JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

We are closed on Friday, July 4th, 2025 for Independence Day weekend and reopening Monday July 7th, 2025. Enjoy and be safe.

Toggle Nav

Search

We ship to most places in continental USA

Chat with us

Need help

Our Locations

Home
Brands
AO Smith
AO Smith Tankless Water Heaters

AO Smith Tankless Water Heaters

AO Smith ATHR-M Tankless Water Heater

Natural Gas
Retail : $2,388.00 $1,910.40

You Save (20%)
AO Smith 100374797 Adapt™ 160 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater
2388.001910.40
160 MBtu
100374797
In Stock

AO Smith 100374798 Adapt™ 180 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater
2656.002124.80
180 MBtu
100374798
In Stock

AO Smith 100374799 Adapt™ 199 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater
2934.002347.20
199 MBtu
100374799
In Stock
Qty:
AO Smith ATHR-X Tankless Water Heater with X3® Scale Prevention Technology

Natural Gas
Retail : $2,644.00 $2,115.20

You Save (20%)
AO Smith 100374800 Adapt™ 160 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
2644.002115.20
160 MBtu
100374800
In Stock

AO Smith 100374811 Adapt™ 180 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
2912.002329.60
180 MBtu
100374811
In Stock

AO Smith 100374812 Adapt™ 199 Input MBtu Premium Condensing Ultra-Low NOx Natural Gas Tankless Water Heater with X3® Scale Prevention Technology
3194.002555.20
199 MBtu
100374812
In Stock
Qty:
AO Smith R4MA 2-Chamber Electric Tankless Water Heater

Electric
In Stock
Retail : $597.48 $477.98

You Save (20%)

Qty:
AO Smith R4MA 4-Chamber Electric Tankless Water Heater

Electric
Retail : $773.14 $618.51

You Save (20%)
AO Smith R4LA-180E 18 Kilowatt 240 Volt 4-Chamber Residential Electric Tankless Water Heater
633.04506.43
18 KW
100293891
In Stock

AO Smith R4LA-240E 24 Kilowatt 240 Volt 4-Chamber Residential Electric Tankless Water Heater
773.14618.51
24 KW
100294820
In Stock

AO Smith R4LA-280E 28 Kilowatt 240 Volt 4-Chamber Residential Electric Tankless Water Heater
999.84799.87
28 KW
R4LA-280E
In Stock

AO Smith R4MA-320E 32 Kilowatt 240 Volt 4-Chamber Residential Electric Tankless Water Heater
1068.36854.69
32 KW
100294797
In Stock
Qty:
AO Smith XP Plus Series Water Heaters (NG)

Natural

Commercial Water Heaters

99% Efficiency

5 Year Heat Exchanger Warranty
Retail : $24,302.00 $17,283.58

You Save (29%)
AO Smith PWH-0400NP XP Plus 399 Input MBtu, 99% AFUE, Circulating, Condensing, Commercial Natural Gas Water Heater with Pump, Indoor, Direct Vent
21191.0015071.04
399 MBtu

AO Smith PWH-0500NP XP Plus 500 Input MBtu 99% AFUE Circulating, Condensing, Commercial Natural Gas Water Heater with Pump, Indoor, Direct Vent
24302.0017283.58
500 MBtu
100348097
In Stock

AO Smith PWH-0650NP XP Plus 650 Input MBtu 98% AFUE, Circulating Condensing, Commercial Natural Gas Water Heater with Pump Indoor, Direct Vent
34038.0024207.83
650 MBtu
Qty:
AO Smith ATI U - Tankless Water Heaters

Natural Gas

Non-Condensing Water Heaters
Retail : $1,362.00 $1,089.60

You Save (20%)
AO Smith ATI-110U-N ProLine® XE Ultra-Low NOx Indoor 140 Input MBtu Non-Condensing Natural Gas Tankless Water Heater
1362.001089.60
140 MBtu
In Stock

AO Smith ATI-510U-N ProLine® XE, 199 Input MBtu, Non-Condensing, Residential Natural Gas/Liquid Propane Tankless Water Heater, Ultra-Low NOx, Direct Vent, Indoor, 15 Year limited Heat Exchanger/5 Year Parts Warranty
2156.001724.80
199 MBtu
In Stock
Qty:
AO Smith ACT - Indoor - Tankless Water Heater

Natural Gas

Condensing Water Heaters

Power Direct Vent

6 Year Heat Exchanger Warranty
Retail : $4,782.00 $3,825.60

You Save (20%)
AO Smith ACT-199I-N ProLine® XE, 199 Input MBtu, Condensing, Commercial Natural Gas Tankless Water Heater, Ultra-Low NOx, Power Direct Vent, Indoor, 6 Year Heat Exchanger/5 Years Parts Warranty
2504.002003.20
199 MBtu
Qty:
AO Smith ATO P - Tankless Water Heaters (NG)

Gas, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $2,808.00 $1,628.64

You Save (42%)
AO Smith ATO-540P-N Tankless Natural Gas Water Heater, 199,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
2808.002246.40
199 MBtu
ATO-540P-N
In Stock
Qty:
AO Smith ATI P - Tankless Water Heater (NG)

Gas, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $2,808.00 $2,246.40

You Save (20%)
AO Smith ATI-540P-N Tankless Natural Gas Water Heater, 199,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
2808.002246.40
199 MBtu
ATI-540P-N
In Stock
Qty:
AO Smith ATO U - Tankless Water Heaters (NG)

Gas, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $1,262.00 $1,009.60

You Save (20%)
AO Smith ATO-110U Tankless Natural Gas Water Heater, 140,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1262.001009.60
140 MBtu
ATO-110U
In Stock

AO Smith ATO-310U-N Tankless Natural Gas Water Heater, 190,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1752.001401.60
190 MBtu
ATO-310U-N
In Stock

AO Smith ATO-510U Tankless Natural Gas Water Heater, 199,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
2156.001724.80
199 MBtu
ATO-510U
Qty:
AO Smith ATI U - Tankless Water Heaters (NG)

Gas, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $1,752.00 $1,401.60

You Save (20%)
AO Smith ATI-310U-N Tankless Natural Gas Water Heater, 190,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1752.001401.60
190 MBtu
ATI-310U-N
In Stock
Qty:
AO Smith ATI H - Tankless Water Heater (NG)

Gas, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $1,580.00 $1,264.00

You Save (20%)
AO Smith ATI-140H-N Tankless Natural Gas Water Heater, 140,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1580.001264.00
140 MBtu
ATI-140H-N
In Stock
Qty:
AO Smith ATO H - Tankless Water Heaters (NG)

Natural Gas

Power Direct Vent
Retail : $2,374.00 $1,376.92

You Save (42%)
AO Smith ATO-240H-N Tankless Natural Gas Water Heater, 160,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1912.001529.60
160 MBtu
ATO-240H-N

AO Smith ATO-340H-N Tankless Natural Gas Water Heater, 180,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
2136.001708.80
180 MBtu
ATO-340H-N

AO Smith ATO-540H-N 199,000 Btu Residential/Commercial Condensing Natural Gas Outdoor Tankless Water Heater, 15 Yr Heat Exc / 5 Pts Warranty
2374.001376.92
199 MBtu
ATO-540H-N
In Stock
Qty:
AO Smith ATI H - Tankless Water Heaters (NG)

Natural Gas

Power Direct Vent
Retail : $2,374.00 $1,899.20

You Save (20%)
AO Smith ATI-240H-N Tankless Natural Gas Water Heater, 160,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1912.001529.60
160 MBtu
ATI-240H-N
In Stock

AO Smith ATI-340H-N Tankless Natural Gas Water Heater, 180000 BTU, Power Direct Vent, 15 Yr Heat Exc / 5 Pts Warranty
2136.001708.80
180 MBtu
ATI-340H-N
In Stock

AO Smith ATI-540H-N Tankless Natural Gas Water Heater, 199000 BTU, Power Direct Vent, 15 Yr Heat Exc / 5 Pts Warranty
2374.001899.20
199 MBtu
ATI-540H-N
In Stock
Qty:
AO Smith ProLine®

Electric

Commercial Water Heater

5 Years Warranty
Out of Stock
Retail : $766.48 $613.18

You Save (20%)

Qty:
AO Smith ProLine Series Electric Water Heaters

Electric

Residential Water Heaters

5 Year Limited Warranty
Out of Stock
Retail : $597.20 $358.32

You Save (40%)

Qty:
AO Smith ATIO - Tankless Water Heater

Natural Gas

Commercial Water Heaters

Direct Vent

80% Efficiency

6 Year Heat Exchanger Warranty
$0.00
AO Smith ATIO-910-N 380 Input MBtu, 80% AFUE, Non-Condensing, Commercial Natural Gas Tankless, Water Heater, Low NOx Direct Vent, Indoor/Outdoor, 6-Year Heat Exchanger/5 Year Parts Warranty
5970.004776.00
380 MBtu
Qty:
AO Smith ATO H - Tankless Water Heaters (LP)

Liquid Propane, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $2,136.00 $1,708.80

You Save (20%)
AO Smith ATO-240H-P Tankless Propane Water Heater, 160,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1912.001529.60
160 MBtu
ATO-240H-P

AO Smith ATO-340H-P Tankless Propane Water Heater, 180,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
2136.001708.80
180 MBtu
ATO-340H-P
Qty:
AO Smith ATI H - Tankless Water Heaters (LP)

Liquid Propane, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $1,912.00 $1,529.60

You Save (20%)
AO Smith ATI-240H-P Tankless Propane Water Heater, 160,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1912.001529.60
160 MBtu
ATI-240H-P

AO Smith ATI-340H-P ATI 180 Input MBtu Liquid Propane Condensing water Heater - Tankless - Power Direct Vent
2136.001708.80
180 MBtu
ATI-340H-P
Qty:
AO Smith ATI H - Tankless Water Heater (LP)

Liquid Propane, Water

Stainless Steel Heat Exchanger

Power Direct Vent
Retail : $1,580.00 $1,264.00

You Save (20%)
AO Smith ATI-140H-P Tankless Propane Water Heater, 140,000 BTU, Power Direct Vent, 15 Yr Heat Exchanger/5 Parts Warranty
1580.001264.00
140 MBtu
ATI-140H-P
Qty:
AO Smith ACI

Gas, Water

Stainless Steel Heat Exchanger
Out of Stock
Retail : $5,660.00 $5,094.00

You Save (10%)

Qty:

Shopping Options

By using this site you agree to our © 2025 AF Supply Corp. All Rights Reserved.