Reviving this old thread because my heater gave it up.   I understand the advantages of having two heaters, but need clarification on the watts.   I have about 120 gallons of water to heat, so should I buy two heaters rated for around 60 gallons each, so if one fails I still have some heat, and conversely, if one goes full power I don't cook the tank?    
Are you all still happy with the heaters you recommended? 
 
Happy Friday! 
		
	
		
		
		
		
		
	
		
		
	
	
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