Natural Gas Tankless Water Heaters

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Learn More About Rinnai V65IN
Rinnai
Rinnai Value Series - V65 - 4.1 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Concentric Vent
Model: V65IN
Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 6.2 GPM at 40
9% Buy This
(18)
Q&A (6)
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$681.73
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$757.48
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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
9% Buy This
(25)
$675.00
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Learn More About Noritz EZTR40-NG
Noritz
Noritz EZTR40 - 3.7 GPM at 60° F Rise - 0.89 UEF - Gas Tankless Water Heater - Direct Vent (Bundle Pack)
Model: EZTR40NG
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.5 GPM at 40
6% Buy This
(6)
$1,542.41
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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 A.O. Smith ATI-540HX3-N
A.O. Smith
A.O. Smith X3 - 6.2 GPM at 60° F Rise - 0.93 UEF - Gas Tankless Water Heater - Indoor
Model: ATI-540HX3-N
EnergyStar Condensing Water Heater. Ultra-Low NOx (14 ng/J or 20 ppm). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.2 GPM at 60° F Rise, 5.2 GPM at 70° F Rise. 199k Max BTU/h.
5% Buy This
(1)
$1,558.00
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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 Noritz NR501-OD-NG
Noritz
Noritz NR501 - 3.3 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: NR501OD-NG
4% Buy This
(9)
Q&A (1)
$644.48
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Learn More About Noritz NR98-DVC-NG
Noritz
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.83 UEF - Gas Tankless Water Heater - Concentric Vent
Model: NR98-DVC-NG
EnergyStar Non-Condensing Water Heater. Ultra Low Nox Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.4 GPM at 40
4% Buy This
(9)
$1,444.96
Only 3 In-Stock
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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 A.O. Smith ATO-540H-N
A.O. Smith
A.O. Smith ATO-540H - 6.3 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Outdoor
Model: ATO-540H-N
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 9.5 GPM at 40° F Rise, 7.5 GPM at 50° F Rise, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 189k Effective BTU/h.
4% Buy This
(1)
$1,269.00
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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 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
3% Buy This
(29)
$936.00
Only 2 In-Stock
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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
(28)
$936.00
Only 4 In-Stock
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Learn More About Noritz NR662-OD-NG
Noritz
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
3% Buy This
(10)
$899.56
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Learn More About Takagi T-H3-OS-N
Takagi
Takagi T-H3 - 6.3 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Outdoor
Model: T-H3-OS-NG
3% Buy This
(32)
$1,269.00
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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 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
3% Buy This
(28)
$728.00
In-Stock
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Learn More About Noritz NRC661-DV-NG
Noritz
Noritz NRC661 - 3.8 GPM at 60° F Rise - 0.89 UEF - Gas Tankless Water Heater - Direct Vent
Model: NRC661DV-NG
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.8 GPM at 40° F Rise, 4.6 GPM at 50° F Rise, 3.8 GPM at 60° F Rise, 3.3 GPM at 70° F Rise. 109k Effective BTU/h.
3% Buy This
(8)
$1,052.69
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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 Bosch Thermotechnology T9800 SE 160
Bosch Greentherm - 5.4 GPM at 60° F Rise - 0.97 UEF - Gas Tankless Water Heater - Direct Vent
Model: T9800 SE 160
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.0 GPM at 40
3% Buy This
(3)
$1,534.00
Factory-Direct
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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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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 A.O. Smith ATI-340H-N
A.O. Smith
A.O. Smith ATI-340H - 5.7 GPM at 60° F Rise - 0.95 UEF - Gas Tankless Water Heater - Direct Vent
Model: ATI-340H-N
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.
2% Buy This
(10)
$1,142.00
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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 Noritz NR98-OD-NG
Noritz
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.84 UEF - Gas Tankless Water Heater - Outdoor
Model: NR98-OD-NG
2% Buy This
(9)
Q&A (2)
$1,530.00
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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 Noritz NR98-SV-NG
Noritz
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
2% Buy This
(9)
$1,444.96
In-Stock
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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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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 NRC661-OD-NG
Noritz
Noritz NRC661 - 3.8 GPM at 60° F Rise - 0.89 UEF - Gas Tankless Water Heater - Outdoor
Model: NRC661OD-NG
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.8 GPM at 40° F Rise, 4.6 GPM at 50° F Rise, 3.8 GPM at 60° F Rise, 3.3 GPM at 70° F Rise. 109k Effective BTU/h.
2% Buy This
(9)
$1,052.69
In-Stock
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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 Bosch Thermotechnology T9900 SE 199
Bosch T9900 SE 199 - 6.8 GPM at 60° F Rise - 0.96 UEF - Gas Tankless Water Heater - Direct Vent
Model: T9900 SE 199
2% Buy This
(8)
$2,120.00
Factory-Direct
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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 Noritz NR83DVC-NG
Noritz
Noritz NR83 - 5.0 GPM at 60° F Rise - 0.85 UEF - Gas Tankless Water Heater - Concentric Vent
Model: NR83DVC
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Concentric Vent. Ratings: 7.6 GPM at 40
2% Buy This
(7)
$1,253.23
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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 Rinnai RL94IN
Rinnai
Rinnai Luxury Series - RL94 - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Concentric Vent
Model: RL94IN
1% Buy This
(8)
Q&A (1)
$1,525.61
Only 4 In-Stock
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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 Rinnai RU180EN
Rinnai
Rinnai Sensei™ - RU180 - 5.8 GPM at 60° F Rise - 0.92 UEF - Gas Tankless Water Heater - Outdoor
Model: RU180EN
1% Buy This
(6)
$1,702.10
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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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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 Rinnai RU199EN
Rinnai
Rinnai Sensei™ - RU199 - 6.4 GPM at 60° F Rise - 0.92 UEF - Gas Tankless Water Heater - Outdoor
Model: RU199EN
1% Buy This
(6)
$1,854.74
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Learn More About 2% Check Discount
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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 Bosch Thermotechnology T9800 SEO 160
Bosch Greentherm - 5.4 GPM at 60° F Rise - 0.97 UEF - Gas Tankless Water Heater - Outdoor
Model: T9800 SEO 160
EnergyStar Condensing Water Heater. Low NOx Emissions. Ratings: 8.0 GPM at 40
1% Buy This
(3)
$1,496.00
Factory-Direct
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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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Tools & Articles
Tankless Water Heater Buying Guide
How to Pick the Perfect Tankless Water Heater
Tankless Water Heater Sizing Guide
What Size Tankless Water Heater Do I Need
Natural gas tankless water heaters are compact, can supply hot water as long as needed, and require less energy to run than other systems. Depending on the model, natural gas tankless water heaters are also available as indoor or outdoor units, offering the homeowner more flexibility.
Flow Rate at 40°F Rise
Flow Rate at 50°F Rise
Flow Rate at 60°F Rise
Flow Rate at 70°F Rise