Answer
$5.86\times10^{3}\,W$
Work Step by Step
20000 Btu/h =
$\frac{20000\,Btu}{h}\times\frac{1055.06\,J}{1\,Btu}\times\frac{1\,h}{3600\,s}=5.86\times10^{3}\,J/s$ $=5.86\times10^{3}\,W$
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