TanklessWaters.com conducts extensive reviews and comparisons on
tankless water heaters from: Bosch, Rheem, Rinnai, Takagi and
Noritz. Our purpose is offer independent opinions and provide
expertise for selecting a tankless unit. Please do not hesitate to
contact our expert tankless water heater specialists via
online product request.
| Brand |
Model |
Input (Btu) |
Efficiency |
Flow Rate (@ 55°F rise) |
Vent Type |
Vent Size |
User Interface Included |
Ignition System |
Heat Exchanger Warranty |
| Bosch |
1000P |
40,000 |
80% |
1.2 GPM |
Natural |
4” |
Yes |
Pilot |
12 years |
| 1600P |
117,000 |
82% |
3.3 GPM |
Natural |
5” |
Yes |
Pilot |
12 years |
| 125BS |
117,000 |
82% |
3.3 GPM |
Natural |
5” |
Yes |
Pilot |
12 years |
| 1600H |
117,000 |
82% |
3.3 GPM |
Natural |
5” |
Yes |
Hydro |
12 years |
| 125FX |
130,000 |
82% |
3.6 GPM |
Forced |
4” |
Yes |
Electronic |
12 years |
| 2400E |
175,000 |
87% |
6.3 GPM |
Indoor
Outdoor |
3” |
Yes |
Electronic |
12 years |
|
2700ES |
200,000 |
87% |
7.2 GPM |
Indoor
Outdoor |
3" |
Yes |
Electronic |
12 years |
| |
|
|
|
|
|
|
|
|
|
| Rheem |
RTG-53 Indoor |
145,000 |
82% |
5.3GPM |
Forced |
3" |
Yes |
Electronic |
10 years |
| RTG-53X Outdoor |
145,000 |
82% |
5.3GPM |
Forced |
N/A |
Yes |
Electronic |
10 years |
| RTG-74DV Indoor |
199,000 |
82% |
7.4GPM |
Forced |
4" |
Yes |
Electronic |
10 years |
| RTG-74X Outdoor |
199,000 |
82% |
7.4GPM |
Direct (Room Sealed) |
4" |
Yes |
Electronic |
10 years |
| RTG-199DV Commercial |
199,000 |
82% |
7.4GPM |
Direct (Room Sealed) |
N/A |
Yes |
Electronic |
10 years |
GT-
199X Commercial |
199,000 |
82% |
7.4GPM |
Forced |
4" |
Yes |
Electronic |
10 years |
| |
|
|
|
|
|
|
|
|
|
| Rinnai |
2532W |
199,000 |
84% |
5.8 GPM |
Forced |
4” |
No |
Electronic |
10 years |
| 2532FFU |
180,000 |
82% |
5.5 GPM |
Direct |
4” |
No |
Electronic |
10 years |
| |
|
|
|
|
|
|
|
|
|
|
Takagi |
T-K Jr. |
140,000 |
83% |
4.2 GPM |
Forced |
4” |
No |
Electronic |
7 years |
| T-K2 |
185,000 |
85% |
5.7 GPM |
Forced |
4” |
No |
Electronic |
7 years |
| T-KD20 |
185,000 |
85% |
5.7 |
Direct |
4” |
No |
Electronic |
7 years |
| T-K1S |
190,000 |
83% |
5.7 GPM |
Forced |
4” |
No |
Electronic |
7 years |
| |
|
|
|
|
|
|
|
|
|
| Noritz |
N-063S |
194,000 |
84% |
5.6 GPM |
Forced |
4” |
Yes |
Electronic |
10 years |
Buying Guide For Tankless Water Heaters