what is the btu equation
Heat (Btu/hr) = Flow Rate (GPM) x 210 x Temperature Difference (oF) Btu/hr Q = GPM x 210 x rT. Heat In Fresh Water (approx.) Heat (Btu/hr) = Flow Rate (GPM) x 500 x Temperature Difference (oF) Btu/hr Q = GPM x 500 x rT. Heat In 50% Ethylene Glycol and.