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AO Smith (31)
Bosch (4)
Bradford White (8)
Eccotemp (6)
EZ Tankless (7)
Noritz (24)
Rheem (13)
Rinnai (24)
Takagi (14)

Fuel Type

Natural Gas (126)
Propane (25)

BTU (Max)

70,000 (1)
80,000 (3)
84,000 (1)
100,000 (1)
120,000 (7)
130,000 (2)
140,000 (12)
157,000 (3)
160,000 (16)
165,000 (1)

Energy Factor

0.80 - 0.85 (39)
0.85 - 0.90 (5)
0.90 - 0.95 (49)
0.95+ (46)

Vent Type

Concentric (17)
Concentric Direct-Vent Termination (3)
Direct Exhaust (2)
Direct Vent (60)
Outdoor (No Venting) (19)
Power Direct Vent (6)
Power Vent (9)

Installation Type

Indoor Only (67)
Indoor/Outdoor (20)
Outdoor Only (40)

Flow Rate At 40F Temp Rise (GPM)

4.9 (1)
5.0 (1)
5.4 (2)
5.5 (1)
5.8 (5)
6 (1)
6.3 (1)
6.6 (2)
6.7 (1)
7.1 (2)

Flow Rate At 50F Temp Rise (GPM)

3.9 (2)
4.4 (3)
4.5 (2)
4.6 (3)
4.8 (1)
5.1 (1)
5.3 (2)
5.8 (2)
6.1 (2)
6.2 (5)

Flow Rate At 60F Temp Rise (GPM)

3.3 (2)
3.7 (1)
3.8 (5)
3.9 (2)
4 (1)
4.2 (1)
4.4 (2)
4.9 (2)
5 (2)
5.2 (2)

Flow Rate At 70F Temp Rise (GPM)

2.8 (2)
3.2 (3)
3.3 (5)
3.5 (1)
3.6 (1)
3.8 (3)
4.2 (2)
4.3 (1)
4.4 (1)
4.5 (4)

Review Score

(35)
(9)
(1)
(2)

Price Range

$40 to $45 (1)
$300 to $400 (1)
$400 to $500 (2)
$500 to $600 (4)
$600 to $700 (3)
$700 to $800 (6)
$800 to $900 (6)
$900 to $1000 (12)
$1000 to $1500 (29)
$1500 to $2000 (38)

Tankless Natural Gas Water Heaters

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Product Image of Therm 830 ES NG Whole House Tankless Water Heater, Input 175 MBH
$2,131.11 each
In Stock
Get 1 by Tue, Aug 25 - Thu, Aug 27
In Stock
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Product Image of High Efficiency 8.4 GPM Indoor Non-Condensing Tankless Water Heater (NG), RTG-84DVLN-3
$1,002.73 each
In Stock
Get 289 by Thu, Aug 27
In Stock
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Product Image of 199,000 BTU ATM-199X3 Adapt SC Standard Condensing Ultra-Low NOx Tankless Water Heater with X3 Scale Prevention Technology (NG)
$1,968.83 each
In Stock
Get 3 by Tue, Aug 25 - Thu, Aug 27
In Stock
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Product Image of TCT-199I-N 199,000 BTU High Commercial Indoor Condensing Ultra-Low NOx Tankless Water Heater (NG)
$1,933.19 each
Out of Stock
Get it by Wed, Sep 9 - Fri, Sep 18
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Product Image of SmartHome 80,000 BTU Indoor Tankless Water Heater (4 GPM, NG)
$449.00 each
In Stock
Get 20 by Wed, Aug 26 - Thu, Aug 27
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Product Image of RE140e 140,000 BTU, Non-Condensing Outdoor Tankless Water Heater (Natural Gas)
$913.03 each
In Stock
Get 257 by Wed, Aug 26
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Product Image of RTG-S-199-N1 INFINITI GS-Series Indoor Tankless Condensing Water Heater, 9.7 GPM (Natural Gas)
$1,475.00 each
In Stock
Get 2 by Wed, Aug 26 - Fri, Aug 28
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Product Image of RTG-R-199-N1 INFINITI GR-Series Indoor Tankless Condensing Water Heater, 9.7 GPM (Natural Gas)
$1,704.13 each
In Stock
Get 3 by Wed, Aug 26 - Fri, Aug 28
In Stock
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Product Image of NCC199CDV Pro 199,900 BTU Indoor/Outdoor Direct Vent Commercial Tankless Water Heater (NG/LP)
$2,958.42 each
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of Builder Series Outdoor Tankless Water Heater (6.8 GPM, NG)
$599.00 each
In Stock
Get 80 by Wed, Aug 26 - Thu, Aug 27
In Stock
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Product Image of Greentherm T 9800 SE 199 NG Tankless Water Heater
Greentherm T 9800 SE 199 NG Tankless Water Heater
SKU: 7736503581
Bosch
SKU: 7736503581
Brand: Bosch
$2,429.37 each
In Stock
Get 2 by Tue, Aug 25 - Thu, Aug 27
In Stock
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Product Image of 180,000 BTU ATM-180X3 Adapt SC Standard Condensing Ultra-Low NOx Tankless Water Heater with X3 Scale Prevention Technology (NG)
$1,787.50 each
In Stock
Get 1 by Tue, Aug 25 - Thu, Aug 27
In Stock
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Product Image of NRC98OD 180,000 BTU Outdoor Vent Condensing Residential Tankless Water Heater (NG)
$1,825.94 each
In Stock
Get 1 by Wed, Aug 26
In Stock
Get 1 by Wed, Aug 26
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Product Image of 199,000 BTU ATO-510 Non-Condensing Ultra-Low NOx Outdoor Tankless Water Heater (NG/LP)
$1,589.49 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of 199,000 BTU ACT-199I Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
$2,246.71 each
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of RTG-K-160-N1 INFINITI K Indoor Tankless Condensing Water Heater, 7 GPM (Natural Gas)
$1,758.45 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of EZ 202 Portable Tankless Water Heater (NG)
$354.00 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of 199,000 BTU ATI-540P Condensing Ultra-Low NOx Indoor Tankless Water Heater w/ Integrated Recirc. Pump (NG)
$1,813.08 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of 160,000 BTU ATM-160X3 Adapt SC Standard Condensing Ultra-Low NOx Tankless Water Heater with X3 Scale Prevention Technology (NG)
$1,668.75 each
In Stock
Get 1 by Tue, Aug 25 - Thu, Aug 27
In Stock
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Product Image of 199,000 BTU ATO-540P Condensing Ultra-Low NOx Outdoor Tankless Water Heater w/ Integrated Recirc. Pump (NG)
$1,716.65 each
In Stock
Get 1 by Wed, Aug 26
In Stock
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Product Image of 597,000 BTU Commercial Indoor Tankless Rack System - Wall Mount (NG)
$9,738.57 each
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Product Image of 140,000 BTU ATO-110 Non-Condensing Ultra-Low NOx Outdoor Tankless Water Heater (NG/LP)
$924.50 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of SmartHome 80,000 BTU Indoor Tankless Water Heater (4.5 GPM, NG)
$499.00 each
Out of Stock
Get it by Tue, Sep 8 - Tue, Sep 15
Out of Stock
Get it by Tue, Sep 8 - Tue, Sep 15
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Product Image of EZTR50 180,000 BTU Multi Vent Condensing Tankless Water Heater Bundle Pack (NG)
$2,387.81 each
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Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of RTG-L-199-N1 INFINITI L-Series Indoor Tankless Condensing Water Heater, 8.7 GPM (Natural Gas)
$1,919.15 each
In Stock
Get 1 by Wed, Aug 26 - Fri, Aug 28
In Stock
Get 1 by Wed, Aug 26 - Fri, Aug 28
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Product Image of NC199OD 199,900 BTU Outdoor Commercial Tankless Water Heater (NG)
$1,749.34 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of 199,000 BTU ATI-510C Non-Condensing Ultra-Low NOx Indoor Tankless Water Heater (NG)
$1,381.68 each
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Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of RTG-K-199-N2 INFINITI K Outdoor Tankless Condensing Water Heater, 8.7 GPM (Natural Gas)
$2,062.95 each
In Stock
Get 2 by Tue, Aug 25 - Thu, Aug 27
In Stock
Get 2 by Tue, Aug 25 - Thu, Aug 27
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Product Image of 199,000 BTU ACT-199O Condensing Ultra-Low NOx Outdoor Tankless Water Heater (NG)
$1,960.43 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of Greentherm T 9900 SE 199 NG Tankless Water Heater
Greentherm T 9900 SE 199 NG Tankless Water Heater
SKU: 7736503731
Bosch
SKU: 7736503731
Brand: Bosch
$3,243.22 each
In Stock
Get 1 by Thu, Aug 27 - Tue, Sep 1
In Stock
Get 1 by Thu, Aug 27 - Tue, Sep 1
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Product Image of CXP160IN 160,000 BTU Commercial Condensing Indoor Tankless Water Heater w/ Integrated Pump (Natural Gas)
$1,787.10 each
In Stock
Get 6 by Wed, Aug 26
In Stock
Get 6 by Wed, Aug 26
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Product Image of SmartHome 140,000 BTU Indoor Tankless Water Heater w/ Voice Commands (6.8 GPM, NG)
$699.00 each
In Stock
Get 200 by Wed, Aug 26 - Thu, Aug 27
In Stock
Get 200 by Wed, Aug 26 - Thu, Aug 27
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Product Image of 398,000 BTU Commercial Indoor Tankless Rack System - Free-Standing Back-to-Back (NG)
$8,856.96 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of ACI-CRS-24IL-N 398,000 BTU Commercial Indoor Tankless Rack System - Free-Standing In-Line (NG)
$8,856.96 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of RTGH Super High Efficiency 8.4 GPM Indoor Condensing Tankless Water Heater (Natural Gas), RTGH-84DVLN-3
$1,470.18 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of 160,000 BTU Ultra Low-NOx w/X3 Technology Natural Gas Outdoor Condensing Tankless Water Heater (6.6 GPM)
$1,689.57 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of T-H3S-OS-N Outdoor Tankless High Efficiency Condensing Water Heater (NG)
$942.96 each
In Stock
Get 2 by Fri, Aug 28
In Stock
Get 2 by Fri, Aug 28
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Product Image of ACI-CRS-26IL-N 398,000 BTU Commercial Indoor Tankless Rack System - Free-Standing In-Line (NG)
$8,856.96 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of TK-510C-NI Indoor Tankless Non-Condensing Concentric Vent Water Heater, 199,000 BTU
$1,459.36 each
In Stock
Get 2 by Wed, Aug 26
In Stock
Get 2 by Wed, Aug 26
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Product Image of EZ Supreme on Demand Tankless Water Heater, 3-4 Bath w/ Direct Vent Kit (NG)
$896.04 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of High Efficiency 9.5 GPM Indoor Wi-Fi LeakGuard Detection Non-Condensing Tankless Water Heater (NG), RTG-95DVELN-3
$2,080.88 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of ACO-CRS-22WM-N 398,000 BTU Commercial Outdoor Tankless Rack System - Wall Mount (NG)
$6,066.13 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of NRC111OD 199,900 BTU Outdoor Condensing Vent Residential Tankless Water Heater (NG)
$1,779.85 each
Backorder
Get it by Tue, Sep 22 - Tue, Oct 20
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Get it by Tue, Sep 22 - Tue, Oct 20
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Product Image of EZ98DV 180,000 BTU Indoor/Outdoor Residential Tankless Water Heater (NG)
$1,753.08 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of ACO-CRS-23WM-N 398,000 BTU Commercial Outdoor Tankless Rack System - Wall Mount (NG)
$6,489.72 each
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Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of ACI-CRS-22WM-N 398,000 BTU Commercial Indoor Tankless Rack System - Wall Mount (NG)
$6,066.13 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23
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Product Image of 199,000 BTU Ultra Low-NOx Natural Gas Outdoor Condensing Tankless Water Heater (10 GPM)
$1,452.83 each
In Stock
Get 2 by Tue, Aug 25
In Stock
Get 2 by Tue, Aug 25
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Product Image of EZTR75 199,000 BTU Multi Vent Condensing Tankless Water Heater Bundle Pack (NG)
$2,509.32 each
Backorder
Get it by Wed, Sep 23 - Fri, Oct 23
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Get it by Wed, Sep 23 - Fri, Oct 23