Tankless Water Heater Comparison Charts

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Tankless water heaters comparison is about comparing popular gas-powered and on-demand models from North America, and it includes manufacturers such as Rinnai, Takagi, Navien, Noritz, Rheem, Bosch, AO Smith, and Bradford White.


The article will cover the most important info you need when selecting and price comparison, presented in easy-to-understand charts. All water heaters shown here are for residential potable water heating, with and without a condensing technology.

There will be several comparison charts for your convenience and easy find. Reviewed models are powered by the natural gas and are designed for indoor installation, include the direct ignition and the modulating gas burner. The tankless water heater comparison article will not cover outdoor models that are using propane gas as they have similar features/technical data.

What do we compare...

Comparing tankless water heaters designed for smaller homes (up to 2 bathrooms)

Brand
Model		 Gas Input
(Btu)
Min / Max		 Energy
Factor
EF		 Capacity
(gal.)		 Approx.
size
(Inch)		 Weight
(Lb)		 Remote
or
Digital
Control		 Link
cable
AO Smith
ATI-110		 19,500
140,000		 0.82 0.4-6.6 7x14x21 38 Yes No
Bradford White
TG-150I		 15,000
150,000		 0.82 0.6-5 9x14x23 50 Yes No
Bosch
520 PN
520 HN
660 EF		 30,735
117,000		 0.76 0.5 - 5.2 9X18X26 35 No No
30,735
117,000		 0.78 0.6 - 5.2 9X18X26 35 No No
20,000
140,000		 0.82 0.5 - 6.6 7X14X21 36 No No
Noritz
NR66
 20,000
140,000		 0.82 0.5-6.6 7X14X21 36 No No
Rheem
RTG-64		 11,000 150,000 0.82 0.4-6.4 9x14x26 54 Yes Yes
Rinnai
RV53
V65		 15,000 150,000 0.82 0.6-5.3 9x14x24 51 No No
10,300 150,000 0.82 0.4-6.6 9x14x23 46 Yes No
Takagi
T-KJr2		 19,500 140,000 0.82 0.4-6.6 7x14x20 33 Yes No

Tankless water heaters with the energy factor (EF) of 0.82 or higher are Energy Star approved, which is one of the main factors when buying.

Tankless water heaters for 2-3 bath-homes compared

Brand
Model		 Gas Input
(Btu)
Min / Max		 Energy
Factor
EF		 Capacity
(gal.)		 Approx.
size
(Inch)		 Weight
(Lb)		 Remote
or
Digital
Control		 Link
cable
AO Smith
ATI-310		 11,000
190,000		 0.82 0.4-8 9x14x21 43 No No
Bradford White
TG-180I		 15,000
180,000		 0.82 0.6-7.5 9x14x23 50 No No
Bosch
830 ES		 19,900
175,000		 0.83 0.5-8.3 11x18x31 67 Yes Yes
Noritz
NR71
NR83		 25,000
180,000		 0.83 0.5-7.1 7X14X24 41 No No
18,000
180,000		 0.82 0.5-8.3 9X14X21 49 Yes Yes
Rheem
RTG-84		 11,000 180,000 0.82 0.4-8.4 10x14x26 54 Yes Yes
Rinnai
V75
RL75		 10,300 180,000 0.82 0.4-7.5 9x14x23 46 Yes No
10,300 180,000 0.82 0.4-7.5 9x14x23 46 Yes No
Takagi
T-K3
T-K4		 11,000 199,000 0.84 0.5-7 9x14x21 40 Yes No
11,000 190,000 0.82 0.4-8 9x14x21 38 Yes No

Comparison table for tankless water heaters designed for more than 3 bath-homes

Brand
Model		 Gas Input
(Btu)
Min / Max		 Energy
Factor
EF		 Capacity
(gal.)		 Approx.
size
(Inch)		 Weight
(Lb)		 Remote
or
Digital
Control
 Link
cable
AO Smith
ATI-510		 11,000
199,000		 0.82 0.4-10 9x14x21 45 Yes Yes
Bradford White
TG-199I		 15,000
199,000		 0.82 0.6-9.4 9x14x23 50 Yes No
Bosch
940 ES		 19,900
199,900		 0.83 0.5-9.4 11x18x31 67 Yes Yes
Noritz
NR981
NR111		 16,000
199,900		 0.82 0.5-9.8 9x14x24 54 Yes Yes
11,000
250,000		 N/A 0.5-11.1 9x18x24 62 Yes Yes
Rheem
RTG-95		 11,000 199,900 0.82 0.4-9.5 10x14x26 54 Yes Yes
Rinnai
RL94		 10,300 199,000 0.82 0.4-9.8 9x14x23 46 Yes No
Takagi
T-D2		 11,000 190,000 0.83 0.4-10 9x14x20 39 Yes Yes


Condensing tankless models compared

When comparing condensing and non-condensing tankless water heaters, you will see that the main difference is that condensing models utilize the second, stainless steel heat exchanger, which uses the flue heat for the ultra-efficient water heating.

Brand
Model		 Gas Input
(Btu)
Min / Max		 Energy
Factor
EF		 Capac
(gal.)		 Approx.
size
(Inch)		 Weight
(Lb)		 Remote
or
Digital
Control		 Link
cable
AO Smith
ATI-520H		 13,000
199,000		 0.91 0.4-9 12x19x26 73 Yes Yes
Bradford
White
TGHE-160I
TGHE-199I		 9,500
157,000		 0.96 0.26-8 10x19x26 64 Yes ?
9,500
199,000		 0.94 0.26-9.8 10x19x26 71 Yes ?
Bosch
C 950 ES
C 1050 ES
C1210 ES		 19,900
199,000		 0.92 0.5-9.2 11x18x31 74 Yes Yes
19,900
175,000		 0.94 0.5-10.5 11x18x31 74 Yes Yes
25,000
225,000		 N/A 0.5-12.1 11x18x31 88 Yes Yes
Navien
NR180
NR210
NR240
 15,000
150,000		 0.94 0.5-8 14x17x28 67 Yes Yes
17,000
180,000		 0.94 0.5-9.6 15x17x28 77 Yes Yes
20,000
199,000		 0.95 0.5-10.6 15x17x28 77 Yes Yes
Noritz
NRC83
NRC98
NRC111
 16,000
157,000		 0.92 0.5-8.3 9x18x24 58 Yes Yes
16,000
180,000		 0.92 0.5-9.8 9x18x24 58 Yes Yes
11,000
199,900		 0.92 0.5-11.1 9x18x24 66 Yes Yes
Rheem
RTGH 84
RTGH 95
 11,000 157,000 0.94 0.4-8.4 10x19x28 ~60 Yes Yes
11,000 199,900 0.84 0.4-9.5 10x19x28 ~60 Yes Yes
Rinnai
RU80
RU98		 15,200 152,000 0.96 0.4-8 10x18x26 71 Yes No
15,200 199,000 0.95 0.4-9.8 10x18x26 62 Yes No
Takagi
T-H2
T-H2S
T-H3J		 13,000 199,000 0.91 0.4-9 12x19x26 73 Yes No
13,000 180,000 0.91 0.4-8 12x19x26 73 Yes No
15,000 160,000 0.95 0.4-6.6 11x18x23 58 Yes No

Price comparison

Brand / Model (indoor) Price ($)
Approximate
AO Smith
8 GPM (non-condensing)
9 GPM (condensing)
 886
1463
Bosch
8.3 GPM (non-condensing)
9.2 GPM (condensing)
 990
1269
Noritz
7.5 GPM (non-condensing)
9.3 GPM (condensing)		 1124
1818
Navien
9.6 GPM (condensing)		 1362
Rheem
8.4 GPM (non-condensing)
9.5 GPM (condensing)
 857
1313
Rinnai
7.5 GPM (non-condensing)
9.8 GPM (condensing)
 1000
1621
Takagi
8 GPM (non-condensing)
9 GPM (condensing)
 852
1395

See the reviews and prices on Amazon.com.

The above tankless water heater comparison chart contains the information you might need when selecting the right model. If you require more details about specific brand or model, we recommended our reviews found in the links provided on the main navigation bar on the left or below, in the popular articles section.


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