Tankless Water Heaters

Select Product Type

Shop by Brand

Shop by Fuel Type

Shop by Application

Shop by Feature

Shop by Brand

Shop by Fuel Type

Shop by Application

Shop by Feature

Filter By

Best Selling▼

Best Selling
Price: Low to High
Price: High to Low
Name: A-Z
Name: Z-A
Recommends Only
Closeouts Only
In-stock Only
Next Day Air Only
Availability

Filters

Brand

Rinnai (48)

A.O. Smith (42)

Takagi (40)

State Water Heaters (12)

Rheem Tankless (33)

Noritz (63)

Eemax (49)

GE Appliances (8)

Bosch Thermotechnology (6)

+ Show More

Fuel Type

To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.

Electric (57)

Liquid Propane (115)

Natural Gas (129)

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.

120000 - 139999 (27)

140000 - 159999 (17)

160000 - 179999 (37)

180000 - 199999 (149)

300000 - 319999 (4)

380000+ (10)

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.

0.80 (2)

0.81 (35)

0.82 (12)

0.83 (2)

0.84 (1)

0.85 (1)

0.88 (3)

0.89 (10)

0.90 (12)

0.91 (22)

0.92 (13)

0.93 (38)

0.94 (30)

0.95 (38)

0.96 (22)

0.97 (19)

0.98 (7)

0.99 (1)

+ Show 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.

Concentric Vent (15)

Direct Vent (120)

Outdoor (No Venting) (105)

Power Vent (4)

Combustion Type

Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.

Condensing (171)

Non-Condensing (73)

Installation Location

Indoor (131)

Indoor / Outdoor (22)

Outdoor (109)

Under Sink (39)

Product Line

AccuMix (1)

AccuMix II (7)

AutoBooster (1)

Classic Plus (12)

Commercial (19)

ecoTough (14)

FlowCo (13)

Greentherm (6)

HomeAdvantage II (7)

LavAdvantage (19)

Luxury Series (8)

Prestige (21)

ProLine XE (36)

ProTough (4)

Residential (29)

Sensei (25)

Three Phase (1)

Ultra Series (4)

Value Series (11)

valueSolutions (4)

+ Show More

Gas Conversion Kit

Included (18)

Not Available (218)

Voltage (Volts)

120 (206)

208 (6)

240 (27)

277 (14)

480 (1)

Ultra Low NOx Emissions

NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More

No (6)

Yes (223)

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. Learn More

1 (39)

2 - 3 (7)

4 - 5 (26)

6 - 7 (78)

8 - 9 (125)

10 - 11 (2)

12 - 13 (4)

14 - 15 (8)

+ Show 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. Learn More

0 (25)

1 (19)

2 (2)

3 (6)

4 (27)

5 (18)

6 (120)

7 (58)

8 (2)

11 (4)

12 (8)

+ Show 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. Learn More

0 (34)

1 (10)

2 (3)

3 (29)

4 (21)

5 (122)

6 (60)

9 (4)

10 (8)

+ Show 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. Learn More

0 (37)

1 (6)

2 (7)

3 (37)

4 (127)

5 (61)

8 (14)

+ Show More

Includes Pump

No (219)

Yes (30)

Price

100 - 299 (37)

300 - 499 (7)

500 - 699 (21)

700 - 899 (26)

900 - 1099 (36)

1100 - 1299 (50)

1300 - 1499 (28)

1500 - 1699 (43)

1700 - 1899 (24)

1900 - 2099 (8)

2100 - 2299 (5)

2300 - 2499 (2)

3500 - 3699 (8)

4500+ (6)

+ Show More

AFUE (%)

AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More

80 - 81 (3)

82 - 83 (3)

84 - 85 (2)

88 - 89 (2)

96 - 97 (3)

98 - 99 (5)

Energy Factor

Energy Factor (EF) is a measurement of water heater energy efficiency. The higher the energy factor, the more efficient the water heater. Learn More

0.82 (1)

0.99 (8)

1 (1)

Thermal Efficiency (%)

80 (2)

84 (3)

85 (2)

97 (4)

98 (1)

Efficiency (%)

99 (2)

A.O. Smith ATO-140H - 3.8 GPM at 60° F Rise - 0.91 UEF - Gas Tankless Water Heater - Outdoor

Model: ATO-140H-N

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.

Write A Review

$845.00

Factory-Direct

Free Shipping

*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.

View Details

Compare

A.O. Smith ATO-240H - 5.0 GPM at 60° F Rise - 0.95 UEF - Propane Tankless Water Heater - Outdoor

Model: ATO-240H-P

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. 171k Effective BTU/h.

Write A Review

$1,022.00

Factory-Direct

Free Shipping

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.

View Details

Compare

A.O. Smith ATO-340H - 5.7 GPM at 60° F Rise - 0.94 UEF - Gas Tankless Water Heater - Outdoor

Model: ATO-340H-N

Write A Review

$1,142.00

Factory-Direct

Free Shipping

2% Check Discount

View Details

Compare

A.O. Smith ATO-510U - 5.5 GPM at 60°F Rise - 0.81 UEF - Gas Tankless Water Heater - Outdoor

Model: ATO-510U-N

EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 8.3 GPM at 40

Write A Review

$1,049.00

Factory-Direct

Free Shipping

2% Check Discount

View Details

Compare

Noritz NR98 - 5.6 GPM at 60° F Rise - 0.88 UEF - Propane Tankless Water Heater - Concentric Vent

Model: NR98-DVC-LP

(7)

$1,417.00

More On The Way

Est. Ship Date Jun 30

Free Shipping

2% Check Discount

View Details

Compare

Noritz NR83 - 5.0 GPM at 60° F Rise - 0.82 UEF - Propane Tankless Water Heater - Concentric Vent

Model: GQ-2457WS-FFA US LP

EnergyStar Water Heater. Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Concentric Vent. Ratings: 7.6 GPM at 40

(7)

$1,229.00

Backordered

Est. Ship Date Jul 29

Free Shipping

2% Check Discount

View Details

Compare

Learn More About Noritz NC380-SV-ASME-LP

Noritz NC380-SV-ASME - 8.9 GPM at 70° F Rise - 80% TE - Propane Tankless Water Heater - Power Vent or Outdoor - ASME Certified

Model: NC380-SV-ASME-LP

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.

(2)

$4,525.00

Backordered

Est. Ship Date Jul 14

Free Shipping & Lift Gate

2% Check Discount

View Details

Compare

Noritz NRCR111 - 6.5 GPM at 60° F Rise - 0.97 UEF - Propane Tankless Water Heater - Direct Vent

Model: NRCR111-DV-LP

Ultra Low NOx Emissions (SCAQMD Rule 1146.2 Compliant). Ratings: 9.7 GPM at 40° F Rise, 7.8 GPM at 50° F Rise, 6.5 GPM at 60° F Rise, 5.5 GPM at 70° F Rise.

(2)

$1,961.00

Backordered

Est. Ship Date Jul 04

Free Shipping & Lift Gate

2% Check Discount

View Details

Compare

Takagi T-H3 - 6.3 GPM at 60° F Rise - 0.93 UEF - Propane Tankless Water Heater - Direct Vent

Model: T-H3-DV-LP

(41)

$1,269.00

Out of Stock

Free Shipping

2% Check Discount

View Details

Compare

Eemax MT010 - 1.1 GPM at 60° F Rise - 0.99 UEF - 240V / 1 Ph Tankless Point of Use Water Heater

Model: MT010240T

Ratings: 1.6 GPM at 40Â°F Rise, 1.3 GPM at 50Â°F Rise, 0.9 GPM at 70Â°F Rise

Write A Review

Sold Out

Compare

PREVIOUSPREV

1 ...13

Displaying Products 289 - 301 (of 301)

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

There's no need to rush through your shower anymore! Get endless hot water on demand with a tankless water heater. Tankless hot water heaters heat water as you call for it, ensuring you never run out while saving both space and energy.