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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 TK-310U-I-N is the Number 1 Seller
Learn More About 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.
5% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(14)
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On Sale Ends 09/30
$657.00
Was 
$730.00
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Model Number V65IP is the Number 2 Seller
Learn More About V65IP
Rinnai
Rinnai Value Series - V65 - 4.1 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Direct Vent
Model: V65IP
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 6.2 GPM at 40
5% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(13)
Q&A (6)
$624.00
Was 
$1,101.00
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Model Number T-H3-DV-N is the Number 3 Seller
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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
4% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(28)
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On Sale Ends 09/30
$927.00
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$1,030.00
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Model Number TK-310U-E-N is the Number 4 Seller
Learn More About 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
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.
4% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 09/30
$657.00
Was 
$730.00
SAVE $73.00
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Model Number T-H3M-DV-N is the Number 5 Seller
Learn More About 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
EnergyStar Condensing Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 5.4 GPM at 40° F Rise, 4.4 GPM at 50° F Rise, 3.8 GPM at 60° F Rise, 3.2 GPM at 70° F Rise. 112k 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(29)
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On Sale Ends 09/30
$621.00
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$690.00
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Learn More About 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
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.
3% 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 09/30
$944.10
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$1,049.00
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Learn More About RL94IN
Rinnai
Rinnai Luxury Series - RL94 - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Direct Vent
Model: RL94IN
EnergyStar Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 8.2 GPM at 40° F Rise, 6.5 GPM at 50° F Rise, 5.5 GPM at 60° F Rise, 4.7 GPM at 70° F Rise. 163k Effective BTU/h.
3% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(8)
Q&A (1)
Model RL94IN includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,371.00
In-Stock
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Learn More About RL94EP
Rinnai
Rinnai Luxury Series - RL94 - 5.5 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Outdoor
Model: RL94EP
3% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(8)
Q&A (1)
Model RL94EP includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,371.00
In-Stock
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Learn More About 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
3% 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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$1,299.00
Only 3 In-Stock
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Learn More About RL94EN
Rinnai
Rinnai Luxury Series - RL94 - 5.5 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: RL94EN
2% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(8)
Q&A (1)
Model RL94EN includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,371.00
In-Stock
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Learn More About RL94IP
Rinnai
Rinnai Luxury Series - RL94 - 5.5 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Direct Vent
Model: RL94IP
2% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(9)
Q&A (1)
Model RL94IP includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,371.00
In-Stock
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Learn More About NR501-OD-LP
Noritz NR501 - 3.3 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Outdoor
Model: NR501OD-LP
EnergyStar Water Heater. Ratings: 5.0 GPM at 40° F Rise, 3.9 GPM at 50° F Rise, 3.3 GPM at 60° F Rise, 2.8 GPM at 70° F Rise. 102k 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(7)
Q&A (2)
$559.00
Only 4 In-Stock
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Learn More About T9800 SE 199
Bosch Greentherm - 6.7 GPM at 60° F Rise - 0.96 UEF - Gas Tankless Water Heater - Direct Vent
Model: T9800 SE 199
EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 10.0 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(2)
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$1,219.00
Only 4 In-Stock
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Learn More About 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.
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(14)
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On Sale Ends 09/30
$544.50
Was 
$605.00
SAVE $60.50
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Learn More About V65IN
Rinnai
Rinnai Value Series - V65 - 4.1 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Direct Vent
Model: V65IN
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 6.2 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(13)
Q&A (6)
$624.00
Was 
$1,101.00
SAVE $477.00
In-Stock
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Learn More About V65EP
Rinnai
Rinnai Value Series - V65 - 4.1 GPM at 60° F Rise - 0.81 UEF - Propane Tankless Water Heater - Outdoor
Model: V65EP
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 6.2 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(10)
Q&A (3)
$605.00
Was 
$1,023.00
SAVE $418.00
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Learn More About RL75IN
Rinnai
Rinnai Luxury Series - RL75 - 5.0 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Direct Vent
Model: RL75IN
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.4 GPM at 40
2% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(8)
Q&A (1)
Model RL75IN includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,127.25
In-Stock
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2% Check Discount
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Add To Cart
Learn More About 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.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(7)
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$1,199.00
Only 1 In-Stock
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2% Check Discount
Learn More About 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 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.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(22)
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On Sale Ends 09/30
$837.00
Was 
$930.00
SAVE $93.00
In-Stock
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Learn More About 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
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
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(14)
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View All Gas Tankless Water Heaters on Sale
On Sale Ends 09/30
$814.50
Was 
$905.00
SAVE $90.50
In-Stock
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Learn More About 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
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 09/30
$814.50
Was 
$905.00
SAVE $90.50
In-Stock
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Add To Cart
Learn More About NR501-OD-NG
Noritz NR501 - 3.3 GPM at 60° F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor
Model: NR501OD-NG
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.0 GPM at 40° F Rise, 3.9 GPM at 50° F Rise, 3.3 GPM at 60° F Rise, 2.8 GPM at 70° F Rise. 103k Effective BTU/h.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
Q&A (1)
$559.00
Only 1 In-Stock
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Add To Cart
Learn More About RL75EP
Rinnai
Rinnai Luxury Series - RL75 - 5.0 GPM at 60° F Rise - 0.80 UEF - Propane Tankless Water Heater - Outdoor
Model: RL75EP
EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.4 GPM at 40
1% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(8)
Q&A (1)
Model RL75EP includes Additional $100 Off w/ Mail-In Rebate
Additional $100 Off w/ Mail-In Rebate
$1,127.25
In-Stock
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2% Check Discount
Learn More About 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 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
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(28)
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On Sale Ends 09/30
$751.50
Was 
$835.00
SAVE $83.50
In-Stock
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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

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