However, we can estimate the equivalent power output in horsepower by understanding that 1 BTU per hour is equal to 0.293071 watts. Therefore, 18,000 BTU per hour is equivalent to 18,000 * 0.293071 = 5,273.28 watts.
To convert watts to horsepower, we divide by 746. Hence, 5,273.28 watts is equivalent to 5,273.28 / 746 = 7.05 horsepower (hp).
Therefore, approximately 18,000 BTU is equivalent to 7.05 horsepower.