Natural Gas Tankless Water Heaters

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Uniform Energy Factor Learn More
Uniform Energy Factor
Uniform Energy Factor (UEF) is a measurement of water heater energy efficiency. The higher the energy factor, the more efficient the water heater.
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Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
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Flow Rate at 40F Temperature Rise (GPM) Learn More
Flow Rate at 40F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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Flow Rate at 50F Temperature Rise (GPM) Learn More
Flow Rate at 50F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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Flow Rate at 60F Temperature Rise (GPM) Learn More
Flow Rate at 60F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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Flow Rate at 70F Temperature Rise (GPM) Learn More
Flow Rate at 70F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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Maximum Input Capacity (BTU) Learn More
Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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EnergyStar Condensing Water Heater. Ultra-Low NOx (14 ng/J or 20 ppm). Ratings: 6.7 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. 160k Max BTU/h.
Item#: 157489
Brand: A.O. Smith
Originally $1,453.00$1,089.75
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EnergyStar 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. 180k Effective BTU/h.
Item#: 31860
Model#: NRC98-DV-NG
Brand: Noritz
Sale: $1,393.51
On Sale Through 02/28
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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 map apply, see our full shipping policy for more details.
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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. 199k Effective BTU/h.
Item#: 59261
Model#: NR98-SV-NG
Brand: Noritz
Sale: $1,372.71
On Sale Through 02/28
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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 map apply, see our full shipping policy for more details.
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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. 199k Effective BTU/h.
Item#: 59260
Model#: NR98-OD-NG
Brand: Noritz
Sale: $1,372.71
On Sale Through 02/28
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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 map apply, see our full shipping policy for more details.
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EnergyStar Condensing Water Heater. Ultra-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. 199k Effective BTU/h.
Item#: 70551
Model#: T-H3-DV-N
Brand: Takagi
$1,200.95
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EnergyStar Commercial Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.3 GPM at 40& deg; F Rise, 7.4 GPM at 50° F Rise, 6.2 GPM at 60° F Rise, 5.3 GPM at 70° F Rise. 199k Effective BTU/h.
Item#: 82311
Model#: NCC199CDV-NG
Brand: Noritz
$2,421.60
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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.
Item#: 59262
Model#: NRC111-DV-NG
Brand: Noritz
Sale: $1,579.76
On Sale Through 02/28
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EnergyStar Condensing Water Heater. Ultra-Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 5.8 GPM at 40° F Rise, 3.9 GPM at 50° F Rise, 3.9 GPM at 60° F Rise, 3.3 GPM at 70° F Rise. 140k Effective BTU/h.
Item#: 70562
Model#: TK-110U-I-N
Brand: Takagi
$695.95
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EnergyStar Condensing Water Heater. Ultra-Low NOx (14 ng/J or 20 ppm). 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. 190k Max BTU/h.
Item#: 70564
Model#: TK-310U-I-N
Brand: Takagi
$910.95
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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. 199k Effective BTU/h.
Item#: 59259
Model#: NR98-DVC-NG
Brand: Noritz
Sale: $1,372.71
On Sale Through 02/28
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EnergyStar Condensing Water Heater. Ultra-Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: 5.8 GPM at 40° F Rise, 3.9 GPM at 50° F Rise, 3.9 GPM at 60° F Rise, 3.3 GPM at 70° F Rise. 140k Effective BTU/h.
Item#: 70561
Model#: TK-110U-E-N
Brand: Takagi
$640.95
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EnergyStar Condensing Water Heater. Ultra-Low NOx (14 ng/J or 20 ppm). 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. 199k Max BTU/h.
Item#: 70573
Model#: TK-510U-I-N
Brand: Takagi
$1,055.95
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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.
Item#: 31852
Model#: NRC661DV-NG
Brand: Noritz
Sale: $989.06
On Sale Through 02/28
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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, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 199k Max BTU/h.
Item#: 61571
Model#: ATI-540H-N
Brand: A.O. Smith
$1,269.00
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EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 5.5 GPM at 40° F Rise, 4.4 GPM at 50° F Rise, 3.7 GPM at 60° F Rise, 3.2 GPM at 70° F Rise. 120k Effective BTU/h.
Item#: 70845
Model#: EZTR40NG
Brand: Noritz
Sale: $1,386.78
On Sale Through 02/28
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Wall Mounted, Condensing Water Heater Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Concentric Vent. Ratings: 7.5 GPM at 40° F Rise, 5.9 GPM at 50° F Rise, 4.8 GPM at 60° F Rise, 4.2 GPM at 70° F Rise. 160k Effective BTU/h.
Item#: 77047
Model#: RUCS75IN
Brand: Rinnai
$849.00
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EnergyStar Commercial 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.
Item#: 82305
Model#: NC199OD-NG
Brand: Noritz
$1,667.00
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EnergyStar 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. 180k Effective BTU/h.
Item#: 31861
Model#: NRC98-OD-NG
Brand: Noritz
Sale: $1,393.51
On Sale Through 02/28
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Commercial Water Heater. Low NOx Emissions (< 40 ng/J or 55 PPM). Ratings: GPM at 40° F Rise, GPM at 50° F Rise, GPM at 60° F Rise, 8.9 GPM at 70° F Rise. 304k Effective BTU/h.
Item#: 31838
Brand: Noritz
$4,887.00
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EnergyStar Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 7.1 GPM at 40° F Rise, 5.8 GPM at 50° F Rise, 4.9 GPM at 60° F Rise, 4.2 GPM at 70° F Rise. 157k Effective BTU/h.
Item#: 31856
Model#: NRC711DV-NG
Brand: Noritz
Sale: $1,230.84
On Sale Through 02/28
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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. 120k Effective BTU/h.
Item#: 32016
Model#: NR501OD-NG
Brand: Noritz
Sale: $612.26
On Sale Through 02/28
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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.
Item#: 61570
Model#: ATI-340H-N
Brand: A.O. Smith
$1,142.00
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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, 6.3 GPM at 60° F Rise, 5.4 GPM at 70° F Rise. 199k Max BTU/h.
Item#: 76482
Model#: ATI-540P-N
Brand: A.O. Smith
$1,501.00
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EnergyStar Commercial Condensing Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 13.2 GPM at 40& deg; F Rise, 11.6 GPM at 50° F Rise, 9.7 GPM at 60° F Rise, 8.3 GPM at 70° F Rise. 300k Effective BTU/h.
Item#: 82307
Model#: NCC300DV-NG
Brand: Noritz
$4,969.03
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