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 Hypothetically, how many S9s would it take to heat a hot tub? 
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 9  
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 1 if you use a bucket as tub 
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 5000w runs an electric water heater, 1300w per S9 so on paper it'd take three šŸ‘€ 
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 Watts are watts. Take the wattage of your existing hot tub heater divide it by the wattage of the S9 (1323). If I had to guess, I would say 7. 
 If you put a S9 straight in your tub,  you might get fried instantly...
just be careful  
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 What if Iā€™m already fried?