Natural Gas Tankless Water Heater Comparisons
for 1 Bathroom (3-4 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-42	Bosch (125FX)	Bosch 1600H (125HX)	Bosch 1600P (125B)
	More Info	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.	4.2 GPM/ 1.5 Major Applications	4.6 GPM/ 1.5 Major Applications	4.3 GPM/ 1.5 Major Applications	4.3 GPM/ 1.5 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.	3.2 GPM/ 1 Major Application	3.5 GPM/ 1.5 Major Applications	3.2 GPM/ 1 Major Application	3.2 GPM/ 1 Major Application
Price	$623	$649	$599	$499
Comments
Energy Efficiency	0.83	0.78	0.78	0.69
BTUs	118,000	125,000	117,000	117,000
Temperature Range	100F - 140F	100F - 140F	100F - 140F	100F - 140F
Ignition	Electronic	Electronic	Hydro	Standing Pilot
Exhaust Venting	Vertical or Horizontal	Horizontal	Vertical	Vertical
Limited Warranty(2)	10 yrs	12 yrs	12 yrs	12 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