Use the labels as a starting point but measure the actual temperature at the closest hot water faucet if you want to be most precise.
													
																	Water heater temperature control a b c. 
									
	
		
	
																	Here is what temperature each letter stands for. 
																	For the b knob the temperature which has been determined is 140 degrees. 
																	The last c knob setting stands for 150 degrees. 
																	Most hot water heaters have a a b c knob. 
															
													
									
	
		
	
																	Most hot water heaters have a a b c knob. 
																	Check you water heater temperature setting. 
																	If your water heater is now set to 140 f note that you can save 3 to 5 of the energy consumption for each 10 f you lower the temperature. 
																	On your hot water heater there will be a knob on the gas valve or a thermostat if electric behind an electric water heater panel. 
															
													
									
	
		
	
																	Water heater dial a b c. 
																	After programming is com plete the time dial functions only as an on off switch. 
																	The recommended temperature setting is between 115 degrees and 120 degrees. 
																	For the a knob the temperature is 130 degrees. 
															
													
									
	
		
	
																	The recommended temperature setting is between 115 degrees and 120 degrees. 
																	120 degrees is sometimes labeled hot or with a little triangle icon. 
																	In common the a b c knob has different temperature settings. 
																	The a b c knob on a residential gas water heater usually equals 130 140 150 degrees if properly calibrated. 
															
													
									
	
		
	
																	On your hot water heater there will be a knob on the gas valve or a thermostat if electric behind an electric water heater panel.