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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