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
HVAC
Water Heaters
Natural Gas Water Heaters

Natural Gas Water Heaters

Shop by Brands arrow_down

arrow_down

Rheem

Hudson

HTP

Bock

Bosch

Lochinvar

Burnham

DHT

Heat-flo

Weil-McLain

Triangle Tube

Turbomax

Utica

Amtrol

Peerless Boilers

Peerless Boilers

John Wood

Williamson

Green Mountain

Eemax

Water Heater Type arrow_down

arrow_down

Residential

Commercial

Indirect

Tank

Tankless

Point of Use

Shop By Fuel Type arrow_down

arrow_down

Electric

Natural Gas

Propane

Oil

Rheem Triton GHE100SU

Natural Gas

97% Efficiency
Retail : $14,684.00 $11,013.00

You Save (25%)
Rheem GHE100SU-200 Triton® 200 MBtu 100 Gallon High-Efficiency Commercial Natural Gas Tank Water Heater
14684.0011013.00
200 MBtu
In Stock

Rheem GHE100SU-400 Triton® 400 MBtu 100 Gallon High-Efficiency Commercial Natural Gas Tank Water Heater
23459.0017594.25
400 MBtu
In Stock
Qty:
AO Smith Polaris™

Natural Gas

0.96 Efficiency

Yes
Retail : $9,426.00 $5,949.69

You Save (37%)
AO Smith GSP-130 Polaris™ 34-Gallon Power Direct Vent Natural Gas Water Heater
9426.005949.69
34 Gallons
In Stock
Qty:
AO Smith Cyclone® XL

Natural Gas

0.97 Efficiency

Yes
Retail : $33,353.11 $33,352.11
AO Smith 100314528 BTHS750 Cyclone® XL 120-Gallons High Efficiency, Condensing Natural Gas Water Heater with Modulating Burner
33353.1133352.11
120 Gallons
In Stock
Qty:
Laars U.H.E. Series Natural Gas Water Heater
In Stock
Retail : $22,872.00 $17,154.00

You Save (25%)

Qty:
Rheem Professional Classic®

Natural Gas

Residential

Power Vent

64 Gallons
Retail : $2,866.00 $2,006.20

You Save (30%)
Rheem PROG40S-36N RH67 PV Professional Classic® 40 Gallons Short Residential Natural Gas Water Heater - Power Vent
2866.002006.20
40 Gallons
64 Gallons
In Stock

Rheem PROG50S-36N RH67 PV Professional Classic® 50 Gallons Short Residential Natural Gas Water Heater - Power Vent
3232.002262.40
50 Gallons
78 Gallons
PROG50S-36N
Qty:
State Water Heaters ProLine® XE

Natural Gas

Residential Water Heater

Power Vent

70% Efficiency

93 Gallons

6 Years Warranty
In Stock
Retail : $2,498.50 $1,577.05

You Save (37%)

Qty:
Lochinvar Copper-Fin Natural Gas Water Heater

Natural Gas

Commercial Water Heater
Retail : $7,384.00 $4,585.46

You Save (38%)
Lochinvar CWN0315PM Copper-Fin 315 Input MBtu Commercial Natural Gas Water Heater
6510.004042.71
315 MBtu
CWN0315PM
Qty:
Rheem Classic Series - Short - Water Heaters (NG)

Gas, Water

Residential

87 Gallon
Retail : $1,678.00 $1,174.60

You Save (30%)
Rheem PROG30S-30N RH63 Professional Classic® 30 Gallon Short Residential Natural Gas Water Heater - Atmospheric Vent
1542.001079.40
30 Gallons
PROG30S-30N RH63

Rheem PROG40S-34N RH62 Professional Classic® 40 Gallon Short Residential Natural Gas Water Heater - Atmospheric Vent
1506.001054.20
40 Gallons
PROG40S-34N RH62

Rheem PROG50S-40N RH61 Professional Classic® 50 Gallon Short Residential Natural Gas Water Heater - Atmospheric Vent
1678.001174.60
50 Gallons
87 Gallon
In Stock
Qty:
Lochinvar Armor® Natural Gas Water Heater - Direct Vent (Pump Supplied)

Natural Gas

Stainless Steel Heat Exchanger

99% Efficiency
Retail : $26,246.00 $18,579.54

You Save (29%)
Lochinvar AWH0400N-PM Armor® 399 Input MBtu 99% AFUE - Commercial Natural Gas Condensing Water Heater - Direct Vent (Pump Supplied)
22886.0016201.00
399 MBtu

Lochinvar AWH0500N-PM Armor® 500 Input MBtu 99% AFUE - Commercial Natural Gas Condensing Water Heater - Direct Vent (Pump Supplied)
26246.0018579.54
500 MBtu
In Stock

Lochinvar AWH0800N-PM Armor® 800 Input MBtu 98% AFUE - Commercial Natural Gas Condensing Water Heater - Direct Vent (Pump Supplied)
42567.0030133.18
800 MBtu
Qty:
Hudson GSN - Lowboy - Low NOx Water Heaters

Natural Gas

Residential Water Heater

82 Gallons

6 Year Warranty
Retail : $1,121.57 $807.53

You Save (28%)
Hudson GSN40L-2-3-6 40 Gallon LowBoy Natural Gas Water Heater - 6 Year Warranty
898.37646.83
40 Gallons
71 Gallons
GSN40L-2-3-6

Hudson GSN50L-2-3-6 Gallon LowBoy Natural Gas Water Heater - 6 Year Warranty
1121.57807.53
50 Gallons
82 Gallons
GSN50L-2-3-6
In Stock
Qty:
Hudson GSN - Low NOx Water Heaters

Natural Gas

Residential Water Heater

84 Gallons

6 Year Warranty
Retail : $989.87 $712.71

You Save (28%)
Hudson GSN40T-1-3-6 40 Gallon Natural Gas Water Heater - 6 Year Warranty
876.18630.85
40 Gallons
69 Gallons
GSN40T-1-3-6
In Stock

Hudson GSN50T-1-3-6 50 Gallon Natural Gas Water Heater - 6 Year Warranty
989.87712.71
50 Gallons
84 Gallons
GSN50T-1-3-6
In Stock
Qty:
Rheem Classic Plus Series - Short - Power Damper Water Heaters

Natural Gas

Residential Water Heater

Powered Damper

69 Gallons

8 Year Warranty

Energy Star
Retail : $1,876.00 $1,313.20

You Save (30%)
Rheem PRO+G40S-40N RH67 PD Classic Plus 40 Gallon Residential Low Nox Natural Gas Water Heater - Powered Damper - 8 Year Warranty
1876.001313.20
40 Gallons
PRO+G40S-40N RH67 PD
In Stock
Qty:
Rheem Medium Duty - Water Heaters

Natural Gas

Medium Duty Water Heater

182 Gallons

3 Year Warranty
Retail : $4,467.00 $3,350.25

You Save (25%)
Rheem G75-75N-3 Medium Duty 75 Gallon, 75 Input MBtu Natural Gas Commercial Water Heater - 3 Year Warranty
4467.003350.25
75 Gallons
182 Gallons
G75-75N-3
In Stock

Rheem G100-80 Medium Duty 100 Gallon, 80 Input MBtu Commercial Natural Gas Water Heater - 3 Year Warranty
5830.004372.50
100 Gallons
194 Gallons
G100-80
In Stock
Qty:
Rheem Universal Series - Standard Vent - Water Heaters

Natural Gas

Commercial Water Heater

Standard Vent

80% Efficiency

303 Gallons

3 Year Warranty

Energy Star
Retail : $9,616.00 $7,212.00

You Save (25%)
Rheem G37-200 Universal 35 Gallon, 199 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
13733.0010299.75
35 Gallons
485 Gallons
G37-200

Rheem G65-360 Universal 65 Gallon, 360 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
19034.0014275.50
65 Gallons
873 Gallons
G65-360

Rheem G72-300 Universal 72 Gallon, 300 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
15589.0011691.75
72 Gallons
727 Gallons
G72-300

Rheem G75-125 Universal 75 Gallon, 125 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
9616.007212.00
75 Gallons
303 Gallons
G75-125
In Stock

Rheem G82-156 Universal 82 Gallon, 156 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
12035.009026.25
82 Gallons
378 Gallons
G82-156
In Stock

Rheem G91-200 Universal 91 Gallon, 199 Inptu MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
11161.008370.75
91 Gallons
485 Gallons
G91-200

Rheem G100-400 Universal 100 Gallon, 399 Input MBtu - 80% AFUE - Commercial Natural Gas Water Heater - Standard Vent - 3 Year Warranty
17733.0013299.75
100 Gallons
969 Gallons
G100-400
Qty:
Rheem Classic Plus Series - Tall - Water Heaters

Natural Gas

Heavy Duty Water Heater

80% Efficiency

100 Gallons

8 Year Warranty
Retail : $2,688.00 $1,881.60

You Save (30%)
Rheem PRO+G75-76N RH Classic Plus 75 Gallon - 80% AFUE - Tall Residential Natural Gas Water Heater - 8 Year Warranty
2688.001881.60
75 Gallons
100 Gallons
PRO+G75-76N RH
In Stock

Rheem PRO+G98-76N RH Classic Plus 98 Gallon - 80% AFUE - Tall Residential Natural Gas Water Heater - 8 Year Warranty
5520.003864.00
98 Gallons
142 Gallons
PRO+G98-76N RH
In Stock
Qty:
Rheem Classic Plus Series - Tall - Power Vent Water Heaters

Natural Gas

Residential Water Heater

Power Vent

110 Gallons

8 Year Warranty
Retail : $4,616.00 $3,231.20

You Save (30%)
Rheem PRO+G75-76N RH PV Classic Plus 75 Gallon - 80% AFUE - Residential Natural Gas Low Nox Water Heater - Power Vent - 8 Year Warranty
4616.003231.20
75 Gallons
PRO+G75-76N RH PV
Qty:
Rheem Classic Plus Series - Side Water Connections Water Heaters

Natural Gas

Residential Water Heater

Atmospheric Vent

105 Gallons

8 Year Warranty
Retail : $2,744.00 $1,920.80

You Save (30%)
Rheem PRO+G48-60N RH60 Classic Plus 48 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 8 Year Warranty
2744.001920.80
48 Gallons
105 Gallons
PRO+G48-60N RH60
In Stock

Rheem PRO+G55-50N RH59 Classic Plus 55 Gallon Tall Residential Natural Gas water Heater - Atmospheric Vent - 8 Year Warranty
2906.002034.20
55 Gallons
91 Gallons
PRO+G55-50N RH59
Qty:
Rheem Classic Series -Tall Power Vent Water Heaters

Natural Gas

Residential Water Heater

Power Vent

78 Gallons

6 Year Warranty

Energy Star
Retail : $3,232.00 $2,262.40

You Save (30%)
Rheem PROG40-40N RH67 PV Classic 40 Gallon Tall Residential Natural Gas Water Heater - Power Vent - 6 Year Warranty
2866.002006.20
40 Gallons
86 Gallons
PROG40-40N RH67 PV
In Stock

Rheem PROG50-42N RH67 PV Classic 50 Gallon Tall Residential Natural Gas Water Heater - Power Vent - 6 Year Warranty
3232.002262.40
50 Gallons
78 Gallons
PROG50-42N RH67 PV
In Stock
Qty:
Rheem Classic Series - Tall Water Heaters

Natural Gas

Residential Water Heater

Atmospheric Vent

64 Gallons

6 Year Warranty
Retail : $1,432.00 $1,002.40

You Save (30%)
Rheem PROG29-32N RH63 Classic 29 Gallon Residential Natural Gas Water Heater - Atmospheric Vent - 6 Year Warranty
1542.001079.40
29 Gallons
63 Gallons
PROG29-32N RH63
In Stock

Rheem PROG40-38N RH62 Classic 40 Gallon Residential Natural Gas Water Heater - Atmospheric Vent - 6 Year Warranty
1432.001002.40
40 Gallons
64 Gallons
PROG40-38N RH62
In Stock

Rheem PROG50-38N RH60 Classic 50 Gallon Residential Natural Gas Water Heater - Atmospheric Vent - 6 Year Warranty
1650.001155.00
50 Gallons
85 Gallons
PROG50-38N RH60
In Stock
Qty:
AO Smith ProLine Series - Tall Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

78 Gallon

6 Year Warranty
Retail : $1,486.00 $937.96

You Save (37%)
AO Smith GCB-30 Proline 30 Gallon Tall Residential Liquid Propane Water Heater - Atmoshperic Vent - 6 Year Warranty
1674.001056.63
30 Gallons
69 Gallons
GCB-30

AO Smith 100158802 GCB-40 Proline 40 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 6 Year Warranty
1486.00937.96
40 Gallons
78 Gallon
100158802
In Stock
Qty:
AO Smith Cyclone Xi Series - BTX - Water Heaters

Natural Gas

Commercial Water Heater

3 Year Warranty
Retail : $6,065.00 $5,458.50

You Save (10%)
AO Smith BTX-80 Cyclone 50 Gallon, 76 Input MBtu- 90% AFUE - Commercial Natural Gas Water Heater - Power Vent - 3 Year Warranty
4205.003784.50
76 MBtu
127 Gallons
BTX-80

AO Smith BTX-100 Cyclone 50 Gallon, 100 Input MBtu - 96% AFUE - Commercial Natural Gas Water Heater - Power Direct Vent - 3 Year Warranty
6065.005458.50
100 MBtu
BTX-100
In Stock
Qty:
AO Smith ProMax Series - Tall - Eco-Friendly Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

99 Gallons

10 Year Warranty
Retail : $2,766.00 $1,745.90

You Save (37%)
AO Smith 100191338 GCRX-50 Promax 50 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 10 Year Warranty
2766.001745.90
50 Gallons
99 Gallons
100191338
In Stock

AO Smith GCRX-55 Promax 55 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 10 Year Warranty
2982.001882.24
55 Gallons
99 Gallons
XCRX-55
Qty:
AO Smith ProLine Series - Tall - XCR Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

84 Gallon

10 Year Warranty
Retail : $1,864.00 $1,176.56

You Save (37%)
AO Smith 100325957 XCR-30 Proline 30 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 10 Year Warranty
1838.001160.15
30 Gallons
62 Gallon
XCR-30
In Stock

AO Smith 100191157 XCR-40 Proline 40 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 10 Year Warranty
1650.001041.48
40 Gallons
80 Gallon
XCR-40
In Stock

AO Smith 100191211 XCR-50 Proline 50 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 10 Year Warranty
1864.001176.56
50 Gallons
84 Gallon
XCR-50
In Stock
Qty:
AO Smith ProLine Series - Tall - GCR Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

80 Gallon

6 Year Warranty
Retail : $1,432.00 $903.88

You Save (37%)
AO Smith 100325924 GCR-30 Proline 30 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 6 Year Warranty
1620.001022.54
30 Gallons
62 Gallon
100325924
In Stock

AO Smith 100187988 GCR-40 Proline 40 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 6 Year Warranty
1432.00903.88
40 Gallons
80 Gallon
100187988
In Stock

AO Smith 100218006 GCR-50 Proline 50 Gallon Tall Residential Natural Gas Water Heater - Atmoshperic Vent - 6 Year Warranty
1646.001038.96
50 Gallons
84 Gallon
100218006
In Stock
Qty:
AO Smith ProMax Series - GCRT Water Heaters

Natural Gas

Residential Water Heater

Atmospheric Vent

89 Gallons

6 Year Warranty
Retail : $1,816.00 $1,146.26

You Save (37%)
AO Smith 100191259 GCRT-50 ProLine 50 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 6 Year Warranty
1816.001146.26
50 Gallons
GCRT-50
In Stock
Qty:
AO Smith ProLine Series - GCG Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

81 Gallons

6 Year Warranty
Retail : $1,620.00 $1,022.54

You Save (37%)
AO Smith 100191291 GCG-50 ProLine 50 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 6 Year Warranty
1620.001022.54
50 Gallons
GCG-50
In Stock
Qty:
AO Smith ProMax Series - XCG Water Heaters

Natural Gas

Residential Water Heater

Standard Vent

81 Gallons
Retail : $1,838.00 $1,160.15

You Save (37%)
AO Smith 100191296 GCG-50 Proline 50 Gallon Tall Residential Natural Gas Water Heater - Atmospheric Vent - 10 Year Warranty
1838.001160.15
50 Gallons
XCG-50
In Stock
Qty:
Lochinvar Power-Fin Series - Water Heaters

Natural Gas

Copper-Finned Tube Heat Exchanger

Standard Vent

85% Efficiency

5 Year Warranty
Retail : $20,594.00 $16,199.24

You Save (21%)
Lochinvar PFN0502PMM9 Power-Fin 500 Input MBtu Commercial Natural Gas Water Heater - Direct Vent - 5 Year Warranty
20594.0016199.24
500 MBtu
PFN-0502PM-M9
In Stock
Qty:
Lochinvar Armor Series - Water Heaters

Natural Gas

Stainless Steel Heat Exchanger

Condensing Water Heater

Direct Vent

98% Efficiency

5 Year Warranty
Retail : $16,329.00 $11,559.30

You Save (29%)
Lochinvar AWN151PM Armor 150 Input MBtu - 96% AFUE - Commercial Condensing Natural Gas Water Heater - Direct Vent - 5 Year Warranty
10733.008028.28
150 MBtu
AWN151PM

Lochinvar AWN200PM Armor 199 Input MBtu - 96% AFUE - Commercial Condensing Natural Gas Water Heater - Direct Vent - 5 Year Warranty
11268.007976.62
199 MBtu
AWN200PM

Lochinvar AWN286PM Armor 285 Input MBtu - 96% AFUE - Commercial Condensing Natural Gas Water Heater - Direct Vent - 5 Year Warranty
16329.0011559.30
285 MBtu
AWN286PM
In Stock
Qty:
AO Smith ProLine Series - GDV Water Heaters

Natural Gas

Residential Water Heater

Direct Vent

91 Gallons

6 Year Warranty
Retail : $4,406.00 $2,781.07

You Save (37%)
AO Smith GDV-40 Proline 40 Gallon Residential Natural Gas Water Heater - Direct Vent - 6 Year Warranty
4014.002533.64
40 Gallons
64 Gallons
GDV-40

AO Smith 100210251 GDV-50 Proline 50 Gallon Residential Natural Gas Water Heater - Direct Vent - 6 Year Warranty
4406.002781.07
50 Gallons
91 Gallons
100210251
In Stock
Qty:
AO Smith ProLine Series - GPVT Side Connect Water Heaters

Natural Gas

Residential Water Heater

Power Vent

83 Gallons

6 Year Warranty
Retail : $3,250.00 $2,051.40

You Save (37%)
AO Smith 100114729 GPVT-40 Proline 40 Gallon Residential Natural Gas Water Heater - Power Vent - 6 Year Warranty
2866.001809.02
40 Gallons
93 Gallons
100114729
In Stock

AO Smith 100114769 GPVT-50 Proline 50 Gallon Residential Natural Gas Water Heater - Power Vent - 6 Year Warranty
3250.002051.40
50 Gallons
83 Gallons
100114769
In Stock
Qty:
AO Smith Burkay Series - Circulating Water Heaters

Natural Gas

Commercial Water Heater

5 Year Warranty
Retail : $5,652.00 $5,086.80

You Save (10%)
AO Smith HW-200M Burkay 199 Input MBtu Commercial Natural Gas Circulating Water Heater - 5 Year Warranty
4952.004456.80
200 MBtu
HW-200M
In Stock

AO Smith HW-225M Burkay 225 Input MBtu Commercial Natural Gas Circulating Water Heater - 5 Year Warranty
5652.005086.80
225 MBtu
HW-225M
In Stock
Qty:
AO Smith Burkay Series - Water Heater

Natural Gas

Commercial Water Heater

5 Year Warranty
Retail : $12,227.00 $11,004.30

You Save (10%)
AO Smith HW-300 Burkay 300 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty
7628.006865.20
300 MBtu
HW-300
In Stock

AO Smith HW-399 Burkay 399 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty
9292.008362.80
399 MBtu
HW-399
In Stock

AO Smith 100123159 HW-420 Burkay 420 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty
9292.008362.80
420 MBtu
HW-420
In Stock

AO Smith HW-520 Burkay 520 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty
10689.009620.10
520 MBtu
HW-520

AO Smith HW-670 Burkay 656 Gallon, 660 Input MBtu Commercial Natural Gas Water Heater - 5 Year Warranty
12227.0011004.30
660 MBtu
HW-670
In Stock
Qty:

Shopping Options

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