Natural Gas Tankless Water Heater Comparisons
for 1-2 Bathrooms (4.0-5.5 GPM)

Compare natural gas tankless water heaters for large and small homes from Bosch and Rheem. Note: use a 45 degree rise for Southern states and the 60 degree rise requirements for colder climates in the Midwest and Northern states.

Model	Rheem RTG-74	Bosch 2400E (250SX)	Rheem RTG-53
	More Info	More Info	More Info
@ 45 degree temp rise (For warm climates)/ Major Applications  ?Approximate hot water output for customers in southern climates with avg. incoming water temperatures of 60 degrees or higher.	7.4 GPM/ 3 Major Applications	6.35 GPM/ 2.5 Major Applications	5.3 GPM/ 2 Major Applications
@ 60 degree temp rise (For Northern States)/ Major Applications  ?Approximate hot water output for customers in northern climates with avg. incoming water temperatures of 50 degrees or less.	5.5 GPM/ 2 Major Applications	5 GPM/ 2 Major Applications	3.9 GPM/ 1.5 Major Applications
Price	$860	$998	$659
Comments	Best High Capacity
Energy Efficiency	0.82	0.85	0.82
BTUs	199,900	175,000	145,000
Temperature Range	100F -180F (GT199)	100F - 140F	100F - 140F
Ignition	Electronic	Electronic	Electronic
Exhaust Venting	Vertical or Horizontal	Vertical or Horizontal	Vertical or Horizontal
Limited Warranty(2)	10 yrs	12 yrs	10 yrs

Buying Guide For Tankless Water Heaters

• Gas Venting Requirements
• Gas Line Sizing Requirements
• Gas Combustion Air Requirements
• Online tankless water heater consultant - helping you select the right unit