Gas Tankless Water Heaters

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Gas tankless water heaters can use either natural gas or liquid propane for their fuel source and be installed either indoors or outdoors. If you are looking for this type of versatility, shop our wide selection of gas tankless water heaters from the top brands and find the perfect match today.
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Model Number RTG-95XLN is the Number 1 Seller
Learn More About Rheem Tankless RTG-95XLN
Rheem Tankless
Rheem RTG - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: RTG-95XLN-1
EnergyStar Non-Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 8.5 GPM at 40° F Rise, 6.6 GPM at 50° F Rise, 5.5 GPM at 60° F Rise, 4.7 GPM at 70° F Rise.
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Model Number NR98-SV-NG is the Number 2 Seller
Learn More About Noritz NR98-SV-NG
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.83 UEF - Gas Tankless Water Heater - Power Vent
Model: NR98-SV-NG
EnergyStar Non-Condensing Water Heater. Ultra Low Nox Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.4 GPM at 40
4% Buy This
(8)
$1,239.00
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Model Number TK-110U-E-N is the Number 3 Seller
Learn More About Takagi TK-110U-E-N
Takagi
Takagi TK-110U - 3.9 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: TK-110U-E-NG
3% Buy This
(25)
$549.00
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Model Number T-H3M-DV-N is the Number 4 Seller
Learn More About Takagi T-H3M-DV-N
Takagi
Takagi T-H3M - 3.8 GPM at 60° F Rise - 0.90 UEF - Gas Tankless Water Heater - Direct Vent
Model: T-H3M-DV-NG
3% Buy This
(41)
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$594.15
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Model Number TK-310U-E-N is the Number 5 Seller
Learn More About Takagi TK-310U-E-N
Takagi
Takagi TK-310U - 5.3 GPM at 60° F Rise - 0.82 UEF - Gas Tankless Water Heater - Outdoor
Model: TK-310U-E-NG
3% Buy This
(26)
$729.00
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Learn More About Noritz NR98-OD-NG
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.84 UEF - Gas Tankless Water Heater - Outdoor
Model: NR98-OD-NG
11% Buy This
(9)
$1,239.00
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Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About Rheem Tankless RTG-84XLN
Rheem Tankless
Rheem RTG - 5.1 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: RTG-84XLN-1
EnergyStar Non-Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 7.8 GPM at 40° F Rise, 6.1 GPM at 50° F Rise, 5.1 GPM at 60° F Rise, 4.3 GPM at 70° F Rise.
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(1)
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$799.00
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Learn More About Takagi T-H3-DV-N
Takagi
Takagi T-H3 - 6.3 GPM at 60° F Rise - 0.93 UEF - Gas Tankless Water Heater - Direct Vent
Model: T-H3-DV-NG
3% Buy This
(40)
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On Sale Ends 03/31
$891.65
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Learn More About Takagi T-H3M-DV-P
Takagi
Takagi T-H3M - 3.8 GPM at 60° F Rise - 0.90 UEF - Propane Tankless Water Heater - Direct Vent
Model: T-H3M-DV-LP
3% Buy This
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On Sale Ends 03/31
$594.15
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$699.00
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Learn More About Rheem Tankless RTG-95XLP
Rheem Tankless
Rheem RTG - 5.5 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Outdoor
Model: RTG-95XLP-1
EnergyStar Non-Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 8.5 GPM at 40° F Rise, 6.6 GPM at 50° F Rise, 5.5 GPM at 60° F Rise, 4.7 GPM at 70° F Rise.
3% Buy This
(1)
View All Gas Tankless Water Heaters on Sale
On Sale Ends 03/31
$863.10
Was 
$959.00
SAVE $95.90
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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 may apply, see our full shipping policy for more details.
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Learn More About Rheem Tankless RTG-84DVLN
Rheem Tankless
Rheem RTG - 5.1 GPM at 60° F Rise - 0.82 UEF - Gas Tankless Water Heater - Concentric Vent
Model: RTG-84DVLN-1
EnergyStar Non-Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 7.8 GPM at 40° F Rise, 6.1 GPM at 50° F Rise, 5.1 GPM at 60° F Rise, 4.3 GPM at 70° F Rise.
2% Buy This
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On Sale Ends 03/31
$719.10
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$799.00
SAVE $79.90
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Learn More About Takagi T-H3J-DV-P
Takagi
Takagi T-H3J - 5.0 GPM at 60° F Rise - 0.94 UEF - Propane Tankless Water Heater - Direct Vent
Model: T-H3J-DV-LP
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). 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.
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$721.65
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$849.00
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Learn More About Rinnai V53DEP
Rinnai
Rinnai Value Series - V53 - 3.3 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Outdoor
Model: V53DEP
EnergyStar Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 4.9 GPM at 40
1% Buy This
(5)
$555.60
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Learn More About Takagi TK-310U-I-N
Takagi
Takagi TK-310U - 5.3 GPM at 60° F Rise - 0.82 UEF - Gas Tankless Water Heater - Direct Vent
Model: TK-310U-I-NG
Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.9 GPM at 40° F Rise, 6.2 GPM at 50° F Rise, 5.3 GPM at 60° F Rise, 4.5 GPM at 70° F Rise. 156k Effective BTU/h.
1% Buy This
(28)
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On Sale Ends 03/31
$619.65
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$729.00
SAVE $109.35
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Learn More About Takagi TK-110U-I-N
Takagi
Takagi TK-110U - 3.9 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Direct Vent
Model: TK-110U-I-NG
Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). 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. 115k Effective BTU/h.
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$509.15
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$599.00
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Learn More About Noritz NR662-OD-NG
Noritz NR662 - 3.8 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: NR662OD-NG
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.8 GPM at 40
1% Buy This
(9)
$775.00
Only 4 In-Stock
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Learn More About Noritz NRC98-OD-NG
Noritz NRC98 - 5.6 GPM at 60° F Rise - 0.91 UEF - Gas Tankless Water Heater - Outdoor
Model: NRC98-OD-NG
1% Buy This
(9)
Q&A (1)
$1,289.00
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2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About Noritz NR98-OD-LP
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.88 UEF - Propane Tankless Water Heater - Outdoor
Model: NR98-OD-LP
EnergyStar Non-Condensing Water Heater. Ultra Low Nox Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.4 GPM at 40° F Rise, 6.7 GPM at 50° F Rise, 5.6 GPM at 60° F Rise, 4.8 GPM at 70° F Rise. 199.9k Effective BTU/h.
1% Buy This
(8)
$1,239.00
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2% Check Discount
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2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About Noritz NRC111-OD-NG
Noritz NRC111 - 6.2 GPM at 60° F Rise - 0.91 UEF - Gas Tankless Water Heater - Outdoor
Model: NRC111-OD-NG
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.3 GPM at 40
1% Buy This
(2)
$1,499.00
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2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
2% Check Discount
Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Rheem Tankless RTG-70XLN
Rheem Tankless
Rheem RTG - 4.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: RTG-70XLN-1
EnergyStar Non-Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 6.5 GPM at 40° F Rise, 5.4 GPM at 50° F Rise, 4.5 GPM at 60° F Rise, 3.9 GPM at 70° F Rise.
1% Buy This
(1)
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$629.10
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$699.00
SAVE $69.90
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Learn More About Takagi T-H3-DV-P
Takagi
Takagi T-H3 - 6.3 GPM at 60° F Rise - 0.93 UEF - Propane Tankless Water Heater - Direct Vent
Model: T-H3-DV-LP
1% Buy This
(40)
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On Sale Ends 03/31
$891.65
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SAVE $157.35
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Learn More About Takagi T-H3J-DV-N
Takagi
Takagi T-H3J - 5.0 GPM at 60° F Rise - 0.94 UEF - Gas Tankless Water Heater - Direct Vent
Model: T-H3J-DV-NG
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 6.7 GPM at 40
1% Buy This
(35)
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On Sale Ends 03/31
$721.65
Was 
$849.00
SAVE $127.35
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Learn More About Takagi TK-510U-E-N
Takagi
Takagi TK-510U - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: TK-510U-E-NG
Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.3 GPM at 40° F Rise, 6.9 GPM at 50° F Rise, 5.5 GPM at 60° F Rise, 4.8 GPM at 70° F Rise. 163k Effective BTU/h.
1% Buy This
(25)
$929.00
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Learn More About Takagi T-H3S-DV-N
Takagi
Takagi T-H3S - 5.7 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Direct Vent
Model: T-H3S-DV-NG
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). 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.
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$806.65
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$949.00
SAVE $142.35
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Flow Rate at 40°F Rise
Flow Rate at 50°F Rise
Flow Rate at 60°F Rise
Flow Rate at 70°F Rise