our
Support Center
ATI-540H-N Compare Checkbox
Compare
199,000 BTU ATI-540H Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
SKU:
ATI-540H-N
AO Smith
SKU:
ATI-540H-N
Brand:
AO Smith
(8)
–
+
$1,269.00
each
ADD TO CART
Add to List
In Stock
Get 25 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 25 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-540H-P Compare Checkbox
Compare
199,000 BTU ATI-540H Condensing Ultra-Low NOx Indoor Tankless Water Heater (LP)
SKU:
ATI-540H-P
AO Smith
SKU:
ATI-540H-P
Brand:
AO Smith
(5)
–
+
$1,394.30
each
ADD TO CART
Add to List
In Stock
Get 31 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 31 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-140H-P Compare Checkbox
Compare
120,000 BTU ATI-140H Condensing Ultra-Low NOx Indoor Tankless Water Heater (LP)
SKU:
ATI-140H-P
AO Smith
SKU:
ATI-140H-P
Brand:
AO Smith
(5)
–
+
$845.00
each
ADD TO CART
Add to List
In Stock
Get 2 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 2 by
Thu, Jan 23
More Available
Inventory Details
Add to List
100209924 Compare Checkbox
Compare
ULN Remote Controller
SKU:
100209924
AO Smith
SKU:
100209924
Brand:
AO Smith
(5)
–
+
$125.72
each
ADD TO CART
Add to List
In Stock
Get 4 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 4 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-140H-N Compare Checkbox
Compare
120,000 BTU ATI-140H Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
SKU:
ATI-140H-N
AO Smith
SKU:
ATI-140H-N
Brand:
AO Smith
(6)
–
+
$848.56
each
ADD TO CART
Add to List
In Stock
Get 23 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 23 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-240H-N Compare Checkbox
Compare
160,000 BTU ATI-240H Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
SKU:
ATI-240H-N
AO Smith
SKU:
ATI-240H-N
Brand:
AO Smith
(6)
–
+
$1,022.00
each
ADD TO CART
Add to List
In Stock
Get 14 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 14 by
Thu, Jan 23
More Available
Inventory Details
Add to List
100112183 Compare Checkbox
Compare
Temperature Remote Controller (TK-RE02)
SKU:
100112183
AO Smith
SKU:
100112183
Brand:
AO Smith
(12)
–
+
$89.88
each
ADD TO CART
Add to List
In Stock
Get 14 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 14 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-340H-N Compare Checkbox
Compare
180,000 BTU ATI-340H Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
SKU:
ATI-340H-N
AO Smith
SKU:
ATI-340H-N
Brand:
AO Smith
(3)
–
+
$1,142.00
each
ADD TO CART
Add to List
In Stock
Get 11 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 11 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-240H-P Compare Checkbox
Compare
160,000 BTU ATI-240H Condensing Ultra-Low NOx Indoor Tankless Water Heater (LP)
SKU:
ATI-240H-P
AO Smith
SKU:
ATI-240H-P
Brand:
AO Smith
(7)
–
+
$1,022.00
each
ADD TO CART
Add to List
In Stock
Get 10 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 10 by
Thu, Jan 23
More Available
Inventory Details
Add to List
100112155 Compare Checkbox
Compare
Temperature Remote Controller (TM-RE30)
SKU:
100112155
AO Smith
SKU:
100112155
Brand:
AO Smith
(2)
–
+
$143.90
each
ADD TO CART
Add to List
In Stock
Get 2 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 2 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-110-U Compare Checkbox
Compare
140,000 BTU ATI-110 Non-Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG/LP)
SKU:
ATI-110-U
AO Smith
SKU:
ATI-110-U
Brand:
AO Smith
(1)
–
+
$845.23
each
ADD TO CART
Add to List
In Stock
Get 1 by
Thu, Jan 23
More Available
Inventory Details
In Stock
Get 1 by
Thu, Jan 23
More Available
Inventory Details
Add to List
ATI-340H-P Compare Checkbox
Compare
180,000 BTU ATI-340H Condensing Ultra-Low NOx Indoor Tankless Water Heater (LP)
SKU:
ATI-340H-P
AO Smith
SKU:
ATI-340H-P
Brand:
AO Smith
(3)
–
+
$1,142.00
each
ADD TO CART
Add to List
In Stock
Get 2 by
Fri, Jan 24
More Available
Inventory Details
In Stock
Get 2 by
Fri, Jan 24
More Available
Inventory Details
Add to List
ATI-510-U Compare Checkbox
Compare