I was thinking the same thing on the WOW! On my current set up about 300g of water I have one 150 watt heater. I do also have three submersed pumps that must add more heat then I thought. 200g of that water is in my basement that is also chilly. 
 
Dave 
		
	
		
		
		
		
		
	
		
		
	
	
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