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.
Takagi - Save 10% On Tankless Water Heaters
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Model Number TK-110U-I-N is the Number 1 Seller
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.
4% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(27)
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On Sale Ends 11/24
$544.50
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Model Number V53DEP is the Number 2 Seller
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
4% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(5)
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$555.60
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Model Number T-H3J-DV-P is the Number 3 Seller
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.
3% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(36)
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On Sale Ends 11/24
$810.00
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$900.00
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Model Number T-H3M-DV-P is the Number 4 Seller
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
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(33)
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$749.00
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Model Number TK-310U-I-N is the Number 5 Seller
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.
3% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(28)
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On Sale Ends 11/24
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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
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.
3% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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On Sale Ends 12/01
$1,103.08
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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
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(38)
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$1,150.00
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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 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.
3% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(31)
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On Sale Ends 11/24
$881.10
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$979.00
SAVE $97.90
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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
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(26)
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On Sale Ends 11/24
$684.00
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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
2% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(39)
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On Sale Ends 11/24
$1,035.00
Was 
$1,150.00
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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 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
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.
2% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(32)
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On Sale Ends 11/24
$963.00
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$1,070.00
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Learn More About Noritz EZ111DV-NG
Noritz EZ111 - 6.5 GPM at 60° F Rise - 0.97 UEF - Gas Tankless Water Heater - Direct Vent
Model: EZ111DV-NG
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.8 GPM at 40
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(3)
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$1,549.00
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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 Takagi T-H3S-DV-P
Takagi
Takagi T-H3S - 5.7 GPM at 60° F Rise - 0.95 UEF - Propane Tankless Water Heater - Direct Vent
Model: T-H3S-DV-LP
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(29)
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On Sale Ends 11/24
$881.10
Was 
$979.00
SAVE $97.90
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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
2% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(24)
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On Sale Ends 11/24
$544.50
Was 
$605.00
SAVE $60.50
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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 Noritz NR98-SV-LP
Noritz NR98 - 5.6 GPM at 60° F Rise - 0.88 UEF - Propane Tankless Water Heater - Power Vent
Model: NR98-SV-LP
EnergyStar Non-Condensing Water Heater. Ultra Low Nox Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.4 GPM at 40
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
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On Sale Ends 12/01
$1,103.08
Was 
$1,199.00
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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 NRCP982-DV-NG
Noritz NRCP982 - 5.8 GPM at 60° F Rise - 0.94 UEF - Gas Tankless Water Heater - Direct Vent
Model: NRCP982-DV-NG
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(6)
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Model NRCP982-DV-NG is a Closeout
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$1,199.00
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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 NRC111-DV-NG
Noritz NRC111 - 6.2 GPM at 60° F Rise - 0.90 UEF - Gas Tankless Water Heater - Direct Vent
Model: NRC111-DV-NG
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.3 GPM at 40° F Rise, 7.4 GPM at 50° F Rise, 6.2 GPM at 60° F Rise, 5.3 GPM at 70° F Rise. 184k Effective BTU/h.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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On Sale Ends 12/01
$1,277.88
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$1,389.00
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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 RTGH-95DVLN
Rheem Tankless
Rheem RTGH - 6.4 GPM at 60° F Rise - 0.93 UEF - Gas Tankless Water Heater - Direct Vent
Model: RTGH-95DVLN-2
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD rule 1146.2 Compliant). Ratings: 9.5 GPM at 40° F Rise, 7.7 GPM at 50° F Rise, 6.4 GPM at 60° F Rise, 5.5 GPM at 70° F Rise.
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(7)
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$1,149.00
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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 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
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(3)
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$1,299.00
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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 NRC111-DV-LP
Noritz NRC111 - 6.2 GPM at 60° F Rise - 0.90 UEF - Propane Tankless Water Heater - Direct Vent
Model: NRC111-DV-LP
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.3 GPM at 40
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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On Sale Ends 12/01
$1,277.88
Was 
$1,389.00
SAVE $111.12
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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 Takagi TK-510U-I-N
Takagi
Takagi TK-510U - 5.5 GPM at 60° F Rise - 0.82 UEF - Gas Tankless Water Heater - Direct Vent
Model: TK-510U-I-NG
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(27)
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On Sale Ends 11/24
$850.50
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$945.00
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Learn More About Noritz NRC98-DV-LP
Noritz NRC98 - 5.6 GPM at 60° F Rise - 0.92 UEF - Propane Tankless Water Heater - Direct Vent
Model: NRC98-DV-LP
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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On Sale Ends 12/01
$1,103.08
Was 
$1,199.00
SAVE $95.92
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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 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
1% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(40)
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On Sale Ends 11/24
$674.10
Was 
$749.00
SAVE $74.90
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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 Takagi TK-540P-PIH
Takagi
Takagi TK-540P-PIH - 6.3 GPM at 60° F Rise - 0.93 UEF - Propane Tankless Water Heater - Direct Vent
Model: TK-540P-PIH
1% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(27)
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On Sale Ends 11/24
$1,233.00
Was 
$1,370.00
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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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Flow Rate at 40°F Rise
Flow Rate at 50°F Rise
Flow Rate at 60°F Rise
Flow Rate at 70°F Rise