Formula for condensing water heater to gpm output

Fitter30

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Been looking for this for a while
Take a 199 k input heater output is 185k
185k ÷ 8.3 = 22289.15
22289 ÷ 60 ( minutes in a hour) = 371.48
Then ÷ by temp rise
371.48 ÷ 80 = 4.6 gpm
 
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