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
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

• How does a tankless water heater work?
• What factors to consider when purchasing a tankless water heater?
• What factors to consider when purchasing a gas tankless unit?
• What factors to consider when purchasing an electric tankless water heater?
• Tankless water heater recommendations
• Online tankless water heater consultant - helping you select the right unit
• Bosch tankless water heaters